Baseboard, Crown Molding and Trim Calculator (Linear Feet and Pieces)

Choose the trim and how to enter the length, then enter the room size (or perimeter) and the stock length. For baseboard, enter the width and number of openings with no baseboard, such as doors and patio doors, one kind per row (leave unused rows blank).

Units

Trim type

How to enter the length

Room length (m)

Room width (m)

Openings with no baseboard (doors, patio doors)

Width unit

Row Width Count

Stock length (m)

Waste factor (%)

Inside and outside corners (optional)

Allowance per corner (cm)

Price ($, optional)

Pieces you have (optional)

Enter lengths in meters and opening widths in the unit chosen on the right. A blank waste factor counts as 5%, a blank opening count as 1 and a blank number of corners as 0. The price and the pieces you have can be left blank.

Result and figure

Enter the room size (or perimeter), the openings and the stock length on the left and press "Calculate". The result and a floor plan will appear here.

[ CLOSE ]

What you can do on this page
What is this calculation used for?
How to Use
Formulas and figures
Symbols and terms
- Symbols
- Terms
Good to know before you start
How to calculate it in Excel
How to calculate it in Google Sheets
How to calculate it in Python
How to write it in LaTeX and other math languages (copy and paste)
How to have ChatGPT do the calculation
DataChef Features
Related Features
NumberChef Calculators List

What you can do on this page

Enter the room length and width (or the perimeter) and the width of openings with no baseboard, such as doors and patio doors, and see right away the length of baseboard you need (with waste) and how many stock pieces to buy, with the leftover
Choose "Baseboard (at the floor, minus openings)", "Crown molding (at the ceiling, no openings)" or "Transition strip / trim (any length)", so it works for any trim you buy by length
See the count from "length needed ÷ stock length" next to the practical count that assigns stock pieces wall by wall to cut down on seams (rounded up per wall). A floor plan shows the gaps for openings and the pieces on each wall in color
Add an allowance for miter cuts from the number of inside and outside corners. Enter a price ($ per piece or per foot) for a cost estimate, or the pieces you already have to see how much they cover and how many more to buy
A plain-language explanation of the formulas and copy-and-paste formulas for Excel, Google Sheets and Python are on this page too

The room is treated as a rectangle. To work out the perimeter itself (together with wall and ceiling area), use the wall, ceiling and floor area page. If each piece has a set length and you want to fit them into stock boards with saw kerf, use the lumber cut list page. Switch "Units" above the calculator to Metric to work in meters.

What is this calculation used for?

Buying and installing new baseboard yourself (DIY remodel)

When you replace the baseboard along with new flooring or paint, this formula tells you how many pieces to buy. For example, a 12 × 10 ft room (perimeter 44 ft) with a 40 in door and a 72 in patio door has a net length of about 34.67 ft. With a 5% waste factor you need 36.4 ft, so with 8 ft stock that is 5 pieces (4.55 before rounding up).
But if you assign stock wall by wall, the two 10 ft walls take 2 pieces each, and the two 12 ft walls (6 ft and about 8.67 ft after subtracting the openings) take 1 and 2, for 7 in total. Buy 7 if you want no seams in the middle of walls, or 5 if you are fine joining offcuts.

Ordering crown molding in stock lengths

Crown molding and other decorative molding are estimated from the perimeter without subtracting openings. For a room with a 44 ft perimeter and 5% waste, you need 46.2 ft: 4 pieces of 12 ft stock (3.85 before rounding up) or 3 pieces of 16 ft stock (2.89).
With short 8 ft stock it is 6 pieces (5.78) and more seams. Assigned wall by wall, 8 ft stock takes 2 + 2 + 2 + 2 = 8 pieces, while 12 ft stock covers each wall in one piece (4 pieces, no seams). So you can compare and choose longer stock when fewer seams matter.

Buying vinyl cove base in rolls

Vinyl cove base is often sold in 120 ft rolls or by the foot, so you buy the length needed rather than pieces. For the 12 × 10 ft room above, you need 36.4 ft, and entering the price per foot gives the cost estimate.
Some cove base can be bent around corners (no miter cuts), so a smaller waste factor (for example 3%) is fine. For 4 ft pieces, enter 4 as the stock length to get the count (10 pieces for 36.4 ft).

Checking the quantities on a contractor's estimate

Contractor estimates often list trim in linear feet, such as "baseboard 40 LF" or "crown 48 LF", and this formula lets you check them against the room perimeter. If a room with a net length of about 34.7 ft (44 ft minus 9.33 ft of openings) shows "baseboard 52 LF", that is a waste factor of about 50%, a good reason to ask why.
On the other hand, an exact "34.7 LF" may leave you short of material. A quantity with 5–10% waste is typical.

Working backward to see if leftover material is enough

If you have three 12 ft pieces of baseboard left from an earlier job, with a 5% waste factor they cover a net length of 3 × 12 ÷ 1.05 ≈ 34.29 ft. A room with a 44 ft perimeter minus a 40 in door (about 40.67 ft) is about 6.38 ft short, so you need to buy one more piece.
Enter the pieces you have to see the length they cover and the shortfall, which helps you decide what to buy.

Estimating from a floor plan in feet and inches

Even before you can measure, a floor plan gives a rough estimate. A bedroom marked 12' 6" × 10' 3" is 12.5 ft × 10.25 ft (divide the inches by 12), for a perimeter of 45.5 ft.
Plans often show dimensions to the center of the walls, so inside dimensions are a little smaller. Confirm the final quantities by measuring the room once you can.

Formulas and figures

Room perimeter (total wall length)

Figure

Standard notation (the usual math form)

$P$ $=$ $2$ $\times$ $($ $L$ $+$ $W$ $)$

In words (symbols replaced with words)

③ $P$: perimeter $=$ $2$ $\times$ $($ ① $L$: room length $+$ ② $W$: room width $)$

The formula in words

① Add the $L$: room length

② and the $W$: room width and double it (there are two walls of each length)

③ and you get the $P$: perimeter

Quick example

The perimeter of a 12 × 10 ft bedroom is

perimeter $P$ $=$ $2$ $\times$ $($ length (12 ft) $+$ width (10 ft) $)$

$2 \times (12 + 10) = 2 \times 22 = 44\,\mathrm{ft}$

Key idea

Baseboard and crown molding both run all the way around the room along the walls. So the starting point for the length you need is not the area but the distance around the room, the perimeter. As in the figure, opposite walls of a rectangular room are the same length, so adding the length and the width and doubling it gives the total of all four walls. Measure the inside dimensions (wall surface to wall surface). For an L-shaped room, a hallway or any shape that is not a rectangle, measure each wall, add them up and enter the total with "Perimeter entered directly". If you also want the wall and ceiling area, the wall, ceiling and floor area page is a good place to start.

Total width of openings (subtracted for baseboard only)

Standard notation (the usual math form)

$D$ $=$ $\sum$ $($ $w_i$ $\times$ $n_i$ $)$

In words (symbols replaced with words)

④ $D$: total opening width $=$ ③ $\sum$ $($ ① $w_i$: opening width $\times$ ② $n_i$: number of that width $)$

The formula in words

① Multiply each $w_i$: opening width

② by the $n_i$: number of that width to get the total for that kind,

③ add them up for every row you entered ($\sum$ stands for "add them all up")

④ and you get the $D$: total opening width

Quick example

In a room with one door (40 in including casing) and one patio door (72 in), the total width with no baseboard is

total opening width $D$ $=$ door width (40 in) $\times$ count (1) $+$ patio door width (72 in) $\times$ count (1)

$40 \times 1 + 72 \times 1 = 112\,\mathrm{in} = 112 \div 12 \approx 9.33\,\mathrm{ft}$

Key idea

Baseboard runs along the bottom of the wall at the floor, so it does not go across openings that reach the floor, such as doors, sliding doors, patio doors and closet doors. The perimeter minus their widths is the net length that gets baseboard. The subscript $i$ is the row number (row 1, row 2 …), and if you have two doors of the same width, enter 2 as $n_i$ instead of using two rows. Widths are usually measured in inches, so convert to feet for the calculation (40 in ÷ 12 ≈ 3.33 ft). Subtract the width from the outside of the door casing to the outside of the casing, because the baseboard stops at the casing (about 40 in for a 36 in door). Windows above the floor are not subtracted. Crown molding runs where the wall meets the ceiling, and few openings reach the ceiling, so this calculator does not subtract openings for crown molding or transition strips. (If a tall door or a full-height closet door reaches the ceiling, enter the perimeter minus its width with "Perimeter entered directly".) Also subtract spots where kitchen cabinets or built-ins sit against the wall, since they get no baseboard either.

Corner allowance (extra for each miter cut)

Standard notation (the usual math form)

$C$ $=$ $n_c$ $\times$ $c$

In words (symbols replaced with words)

③ $C$: corner allowance $=$ ① $n_c$: number of corners $\times$ ② $c$: allowance per corner

The formula in words

① Multiply the $n_c$: number of inside and outside corners

② by the $c$: allowance per corner

③ and you get the $C$: corner allowance

Quick example

Adding 2 in for each of the 4 inside corners of a rectangular room gives

corner allowance $C$ $=$ corners (4) $\times$ per corner (2 in)

$4 \times 2 = 8\,\mathrm{in} = 8 \div 12 \approx 0.67\,\mathrm{ft}$

Key idea

At the corners of a room, baseboard and crown molding are cut at 45° and joined (a miter cut; inside corners are often coped instead). At an outside corner (one that sticks out), the tip runs longer than the wall by the trim's thickness, and inside corners also tend to need recuts and fine adjustments. So some people estimate by adding a couple of inches per corner. In this calculator, leaving the number of corners blank adds nothing, and only the waste factor in the next formula covers the extra. If you enter both the corner allowance and a waste factor, the estimate grows by both.

Length needed (with waste)

Standard notation (the usual math form)

$Q$ $=$ $($ $P$ $-$ $D$ $+$ $C$ $)$ $\times$ $($ $1$ $+$ $r$ $)$

In words (symbols replaced with words)

⑤ $Q$: length needed $=$ $($ ① $P$: perimeter $-$ ② $D$: total opening width $+$ ③ $C$: corner allowance $)$ $\times$ $($ $1$ $+$ ④ $r$: waste factor $)$

The formula in words

① From the $P$: perimeter

② subtract the $D$: total opening width (for baseboard),

③ add the $C$: corner allowance to get the net length,

④ then multiply by 1 + $r$: waste factor

⑤ and you get the $Q$: length needed

Quick example

For a room with a 44 ft perimeter and one door (40 in), with no corner allowance and a 5% (0.05) waste factor, the baseboard needed is

length needed $Q$ $=$ $($ perimeter (44 ft) $-$ door (40 in ≈ 3.33 ft) $)$ $\times$ $($ $1$ $+$ waste (0.05) $)$

$(44 - 3.333) \times 1.05 = 40.667 \times 1.05 = 42.7\,\mathrm{ft}$

Key idea

The exact net length is not enough material. Miter cuts at corners, joints, mistakes and cutting around dents or warped sections all use extra. This extra, as a share, is the waste factor $r$. For long, narrow trim like baseboard and crown molding, 5–10% is common (less than for wallpaper or flooring, which you buy by area, but more for rooms with many corners and joints). Use it as "1 + waste factor": 1.05 times for 5%, 1.1 times for 10%. The waste factor is a share, so the extra grows with the perimeter. The corner allowance $C$ in the previous formula is a fixed length, "a couple of inches per corner". Some people estimate with one of them and some add both. In this calculator, leave the number of corners blank to use the waste factor only.

Stock pieces and leftover

Figure

Standard notation (the usual math form)

$N$ $=$ $\lceil$ $Q$ $\div$ $S$ $\rceil$

$R$ $=$ $N$ $\times$ $S$ $-$ $Q$

In words (symbols replaced with words)

④ $N$: stock pieces $=$ $\lceil$ ① $Q$: length needed $\div$ ② $S$: stock length ③ $\rceil$

⑤ $R$: leftover $=$ $N$: stock pieces $\times$ $S$: stock length $-$ $Q$: length needed

The formula in words

① Divide the $Q$: length needed

② by the $S$: stock length

③ and round up to a whole number if it does not divide evenly ($\lceil\ \rceil$ stands for "round up")

④ to get the $N$: stock pieces

⑤ The $R$: leftover is "pieces × stock length" minus the length needed

Quick example

Covering 42.7 ft of baseboard with 12 ft stock takes

stock pieces $N$ $=$ $\lceil$ length needed (42.7 ft) $\div$ stock (12 ft) $\rceil$

$42.7 \div 12 \approx 3.558 \ \rightarrow\ 4$

$R = 4 \times 12 - 42.7 = 5.3\,\mathrm{ft}$

Key idea

The stock length is the fixed length a piece of trim is sold in. If the length needed ÷ stock length is 3.558 pieces, 3 pieces are not enough, so you buy 4. That is rounding up, the same idea as counting rolls, cans or bags. It helps to look at the value before rounding (3.558) too: it tells you whether you almost fit in 3 pieces or have plenty of room with 4. As in the figure, when you lay the stock pieces end to end, the part that runs past the length needed is the leftover $R$. This count treats the whole length needed as one long piece divided by the stock length, so it is the smallest possible count. In real work you cut the stock wall by wall, so assigning pieces to each wall (next formula) can take more.

Pieces assigned wall by wall (the practical count with fewer seams)

Figure

Standard notation (the usual math form)

$N_w$ $=$ $\sum$ $\lceil$ $\ell_i$ $\div$ $S$ $\rceil$

In words (symbols replaced with words)

④ $N_w$: pieces wall by wall $=$ ③ $\sum$ $\lceil$ ① $\ell_i$: net length of wall $i$ $\div$ $S$: stock length ② $\rceil$

The formula in words

① Divide the $\ell_i$: net length of wall $i$ (that wall's length minus any openings on it) by the stock length,

② round up for each wall ($\lceil\ \rceil$ stands for "round up"),

③ add them up for all four walls ($\sum$ stands for "add them all up")

④ and you get the $N_w$: pieces wall by wall

Quick example

In a 12 × 10 ft room with a door (40 in) on one 12 ft wall, assigning 8 ft baseboard wall by wall takes

pieces wall by wall $N_w$ $=$ $\lceil$ wall 1 (10 ft) $\div$ 8 ft $\rceil$ $+$ $\lceil$ wall 2 (12 − 3.33 = 8.67 ft) $\div$ 8 ft $\rceil$ $+$ $\cdots$

$\lceil 10 \div 8 \rceil + \lceil 8.67 \div 8 \rceil + \lceil 10 \div 8 \rceil + \lceil 12 \div 8 \rceil = 2 + 2 + 2 + 2 = 8$

Key idea

The previous formula gives the smallest count, "length needed ÷ stock length". In real work, the trim is mitered and joined at each corner, so one piece cannot wrap around a corner. So in practice you count, wall by wall, how many stock pieces cover that wall, which also keeps seams in the middle of walls to a minimum. In the example above, length needed ÷ stock length is $(44 - 3.33) \times 1.05 \div 8 \approx 5.34$, so 6 pieces, but wall by wall it takes 8, two more. That is because each wall (10 ft and 8.67 ft) is just a little longer than the 8 ft stock and needs a second piece. With 12 ft stock, every wall fits in one piece: 4 pieces and no seams. In the wall-by-wall count, the extra at the end of each wall covers miter cuts and mistakes, so the waste factor and corner allowance are not applied. This calculator shows this count only when you enter the length × width. It places openings widest first on the wall with the most length left to find each wall's net length. If you know where the doors really are, work out each wall's length yourself and use the lumber cut list page to fit the pieces with saw kerf for an even more precise plan.

Estimated cost (price per piece or per foot)

Standard notation (the usual math form)

$T$ $=$ $N$ $\times$ $p$

$T$ $=$ $Q$ $\times$ $p_m$

In words (symbols replaced with words)

③ $T$: estimated cost $=$ ① $N$: stock pieces $\times$ ② $p$: price per piece

$T$: estimated cost $=$ ④ $Q$: length needed $\times$ ⑤ $p_m$: price per foot

The formula in words

① Multiply the $N$: stock pieces

② by the $p$: price per piece

③ and you get the $T$: estimated cost If the trim is sold by length or in rolls and you only know the price per foot, multiply the

④ $Q$: length needed

⑤ by the $p_m$: price per foot

Quick example

If 12 ft baseboard costs $12.50 a piece, 4 pieces cost

estimated cost $T$ $=$ pieces (4) $\times$ price ($12.50 per piece)

$4 \times 12.50 = 50.00$

Key idea

Wood and MDF baseboard and crown molding are usually priced per piece, so multiply the rounded-up piece count by the price. For trim priced per linear foot, such as vinyl cove base in rolls or molding cut to length, multiply the length needed (with waste) by the price per foot. Both are estimates for materials only and do not include corner blocks, adhesive, nails, caulk or labor. Prices vary a lot by store and product, so enter the actual price tag or catalog price. (In this calculator, "$/ft" appears when "Units" is US customary, and "$/m" when it is Metric.)

Length the pieces you have can cover (working backward)

Standard notation (the usual math form)

$Q_h$ $=$ $n_h$ $\times$ $S$ $\div$ $($ $1$ $+$ $r$ $)$

In words (symbols replaced with words)

④ $Q_h$: length covered $=$ ① $n_h$: pieces you have $\times$ ② $S$: stock length $\div$ $($ $1$ $+$ ③ $r$: waste factor $)$

The formula in words

① Multiply the $n_h$: pieces you have

② by the $S$: stock length to get the total length you have,

③ divide it by 1 + $r$: waste factor

④ and you get the $Q_h$: length covered

Quick example

With three 12 ft pieces of baseboard on hand and a 5% waste factor, the net length they cover is

length covered $Q_h$ $=$ pieces (3) $\times$ stock (12 ft) $\div$ $($ $1$ $+$ waste (0.05) $)$

$3 \times 12 \div 1.05 = 36 \div 1.05 \approx 34.29\,\mathrm{ft}$

Key idea

This works backward to answer "is my leftover baseboard enough for this room?". Run the length-needed formula (net length × (1 + waste factor) = length needed) in reverse: divide the total length you have by (1 + waste factor) to get the net length it can cover with waste allowed for (the equivalent of perimeter − openings + corner allowance). In the example above, 3 pieces cover a room whose perimeter minus openings is 34.29 ft or less. The calculator also shows the shortfall, "pieces needed − pieces you have".

Perimeter from feet-and-inches measurements

Standard notation (the usual math form)

$L$ $=$ $L_{ft}$ $+$ $L_{in}$ $\div$ $12$

$W$ $=$ $W_{ft}$ $+$ $W_{in}$ $\div$ $12$

$P$ $=$ $2$ $\times$ $L$ $+$ $2 \times$ $W$

In words (symbols replaced with words)

③ $L$: room length (ft) $=$ ① $L_{ft}$: the feet part $+$ ② $L_{in}$: the inches part $\div$ $12$

⑤ $W$: room width (ft) $=$ $W_{ft}$: the feet part $+$ ④ $W_{in}$: the inches part $\div$ $12$

⑥ $P$: perimeter $=$ $2$ $\times$ $L$: room length $+$ $2 \times$ $W$: room width

The formula in words

① Take the $L_{ft}$: feet part of the length

② and add the $L_{in}$: inches part divided by 12 (12 inches in a foot)

③ to get the $L$: room length in feet

④ Do the same with the $W_{in}$: inches part of the width

⑤ to get the $W$: room width in feet Then, as in the first formula, double the length and the width and add them to get the

⑥ $P$: perimeter

Quick example

For a room measured as 12 ft 6 in × 10 ft 3 in, the perimeter is

perimeter $P$ $=$ $2$ $\times$ length (12 + 6 ÷ 12 = 12.5 ft) $+$ $2 \times$ width (10 + 3 ÷ 12 = 10.25 ft)

$L = 12 + 6 \div 12 = 12.5\,\mathrm{ft},\quad W = 10 + 3 \div 12 = 10.25\,\mathrm{ft}$

$2 \times 12.5 + 2 \times 10.25 = 25 + 20.5 = 45.5\,\mathrm{ft}$

Key idea

US floor plans and tape measures give lengths in feet and inches, such as 12' 6" (12 ft 6 in). The calculator takes feet as a decimal, so divide the inches by 12 and add them to the feet: 6 in is 0.5 ft and 3 in is 0.25 ft. Handy values: 1 in ≈ 0.083 ft, 3 in = 0.25 ft, 4 in ≈ 0.333 ft, 6 in = 0.5 ft, 9 in = 0.75 ft. Once the length and width are in feet, the perimeter works exactly as in the first formula. You can also enter opening widths in inches with the "Width unit" menu, and the calculator converts them to feet for you (40 in ≈ 3.33 ft).

For trim you buy by length, such as baseboard and crown molding, take the room perimeter (2 × (length + width)), subtract the width of openings that get no baseboard to get the net length, multiply by 1 + the waste factor (5–10% is common) to get the length needed, divide by the stock length and round up to get the pieces to buy. In practice, stock is assigned wall by wall to keep seams down, so check that count too (round up for each wall and add) and plan on the larger one.

Symbols and terms

Symbols

$L$	ell	The room length (ft), from "length". Use the inside dimensions (wall surface to wall surface).
$W$	double-u	The room width (ft), from "width". It does not matter which side you call the length and which the width.
$P$	pee	The room perimeter (ft), from "perimeter". For a rectangular room $P = 2(L + W)$; for other shapes it is the total of the wall lengths.
$w_i$	double-u sub i	The width of the opening in row $i$ (ft), from "width". The subscript $i$ is the row number (row 1, row 2 …).
$n_i$	en sub i	The number of openings in row $i$, from "number". It is 2 if you have two doors of the same width.
$\sum$	sigma	The Greek letter sigma (the Greek S), standing for "sum": add them all up. $\sum (w_i \times n_i)$ is "width × count of each row, all added together".
$D$	dee	The total width of openings (ft), from "deduction". It is subtracted from the perimeter for baseboard, and taken as 0 for crown molding and transition strips.
$n_c$	en sub cee	The number of inside and outside corners: n for "number" with c for "corner". A rectangular room has 4 inside corners.
$c$	cee	The allowance per corner, from "corner". In the calculator you enter it in inches, and it is converted to feet (2 in ≈ 0.167 ft).
$C$	capital cee	The corner allowance (ft). $C = n_c \times c$, the length added for the miter cuts at all the corners.
$r$	ar	The waste factor, from "rate". For 5%, $r = 0.05$, and you multiply by $1 + r = 1.05$.
$Q$	cue	The length needed (ft), from "quantity". $Q = (P - D + C)(1 + r)$, the length to buy with waste allowed for.
$S$	ess	The stock length (ft), from "stock" - the length one piece of trim is sold in (8 ft, 12 ft, 16 ft and so on).
$\lceil\ \rceil$	ceiling (round up)	The ceiling function: round the number inside up to a whole number. $\lceil 3.558 \rceil = 4$ and $\lceil 3 \rceil = 3$. It stands for "if it does not divide evenly, buy one more piece".
$N$	en	The number of stock pieces needed, from "number". It is found with $N = \lceil Q \div S \rceil$.
$R$	capital ar	The leftover (ft), from "remainder". $R = N \times S - Q$, the total stock bought minus the length needed.
$\ell_i$	script ell sub i	The net length of wall $i$ (walls 1 to 4, ft): that wall's length minus the openings on it. $\ell$ is a cursive l for "length", used to tell it apart from the room length $L$.
$N_w$	en sub double-u	The number of pieces when stock is assigned wall by wall. The subscript w stands for "wall". It is found with $N_w = \sum \lceil \ell_i \div S \rceil$.
$p$	pee	The price of one stock piece ($ per piece), from "price".
$p_m$	pee sub em	The price per unit of length ($ per ft in US units; the m comes from "meter" in metric). Used for trim sold by length or in rolls.
$T$	tee	The estimated cost ($), from "total". It is found with $T = N \times p$ or $T = Q \times p_m$.
$n_h$	en sub aitch	The number of stock pieces you have: n for "number" with h for "have".
$Q_h$	cue sub aitch	The net length the pieces you have can cover (ft). It is found with $Q_h = n_h \times S \div (1 + r)$.
$L_{ft},\ W_{ft}$	ell sub f t, double-u sub f t	The feet part of a length measured in feet and inches. For 12 ft 6 in, $L_{ft} = 12$.
$L_{in},\ W_{in}$	ell sub i n, double-u sub i n	The inches part of a length measured in feet and inches. For 12 ft 6 in, $L_{in} = 6$. Divide by 12 to change it to feet.
$12$	twelve	The number of inches in a foot (1 ft = 12 in). Dividing inches by 12 gives feet.
$\mathrm{ft},\ \mathrm{in}$	feet, inches	US units of length. Plans write them as 12' 6" (12 ft 6 in). 1 ft = 12 in = 0.3048 m.

Terms

Baseboard	The long, narrow board along the bottom of the wall where it meets the floor (often about 3 to 5 in tall). It protects the wall from vacuum cleaners and feet and hides the gap at the edge of the flooring. It stops at doors and patio doors, so estimate it from "perimeter − opening widths".
Crown molding	The trim where the wall meets the ceiling. It finishes the edges of the wall and ceiling surfaces and hides the gap between them. Openings rarely reach the ceiling, so the room perimeter is the starting point as is.
Transition strip	A narrow strip where two floorings meet (such as hardwood and vinyl) or where a finish changes. Its length to cover is the starting point for the length needed.
Stock length	The fixed length trim and lumber are sold in, such as 8, 12 or 16 ft. Divide the length needed by the stock length and round up to get the pieces to buy.
Perimeter	The distance all the way around a shape. For a room it is the total length of the four walls, 2 × (length + width) for a rectangle.
Opening	Any gap in a wall, such as a door, sliding door, patio door or closet door. This page subtracts the width of openings that reach the floor and get no baseboard.
Inside corner	A corner where two walls meet and point into the room, like the four corners of a room. Baseboard and crown molding are mitered or coped and joined here.
Outside corner	A corner that sticks out, like a column or the end of a wall. A mitered piece runs longer at the tip by the trim's thickness, and corner blocks are sometimes used instead.
Miter cut	Cutting two pieces at 45° each so they meet at a corner. The cut-off ends and recuts after mistakes are part of the waste.
Waste factor	The extra you need beyond the net length, as a share, for miter cuts, joints, mistakes and cutting around damaged sections. 5–10% is common for baseboard and crown molding.
Net length	The length you actually need, with nothing extra. For baseboard it is the perimeter minus the width of the openings, where the baseboard really goes.
Rounding up	Raising a value that does not divide evenly to the next whole number. You cannot buy 3.558 pieces of stock, so you round up to 4.
Seam (joint)	The spot where two pieces are joined partway along a wall. It happens when one stock piece is shorter than the wall. To hide seams, cover each wall with one piece or put the seam where it shows less (a scarf joint is common).
Vinyl cove base	Soft vinyl (or rubber) baseboard, sold in 4 ft pieces or 120 ft rolls and glued to the wall. In rolls you buy the length needed, not pieces, so use a price per foot.
Casing	The trim around a door or window frame. Baseboard stops at the casing, so subtract the opening width from the outside of the casing to the outside of the casing.
MDF	Medium-density fiberboard, a board made of pressed wood fibers. It is widely used for baseboard and crown molding, warps little and is sold in stock lengths like wood (often pre-primed).
Molding	Decorative strips of trim for where walls meet the ceiling, chair height and so on. Crown molding is one kind; estimate it from the perimeter without subtracting openings.
Inside dimensions	Measurements from wall surface to wall surface - the space you can actually use. Estimate baseboard, wallpaper and flooring with these. They are a little smaller than measurements to the center of the walls on some plans.
Patio door	A large glass door that reaches the floor, often sliding (a sliding glass door), leading to a deck, patio or yard. It goes down to the floor, so it gets no baseboard and its width is subtracted. 6 ft (72 in) wide is standard.
Linear foot	A length of 1 ft along the trim, no matter its height or width. Baseboard and trim estimates and prices are often given in linear feet (LF).

Good to know before you start

Here is what helps you use the calculation on this page with real understanding, not just by pressing the button.

Perimeter of a rectangle (Grade 3)	The perimeter of a rectangle is 2 × (length + width), since opposite sides are the same length Perimeter (ft) and area (ft²) are different quantities, and trim you buy by length, like baseboard, uses the perimeter
Converting units of length (Grade 4)	1 ft = 12 in, so 6 in is 0.5 ft and 40 in is about 3.33 ft
Percents (Grade 6)	5% is 0.05, and "5% more" is "1.05 times" Going backward from "$x$ times 1.05 is $y$" gives "$y \div 1.05 = x$"
Rounding up (Grade 4)	Why a value like 3.558 is rounded up to the next whole number, 4 (you buy pieces and boxes by rounding up)
Multiplying and dividing decimals (Grades 5–6)	What calculations like $40.667 \times 1.05$ and $42.7 \div 12$ stand for (a calculator is fine for the arithmetic)
Subtracting the parts you do not cover (Grades 2–3)	Subtracting the parts you do not use, such as door widths, from the total length to find only what you need

How to calculate it in Excel

Copy the whole table below and paste it into cell A1 in Excel. It works as is.

Table to find the room perimeter

Room length (ft)	12
Room width (ft)	10
Perimeter (ft)	=2*(B1+B2)

Table to find the total opening width

Opening 1 width (in)	40
Opening 1 count	1
Opening 2 width (in)	72
Opening 2 count	1
Total opening width (ft)	=(B1B2+B3B4)/12

Table to find the corner allowance

Number of corners	4
Allowance per corner (in)	2
Corner allowance (ft)	=B1*B2/12

Table to find the length needed (with waste)

Perimeter (ft)	44
Total opening width (ft)	=40/12
Corner allowance (ft)	0
Waste factor (%)	5
Length needed (ft)	=(B1-B2+B3)*(1+B4/100)

Table to find the stock pieces and leftover

Length needed (ft)	42.7
Stock length (ft)	12
Stock pieces (before rounding up)	=B1/B2
Stock pieces	=ROUNDUP(B1/B2,0)
Leftover (ft)	=B4*B2-B1

Table to find the pieces assigned wall by wall

Wall 1 net length (ft)	10
Wall 2 net length (ft)	=12-40/12
Wall 3 net length (ft)	10
Wall 4 net length (ft)	12
Stock length (ft)	8
Pieces wall by wall	=ROUNDUP(B1/B5,0)+ROUNDUP(B2/B5,0)+ROUNDUP(B3/B5,0)+ROUNDUP(B4/B5,0)

Table to find the estimated cost

Stock pieces	4
Price per piece ($)	12.50
Estimated cost ($)	=B1*B2

Table to find the length the pieces you have can cover

Pieces you have	3
Stock length (ft)	12
Waste factor (%)	5
Length covered (ft)	=B1*B2/(1+B3/100)

Table to find the perimeter from feet and inches

Length, feet part	12
Length, inches part	6
Width, feet part	10
Width, inches part	3
Room length (ft)	=B1+B2/12
Room width (ft)	=B3+B4/12
Perimeter (ft)	=2B5+2B6

After pasting, the upper rows of column B are the inputs and the last rows are calculated automatically.
The first table gives a perimeter of 44 ft. The second gives a total opening width of about 9.3333 ft (door 40 in + patio door 72 in; for more kinds, add width and count rows and extend the formula, such as "+B5*B6"). The third gives a corner allowance of about 0.6667 ft.
The fourth table gives a length needed of 42.7 ft (perimeter 44 ft − door 40 in, no corner allowance, 5% waste). The fifth uses ROUNDUP to give 4 pieces and 5.3 ft leftover, with 3.5583 before rounding up in B3.
The sixth is the wall-by-wall count: 2 + 2 + 2 + 2 = 8 pieces in the example. The seventh gives a cost of $50.00, the eighth a length of about 34.2857 ft covered by 3 pieces, and the ninth turns 12 ft 6 in × 10 ft 3 in into 12.5 ft × 10.25 ft with a perimeter of 45.5 ft.

How to calculate it in Google Sheets

Copy the whole table below and paste it into cell A1 in Google Sheets. It works as is.

Table to find the room perimeter

Room length (ft)	12
Room width (ft)	10
Perimeter (ft)	=2*(B1+B2)

Table to find the total opening width

Opening 1 width (in)	40
Opening 1 count	1
Opening 2 width (in)	72
Opening 2 count	1
Total opening width (ft)	=(B1B2+B3B4)/12

Table to find the corner allowance

Number of corners	4
Allowance per corner (in)	2
Corner allowance (ft)	=B1*B2/12

Table to find the length needed (with waste)

Perimeter (ft)	44
Total opening width (ft)	=40/12
Corner allowance (ft)	0
Waste factor (%)	5
Length needed (ft)	=(B1-B2+B3)*(1+B4/100)

Table to find the stock pieces and leftover

Length needed (ft)	42.7
Stock length (ft)	12
Stock pieces (before rounding up)	=B1/B2
Stock pieces	=ROUNDUP(B1/B2,0)
Leftover (ft)	=B4*B2-B1

Table to find the pieces assigned wall by wall

Wall 1 net length (ft)	10
Wall 2 net length (ft)	=12-40/12
Wall 3 net length (ft)	10
Wall 4 net length (ft)	12
Stock length (ft)	8
Pieces wall by wall	=ROUNDUP(B1/B5,0)+ROUNDUP(B2/B5,0)+ROUNDUP(B3/B5,0)+ROUNDUP(B4/B5,0)

Table to find the estimated cost

Stock pieces	4
Price per piece ($)	12.50
Estimated cost ($)	=B1*B2

Table to find the length the pieces you have can cover

Pieces you have	3
Stock length (ft)	12
Waste factor (%)	5
Length covered (ft)	=B1*B2/(1+B3/100)

Table to find the perimeter from feet and inches

Length, feet part	12
Length, inches part	6
Width, feet part	10
Width, inches part	3
Room length (ft)	=B1+B2/12
Room width (ft)	=B3+B4/12
Perimeter (ft)	=2B5+2B6

The same formulas as Excel (basic arithmetic and ROUNDUP) work as is. Copy the whole table, paste it into cell A1 and change column B to your own numbers. ROUNDUP(value, 0) rounds up to a whole number.

How to calculate it in Python

import math

room_length_ft = 12      # room length (ft)
room_width_ft = 10       # room width (ft)
# Openings with no baseboard as (width in inches, count). Use an empty list [] for crown molding or trim
openings = [
    (40, 1),             # door (including casing)
    (72, 1),             # patio door
]
stock_length_ft = 8      # stock length (ft)
loss_rate = 0.05         # waste factor (5% -> 0.05)
corner_count = 0         # number of inside and outside corners (0 to add nothing)
corner_allow_in = 2      # allowance per corner (in)
price_per_piece = 9.25   # price of one stock piece ($). None if unknown
have_count = 3           # pieces you have. None if none

perimeter = 2 * (room_length_ft + room_width_ft)                        # perimeter (ft)
opening_total = sum(w * n for (w, n) in openings) / 12                  # total opening width (ft)
corner_add = corner_count * corner_allow_in / 12                        # corner allowance (ft)
required = (perimeter - opening_total + corner_add) * (1 + loss_rate)   # length needed (ft)
pieces_raw = required / stock_length_ft                                 # pieces before rounding up
pieces = math.ceil(pieces_raw)                                          # stock pieces
leftover = pieces * stock_length_ft - required                          # leftover (ft)

print(f"Perimeter: {perimeter:.4g} ft")
print(f"Total opening width: {opening_total:.4g} ft")
print(f"Length needed (with waste): {required:.5g} ft")
print(f"Stock pieces: {pieces_raw:.4f} -> {pieces}, leftover {leftover:.4g} ft")
if price_per_piece is not None:
    print(f"Estimated cost: ${pieces * price_per_piece:,.2f}")
if have_count is not None:
    coverable = have_count * stock_length_ft / (1 + loss_rate)          # length the pieces cover (ft)
    print(f"{have_count} pieces cover: {coverable:.4g} ft, short by {max(0, pieces - have_count)}")

# Pieces assigned wall by wall (openings placed widest first on the wall with the most length left)
walls = [room_width_ft, room_length_ft, room_width_ft, room_length_ft]   # walls 1 to 4
for (w, n) in sorted(openings, reverse=True):
    for _ in range(n):
        idx = walls.index(max(walls))
        walls[idx] -= w / 12
wall_pieces = sum(math.ceil(l / stock_length_ft) for l in walls)
print(f"Net length of each wall: {[round(l, 4) for l in walls]} -> {wall_pieces} pieces wall by wall")

It runs with the standard library only (math.ceil rounds up). Add (width, count) pairs to the openings list for any number of kinds, or use an empty list for trim that subtracts nothing, like crown molding. If you measured the perimeter directly, change it to something like perimeter = 46.5, and for the wall-by-wall count set the walls list to your own wall lengths. Change the sizes at the top to your own numbers and run it.

How to write it in LaTeX and other math languages (copy and paste)

Room perimeter (total wall length)

P = 2 × (L + W)

P = 2(L + W)

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>P</mi>
    <mo>=</mo>
    <mn>2</mn>
    <mo>&#x2062;</mo>
    <mrow><mo>(</mo><mi>L</mi><mo>+</mo><mi>W</mi><mo>)</mo></mrow>
  </mrow>
</math>

P = 2(L + W)

2*(L + W)

P := 2*(L + W);

P = 2*(L + W);

P = 2(L + W)

Total width of openings (subtracted for baseboard only)

D = Σ (wᵢ × nᵢ)

D = \sum_{i} \left( w_i \times n_i \right)

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>D</mi>
    <mo>=</mo>
    <munder><mo>&#x2211;</mo><mi>i</mi></munder>
    <mrow>
      <mo>(</mo>
      <msub><mi>w</mi><mi>i</mi></msub>
      <mo>&#xD7;</mo>
      <msub><mi>n</mi><mi>i</mi></msub>
      <mo>)</mo>
    </mrow>
  </mrow>
</math>

D = sum_i (w_i xx n_i)

Dopen = Total[w*n]

Dopen := add(w[i]*n[i], i = 1 .. k);

D = sum(w .* n);

D = ∑_i (w_i × n_i)

Corner allowance (extra for each miter cut)

C = n_c × c

C = n_c \times c

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>C</mi>
    <mo>=</mo>
    <msub><mi>n</mi><mi>c</mi></msub>
    <mo>&#xD7;</mo>
    <mi>c</mi>
  </mrow>
</math>

C = n_c xx c

Ccorner = nc*c

C := nc*c;

C = nc*c;

C = n_c × c

Length needed (with waste)

Q = (P − D + C) × (1 + r)

Q = (P - D + C)(1 + r)

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>Q</mi>
    <mo>=</mo>
    <mrow><mo>(</mo><mi>P</mi><mo>&#x2212;</mo><mi>D</mi><mo>+</mo><mi>C</mi><mo>)</mo></mrow>
    <mo>&#x2062;</mo>
    <mrow><mo>(</mo><mn>1</mn><mo>+</mo><mi>r</mi><mo>)</mo></mrow>
  </mrow>
</math>

Q = (P - D + C)(1 + r)

Q = (P - Dopen + Ccorner)*(1 + r)

Q := (P - Dopen + C)*(1 + r);

Q = (P - D + C)*(1 + r);

Q = (P − D + C)(1 + r)

Stock pieces and leftover

N = ⌈Q ÷ S⌉,  R = N × S − Q

N = \left\lceil \frac{Q}{S} \right\rceil,\quad R = N S - Q

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>N</mi>
    <mo>=</mo>
    <mo>&#x2308;</mo>
    <mfrac><mi>Q</mi><mi>S</mi></mfrac>
    <mo>&#x2309;</mo>
    <mo>,</mo>
    <mi>R</mi>
    <mo>=</mo>
    <mi>N</mi><mo>&#x2062;</mo><mi>S</mi>
    <mo>&#x2212;</mo>
    <mi>Q</mi>
  </mrow>
</math>

N = |~ Q / S ~|,  R = N S - Q

Npieces = Ceiling[Q/S]; R = Npieces*S - Q

N := ceil(Q/S);  R := N*S - Q;

N = ceil(Q/S); R = N*S - Q;

N = ⌈Q/S⌉, R = NS − Q

Pieces assigned wall by wall (the practical count with fewer seams)

N_w = Σ ⌈ℓᵢ ÷ S⌉

N_w = \sum_{i=1}^{4} \left\lceil \frac{\ell_i}{S} \right\rceil

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <msub><mi>N</mi><mi>w</mi></msub>
    <mo>=</mo>
    <munderover><mo>&#x2211;</mo><mrow><mi>i</mi><mo>=</mo><mn>1</mn></mrow><mn>4</mn></munderover>
    <mo>&#x2308;</mo>
    <mfrac><msub><mi>&#x2113;</mi><mi>i</mi></msub><mi>S</mi></mfrac>
    <mo>&#x2309;</mo>
  </mrow>
</math>

N_w = sum_(i=1)^4 |~ l_i / S ~|

Nw = Total[Ceiling[l/S]]

Nw := add(ceil(l[i]/S), i = 1 .. 4);

Nw = sum(ceil(l ./ S));

N_w = ∑_(i=1)^4 ⌈ℓ_i/S⌉

Estimated cost (price per piece or per foot)

T = N × p  or  T = Q × p_m

T = N \times p \quad\text{or}\quad T = Q \times p_m

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>T</mi><mo>=</mo><mi>N</mi><mo>&#xD7;</mo><mi>p</mi>
    <mtext>&#x2003;or&#x2003;</mtext>
    <mi>T</mi><mo>=</mo><mi>Q</mi><mo>&#xD7;</mo><msub><mi>p</mi><mi>m</mi></msub>
  </mrow>
</math>

T = N xx p  or  T = Q xx p_m

T = Npieces*p  (* or T = Q*pm *)

T := N*p;  # or T := Q*pm;

T = N*p;  % or T = Q*pm;

T = N × p  or  T = Q × p_m

Length the pieces you have can cover (working backward)

Q_h = n_h × S ÷ (1 + r)

Q_h = \dfrac{n_h S}{1 + r}

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <msub><mi>Q</mi><mi>h</mi></msub>
    <mo>=</mo>
    <mfrac>
      <mrow><msub><mi>n</mi><mi>h</mi></msub><mo>&#x2062;</mo><mi>S</mi></mrow>
      <mrow><mn>1</mn><mo>+</mo><mi>r</mi></mrow>
    </mfrac>
  </mrow>
</math>

Q_h = (n_h S) / (1 + r)

Qh = nh*S/(1 + r)

Qh := nh*S/(1 + r);

Qh = nh*S/(1 + r);

Q_h = (n_h S)/(1 + r)

Perimeter from feet-and-inches measurements

L = L_ft + L_in ÷ 12,  W = W_ft + W_in ÷ 12,  P = 2L + 2W

L = L_{ft} + \frac{L_{in}}{12},\quad W = W_{ft} + \frac{W_{in}}{12},\quad P = 2L + 2W

<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
  <mrow>
    <mi>L</mi><mo>=</mo><msub><mi>L</mi><mi>ft</mi></msub><mo>+</mo><mfrac><msub><mi>L</mi><mi>in</mi></msub><mn>12</mn></mfrac>
    <mo>,</mo>
    <mi>W</mi><mo>=</mo><msub><mi>W</mi><mi>ft</mi></msub><mo>+</mo><mfrac><msub><mi>W</mi><mi>in</mi></msub><mn>12</mn></mfrac>
    <mo>,</mo>
    <mi>P</mi><mo>=</mo><mn>2</mn><mi>L</mi><mo>+</mo><mn>2</mn><mi>W</mi>
  </mrow>
</math>

L = L_(ft) + L_(in)/12,  W = W_(ft) + W_(in)/12,  P = 2L + 2W

L = Lft + Lin/12; W = Wft + Win/12; P = 2*L + 2*W

L := Lft + Lin/12;  W := Wft + Win/12;  P := 2*L + 2*W;

L = Lft + Lin/12; W = Wft + Win/12; P = 2*L + 2*W;

L = L_ft + L_in/12, W = W_ft + W_in/12, P = 2L + 2W

How to have ChatGPT do the calculation

You are an assistant for interior trim quantity calculations. Do the calculations below by actually running Python code, and base your answer only on the numbers from the output (do not calculate in your head or guess).

I am installing baseboard in a rectangular room 12 ft long and 10 ft wide. There is one door (40 in wide including casing) and one patio door (72 in wide), and no baseboard goes under them. The stock length is 8 ft, the waste factor is 5%, and one stock piece costs $9.25.
Find each of the following.
1. The room perimeter (ft)
2. The total opening width (ft) and the net length that gets baseboard (ft)
3. The length needed with waste (ft)
4. The number of stock pieces needed (the value before rounding up and the rounded-up count) and the leftover (ft)
5. The estimated cost ($)
6. The number of pieces when stock is assigned wall by wall (place openings widest first on the wall with the most length left; round up each wall's net length ÷ stock length and add them)

Show the formulas you used and the numbers from the output.

How to Use

1

Enter your numbers

Type the numbers you want to calculate with into the input fields
2

Calculate

Press the "Calculate" button
3

Check the result

The result appears on the spot. The same page also explains the idea behind the calculation and the formula

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\(L\)	ell	The room length (ft), from "length". Use the inside dimensions (wall surface to wall surface).
\(W\)	double-u	The room width (ft), from "width". It does not matter which side you call the length and which the width.
\(P\)	pee	The room perimeter (ft), from "perimeter". For a rectangular room \(P = 2(L + W)\); for other shapes it is the total of the wall lengths.
\(w_i\)	double-u sub i	The width of the opening in row \(i\) (ft), from "width". The subscript \(i\) is the row number (row 1, row 2 …).
\(n_i\)	en sub i	The number of openings in row \(i\), from "number". It is 2 if you have two doors of the same width.
\(\sum\)	sigma	The Greek letter sigma (the Greek S), standing for "sum": add them all up. \(\sum (w_i \times n_i)\) is "width × count of each row, all added together".
\(D\)	dee	The total width of openings (ft), from "deduction". It is subtracted from the perimeter for baseboard, and taken as 0 for crown molding and transition strips.
\(n_c\)	en sub cee	The number of inside and outside corners: n for "number" with c for "corner". A rectangular room has 4 inside corners.
\(c\)	cee	The allowance per corner, from "corner". In the calculator you enter it in inches, and it is converted to feet (2 in ≈ 0.167 ft).
\(C\)	capital cee	The corner allowance (ft). \(C = n_c \times c\), the length added for the miter cuts at all the corners.
\(r\)	ar	The waste factor, from "rate". For 5%, \(r = 0.05\), and you multiply by \(1 + r = 1.05\).
\(Q\)	cue	The length needed (ft), from "quantity". \(Q = (P - D + C)(1 + r)\), the length to buy with waste allowed for.
\(S\)	ess	The stock length (ft), from "stock" - the length one piece of trim is sold in (8 ft, 12 ft, 16 ft and so on).
\(\lceil\ \rceil\)	ceiling (round up)	The ceiling function: round the number inside up to a whole number. \(\lceil 3.558 \rceil = 4\) and \(\lceil 3 \rceil = 3\). It stands for "if it does not divide evenly, buy one more piece".
\(N\)	en	The number of stock pieces needed, from "number". It is found with \(N = \lceil Q \div S \rceil\).
\(R\)	capital ar	The leftover (ft), from "remainder". \(R = N \times S - Q\), the total stock bought minus the length needed.
\(\ell_i\)	script ell sub i	The net length of wall \(i\) (walls 1 to 4, ft): that wall's length minus the openings on it. \(\ell\) is a cursive l for "length", used to tell it apart from the room length \(L\).
\(N_w\)	en sub double-u	The number of pieces when stock is assigned wall by wall. The subscript w stands for "wall". It is found with \(N_w = \sum \lceil \ell_i \div S \rceil\).
\(p\)	pee	The price of one stock piece ($ per piece), from "price".
\(p_m\)	pee sub em	The price per unit of length ($ per ft in US units; the m comes from "meter" in metric). Used for trim sold by length or in rolls.
\(T\)	tee	The estimated cost ($), from "total". It is found with \(T = N \times p\) or \(T = Q \times p_m\).
\(n_h\)	en sub aitch	The number of stock pieces you have: n for "number" with h for "have".
\(Q_h\)	cue sub aitch	The net length the pieces you have can cover (ft). It is found with \(Q_h = n_h \times S \div (1 + r)\).
\(L_{ft},\ W_{ft}\)	ell sub f t, double-u sub f t	The feet part of a length measured in feet and inches. For 12 ft 6 in, \(L_{ft} = 12\).
\(L_{in},\ W_{in}\)	ell sub i n, double-u sub i n	The inches part of a length measured in feet and inches. For 12 ft 6 in, \(L_{in} = 6\). Divide by 12 to change it to feet.
\(12\)	twelve	The number of inches in a foot (1 ft = 12 in). Dividing inches by 12 gives feet.
\(\mathrm{ft},\ \mathrm{in}\)	feet, inches	US units of length. Plans write them as 12' 6" (12 ft 6 in). 1 ft = 12 in = 0.3048 m.

Baseboard, Crown Molding and Trim Calculator (Linear Feet and Pieces)

Table of Contents

What you can do on this page

What is this calculation used for?

Formulas and figures

Symbols and terms

Symbols

Terms

Good to know before you start

How to calculate it in Excel

How to calculate it in Google Sheets

How to calculate it in Python

How to write it in LaTeX and other math languages (copy and paste)

How to have ChatGPT do the calculation

How to Use

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