Plan picture frame molding, flat panel (rails and stiles) or beadboard wainscoting for a whole room. Enter the wall lengths, height and spacing, and get evenly sized boxes or panels for each wall, a to-scale layout, linear feet of molding, cap and baseboard, the trim lengths to buy and the material cost.
Last updated:
Wainscoting style
One per line or separated by commas, in decimal feet (10 ft 6 in = 10.5). Enter the pieces of wall between doors and windows separately.
Height and trim
in
Often 32–36 in, or about one third of the wall height; tall wainscoting 54–60 in.
in
0 if there is no baseboard.
in
Layout
in
Boxes are evened out to fill each wall exactly.
in
Same reveal between boxes, below the cap and above the baseboard.
in
in
1×4 = 3 1/2 in actual.
in
in
0 if the stiles sit right on the baseboard.
Buying
%
$
$
$
$
Enter your values to see the result.
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How to use the Wainscoting Calculator
Choose a style: picture frame boxes, flat panel or beadboard.
Enter each wall length in feet; enter sections between doors separately.
Set the wainscot height, baseboard and cap heights.
Set the box width and spacing (or panel, stile and rail widths).
Press Calculate wainscoting to see the layout, linear feet and what to buy.
Wainscoting layout formulas
Picture frame boxes: boxes n = round((L − g) ÷ (b + g)), box width = (L − (n + 1) × g) ÷ n, box height = wainscot height − baseboard − cap − 2g, where L is the wall length, b the target box width and g the spacing (all in inches).
Flat panel: panels n = round((L − s) ÷ (p + s)), with n + 1 stiles of width s; panel width = (L − (n + 1) × s) ÷ n; stile length = height − baseboard − cap − top rail − bottom rail.
Example: a 12 ft wall, 36 in wainscot, 5 1/2 in baseboard, 1 1/2 in cap and 4 in spacing gives a 29 in field and 21 in tall boxes. With a 24 in target width: (144 − 4) ÷ 28 = 5 boxes, each (144 − 24) ÷ 5 = 24 in wide.
Typical wainscoting sizes
Part
Common size
Notes
Height (standard)
32–36 in
About 1/3 of an 8 ft wall; dining rooms often 36 in to protect from chairs
Height (tall)
54–60 in
Bedrooms, entries, stairwells; about 2/3 of the wall
Box spacing (reveal)
3–5 in
Use the same reveal above, below and between boxes
Box width
18–30 in
Narrower boxes on short walls; keep the look consistent around the room
Stiles and rails
1×4 (3 1/2 in)
1×6 bottom rail for a heavier base
Chair rail / cap
1 1/4–2 1/2 in
Cap molding over a 1×4 top rail is a classic combination
Beadboard sheets
4 × 8 ft, 1/4 in
Plank kits come in 3 1/2 in to 5 1/2 in widths
Installation tips
Lay out the room first: mark the cap height with a level all the way around, then lay out boxes wall by wall.
Cut a spacer block equal to the reveal so every box sits the same distance from the trim and its neighbors.
Make a jig or stop block for the miter saw and cut all identical box sides at once.
Center boxes under windows and on feature walls; let narrow walls have fewer, smaller boxes rather than squeezing in one more.
Fill nail holes, caulk the inside edges, prime and paint wainscoting and wall together for a built-in look.
Frequently asked questions
How do you calculate wainscoting box spacing?
Pick a target box width and the reveal (spacing) you want between boxes. The number of boxes is round((wall − spacing) ÷ (box width + spacing)), and the exact box width is (wall − (boxes + 1) × spacing) ÷ boxes. A 12 ft (144 in) wall with 24 in boxes and 4 in spacing gets 5 boxes, each 24 in wide.
How high should wainscoting be?
A common rule is about one third of the wall height, so 32 to 36 inches on an 8 ft wall, and up to about 42 inches on 9 ft walls. Tall or board-and-batten style wainscoting is often 54 to 60 inches, roughly two thirds of the wall.
How much picture frame molding do I need?
Each box needs 2 × (width + height) of molding. Add up all boxes and allow about 10 percent for miter waste. For example, 5 boxes of 24 × 21 in use 5 × 90 in = 450 in, or 37.5 ft, plus waste.
What is the difference between rails and stiles?
Rails are the horizontal boards (top rail under the cap, bottom rail above the baseboard) and stiles are the vertical boards between panels. Together they frame flat or raised panels in shaker-style wainscoting.
How many sheets of beadboard do I need?
Beadboard sheets are usually 4 × 8 ft. Cut them across to your panel height: a 33 in tall field gets two pieces per sheet. Each 4 ft of wall needs one piece, so divide the total pieces by pieces per sheet and add a little waste.
How do I handle doors and windows?
Treat each stretch of wall between openings as its own section and enter it separately. That way every section gets its own evenly spaced boxes that end cleanly at the door or window casing.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.