Wainscoting Calculator
Enter your room's dimensions and door widths to estimate the wainscoting materials you'll need.
To estimate wainscoting, add the room's wall lengths to get the perimeter, subtract the width of any doors, and that is the linear feet to cover. Divide the linear feet by your board length to get the number of boards, and multiply by the wainscoting height for the panel area in square feet.
How to Use This Calculator
Enter the length and width of the room in feet. The calculator adds the four walls to get the perimeter, which is the total run of wall available for wainscoting. Enter the combined width of any doorways or openings that will not be panelled so they can be subtracted.
Set the length of the boards or panels you plan to buy and the height the wainscoting will rise up the wall. The result shows the linear feet to cover, the number of boards to buy, and the square footage of the panelled band for estimating sheet material or paint.
How the Calculation Works
The perimeter of a rectangular room is twice the sum of its length and width. Subtracting the width of doorways gives the linear feet of wall that actually needs wainscoting.
Dividing that linear footage by the length of each board, and rounding up, gives the number of boards. Multiplying the linear feet by the wainscoting height gives the area of the panelled band, useful when the wainscoting is a continuous surface such as beadboard sheet rather than individual boards.
linear ft = 2(length + width) − openings; boards = ⌈linear ft ÷ board length⌉
Worked Example
A room 12 feet by 10 feet has a perimeter of 2 × (12 + 10) = 44 feet. Subtract a single 3-foot doorway: 44 − 3 = 41 linear feet to cover.
Using 8-foot boards, you need 41 ÷ 8 = 5.1, rounded up to 6 boards. At a wainscoting height of 3 feet, the panelled band is 41 × 3 = 123 square feet.
Assumptions and Limitations
- Assumes a rectangular room; add wall runs manually for L-shaped or bay rooms
- Board count rounds up to whole boards and does not add extra for waste — add 10% for cuts and mistakes
- The panel area is the wainscoting band only, not the full wall height
- Cap rail, base and trim are separate — the linear feet figure sizes them too
When to Use a Wainscoting Calculator
Carpenters, remodelers, and DIY decorators use this when adding wainscoting, board-and-batten, or panel molding to a room. Enter the room's dimensions to estimate linear feet, board count, and panel area before buying materials. Planning ahead lets you order the right amount of paneling and trim in one trip, keep the layout balanced on each wall, and price the project accurately for a client or your own budget.
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Open calculator →Frequently Asked Questions
How do I measure a room for wainscoting?
Add the lengths of all the walls to get the perimeter, then subtract the width of any doors or openings that won't be panelled. The result is the linear feet of wainscoting you need.
How high should wainscoting be?
A common height is about one-third of the wall, roughly 32 to 36 inches, though chair-rail wainscoting can be taller. Enter your chosen height to size the panel area.
How many boards do I need for wainscoting?
Divide the linear feet to cover by the length of each board and round up. For 41 linear feet using 8-foot boards, that is 6 boards before waste.
Should I add extra for waste?
Yes. Add about 10% to the board count for cuts around corners, outlets and mistakes, especially if you are matching a pattern or grain.
Does this include the cap rail and baseboard?
Not as separate items, but the linear-feet figure is exactly what you need to buy cap rail, chair rail and base trim, since those run the same length as the wainscoting.
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