Flooring & Finishes
Paint Calculator
Estimate gallons of wall paint for a room after subtracting doors and windows.
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Flooring & Finishes
Wainscoting Calculator
Plan wainscoting or beadboard for a room. Enter the wall length, openings and panel height to find the sheets of panelling and linear feet of trim to buy.
What is a wainscoting calculator?
Wainscoting is panelling on the lower part of a wall, finished with a cap or chair rail on top and baseboard below. This calculator estimates the panel material and the two runs of trim.
How does it work?
Openings are subtracted from the wall length to get the panelled run. Run × height gives the area, which is divided by 32 sq ft per 4 × 8 sheet after waste. Trim is the same run plus waste. For the wall above the rail, the Paint Calculator gives gallons; for solid-wood battens, use the Board Foot Calculator.
What information is needed?
- Total length of walls to panel
- Width of doorways and openings
- Wainscot height in inches
How to use the Wainscoting Calculator
- Measure each wall at floor level and add them.
- Subtract door openings.
- Choose the height.
- Select Calculate.
The formula
In plain terms, here is the calculation the tool runs:
Run = Wall length − Openings
Area = Run × (Height ÷ 12)
Sheets = ⌈Area × (1 + Waste) ÷ 32⌉
- 32
- Square feet in a 4 × 8 sheet
- Trim
- Run × (1 + Waste) for each rail
Worked example
Example
A dining room with 40 ft of wall, a 6 ft opening and 36" wainscot, 10% waste.
- 40 − 6 = 34 ft of run
- 34 × 3 = 102 sq ft
- 102 × 1.10 ÷ 32 = 3.5 → 4 sheets
- 34 × 1.10 = 37.4 → 38 ft of each trim
4 sheets, 38 ft of cap rail and 38 ft of baseboard.
Frequently asked questions
How tall should wainscoting be?
About one third of the wall height — 32–36″ for 8 ft ceilings. Taller (48–60″) suits board-and-batten in larger rooms.
Can I cut a sheet into two strips?
Yes. For wainscot under 48″, rip 4 × 8 sheets lengthwise to get two 8 ft strips — this calculator’s area method already accounts for that.
What about windows?
Windows above the wainscot height do not affect it. Low windows need a short return of trim around the sill.
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