Construction Calculator - Walls and Finishes

Wall Square Footage Calculator

Calculate wall area for paint, siding, paneling, and wallcoverings.

Before purchasing coverage-based materials, double-check the finished wall dimensions and opening deductions against the latest drawing or field notes.

Reviewed: August 26, 2026

Calculate Wall Square Footage

For the Wall Square Footage Calculator, enter total wall run, wall height, doors and windows, waste allowance, material price, and coverage per unit. It subtracts openings from gross wall area, applies allowance, and reports net area, order area, square yards, package count, and optional cost.

Construction measuring tools arranged beside a residential building project

Formula used

Net area = wall run × height − openings; order area = net area × (1 + waste ÷ 100)

Wall Square Footage Calculator measurement plan showing Total wall run feet, Wall height feet, Doors and windows square feet to subtract

Worked wall square footage example

Wall Square Footage Calculator example: 25.4 ft × 6.11 ft = 155.19 ft² gross; subtracting 40 ft² leaves 115.19 ft². A 10% allowance raises the order area to 126.71 ft² (14.08 yd²).

Turn area into a material list

Use gross and net area to explain the takeoff, then apply waste and package coverage for the specific wall finish.

Layout details outside the area formula

Gables, soffits, wainscot changes, returns, alcoves, sloped ceilings, openings, and reusable offcuts affect net and order area.

Questions specific to this calculation

Which openings should be deducted from wall area?

Add the lengths of walls receiving the same finish, multiply by height, and subtract measured doors and windows only when the ordering method excludes them.