RemoditFree paint calculator
Find the paintable wall area and estimate how many gallons to purchase before your next room refresh.
Paint calculator
Estimate wall paint, with optional deduction for doors and windows. Measurements are in feet.
How to use this calculator
Measure room length, width, and wall height in feet. Enter the number of coats and any standard doors or windows to deduct. Adjust the coverage per gallon for your chosen paint.
Important estimating assumptions
The tool subtracts typical 3 × 7-foot doors and 3 × 4-foot windows, then applies coats and a touch-up allowance. Check the paint manufacturer's stated spread rate.
How many square feet does one gallon of paint cover?
A common planning assumption is around 350 square feet per gallon per coat, but actual coverage depends on paint, substrate, texture and application. Update the coverage setting to match your product.
More free Remodit calculators
For saved projects, detailed scopes and contractor bid comparisons, use the Remodit app.