MATERIAL AND PROJECT ESTIMATES
Estimate gallons of paint from wall area, coats, product coverage, and an allowance you choose.
Your result
Enter your values and select Calculate. Your result stays on this device.
Gallons = net area × coats ÷ product coverage × (1 + allowance).
Uses the product coverage you enter. Primer, surface porosity, color change, texture, application loss, and container sizes can change the purchase quantity.
This paint calculator starts with net paintable square footage and the coverage printed for the product you plan to use. It does not hide a universal coverage assumption.
Use case
Use net paintable square footage, planned coats, product coverage, and a touch-up allowance to estimate gallons without assuming one universal coverage rate.
Estimate paint gallons from net surface area, coats, and manufacturer-provided coverage.
Build a reliable scenario
Paint Calculator helps you check a specific home projects question with figures that apply to you. Estimate gallons of paint from wall area, coats, product coverage, and an allowance you choose. Use net paintable square footage, planned coats, product coverage, and a touch-up allowance to estimate gallons without assuming one universal coverage rate. Estimate paint gallons from net surface area, coats, and manufacturer-provided coverage. The page keeps the method and limits visible so the result can be understood, compared, and checked instead of treated as an unexplained answer.
Prepare Net paintable area, Number of coats, Product coverage and Touch-up allowance. Measure net wall or ceiling area in square feet. Enter the planned number of finish coats. Use the manufacturer’s coverage per gallon. Round the result to available container sizes and account for primer separately. Keep units, dates, currency, and time periods consistent.
The stated method is: Gallons = net area × coats ÷ product coverage × (1 + allowance). Change one assumption at a time to see which input drives the result, then compare scenarios on the same basis.
Uses the product coverage you enter. Primer, surface porosity, color change, texture, application loss, and container sizes can change the purchase quantity. Check the input and rounding, then calculate again.
Method and update
Last reviewed: 2026-08-10. This tool performs the stated formula locally in your browser using the values you enter.
Coverage varies by product and surface; use the value on the manufacturer’s technical information.
Use net paintable area when you can measure openings reliably.
No. Calculate primer separately using its own stated coverage.
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