FREE ONLINE CALCULATOR

Paint Calculator

Estimate paint gallons for walls or ceilings with multiple coats and coverage rate.

✓ Instant results ✓ Editable inputs ✓ Formula explained

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CONSTRUCTION · TOOLS

MEASURE Enter project dimensions

ESTIMATE Calculate material volume

PLAN Check practical assumptions

CALCULATION TOOL

Paint Calculator

Change any value and calculate again.

Uses the values you enter. No account required.

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ABOUT THIS TOOL

When to use a paint calculator

Estimate paint gallons for walls or ceilings with multiple coats and coverage rate.

All assumptions are visible and adjustable. Check rates and underlying data against original sources before making a decision.

HOW IT WORKS

The calculation

Gallons required = area × coats ÷ coverage × (1 + waste%). Round up to whole-gallon equivalents.

Read the full guide →

ASSUMPTIONS

Know the limitations

Coverage depends on paint and substrate; primer and textured surfaces may change consumption.

Results are estimates derived from your inputs.