Paint Calculator
Calculate gallons of paint and primer for any project. Defaults to 350 ft²/gallon coverage and 2 coats — adjust for textured surfaces.
Inputs
Result
Paint
2.3 gal
Primer
0.0 gal
Total (rounded)
3 gal
- Coats
- 2
- Coverage
- 350 ft²/gal
Diagram
Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.
Formula
Gallons = area × coats ÷ coverage
Pour-window forecast
Free 7-day forecast from Open-Meteo. Green = safe to paint. We never share your location.
Related tools & materials
Calculators
Don't forget
- Primer
- Painters tape
- Drop cloth
- Rollers
- Brushes
Frequently asked questions
A typical 12×12 room (~400 ft² wall area) needs about 2.3 gallons for two coats at 350 ft²/gal coverage.
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Cosyslabs. (2026). Paint Calculator. Rough Estimator!. https://roughestimator.com/paint-calculator
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