Construction
Paint Coverage Calculator
Estimate paint gallons from surface area, number of coats, product coverage, and allowance.
- Free to use
- Runs in your browser
- Level B · Industry formula
- Last reviewed 2026-08-16
Calculator guide
How to use the Paint Coverage Calculator
Estimate paint gallons from surface area, number of coats, product coverage, and allowance. Enter the requested values and select Calculate. The result and supporting values are produced locally in your browser.
Formula
Worked example
1,600 sq ft, two coats, 350 sq ft per gallon, and 5% allowance requires about 9.6 gallons.
What to keep in mind
- Use the coverage rate printed for the actual coating and surface condition.
- Texture, porosity, color change, application method, and waste can change real coverage.
Methodology
This calculator uses deterministic arithmetic and performs the calculation locally in your browser. Verify assumptions, units, and source values for your specific use case.
Review standard: Level B · Industry formula. How calculator reviews work.
Frequently asked questions
What does this calculator calculate?
Estimate paint gallons from surface area, number of coats, product coverage, and allowance.
How is the result calculated?
Gallons = Area × Coats ÷ Coverage per Gallon × (1 + Allowance %).
Can I use the result for an important decision?
Use the result as a calculation aid and verify the inputs, assumptions, and applicable professional or regulatory requirements before relying on it for an important decision.
Does CalculateMeasure store the values I enter?
The calculator performs its arithmetic in your browser. The calculator itself does not need to send your entered values to a server to produce the result.