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Paint Calculator — Wall Coverage & Paint Needed
Estimate paint needed from wall area, openings, coats and product coverage.
Open full calculator ↗Free to use. No account needed to calculate.
How to use it
- Use the calculator above and replace the example numbers with your own.
- Check the units and choices beside each input. Your result updates as you type.
- Review the breakdown, then share a copy or carry the answer into another calculator.
How the calculation works
Gallons = (wall area − openings) × coats ÷ coverage per gallon × (1 + extra allowance ÷ 100). The purchase estimate rounds up to whole gallons.
A worked example
These are illustrative inputs, not recommendations. The result is calculated with the same engine used by the tool.
- Wall area (square feet)
- 800
- Doors & windows area (sq ft)
- 80
- Coats
- 2
- Coverage per gallon (sq ft)
- 350
- Extra allowance (%)
- 10
Questions about Paint Calculator — Wall Coverage & Paint Needed
What does this calculator do?
Estimate paint needed from wall area, openings, coats and product coverage.
Can I calculate without an account?
Yes. Calculate for free without signing in. Sign in only if you want to save calculations and personal plans.
What to keep in mind
Use coverage from your paint label. Texture, porosity and application method can affect coverage; the extra allowance is your planning buffer. Do not subtract openings twice.
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Guide updated November 5, 2026 · About Calcuvero & your privacy