Paint Calculator
Paint Calculator
What is the Paint Calculator?
Paint Calculator estimate paint quantity and cost for walls, ceilings, and exterior surfaces. It is part of Home of Calculators's Construction Calculators suite for building materials, measurements, cost estimates, and project planning. The calculator is designed for contractors, DIY enthusiasts, architects, but anyone can use it. No signup, no ads, no tracking. Just accurate math, computed locally in your browser using a BigNumber-precision math engine.
Paint quantity is calculated by dividing the total wall area by the coverage rate of the paint. Most paints cover 350–400 sq ft per gallon per coat. Always add 10% for waste and touch-ups.
AreaTotal wall area (sq ft)CoveragePaint coverage (sq ft/gal)How to use the Paint Calculator
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Calculate wall area
Multiply wall height by wall length, subtract openings (doors/windows).
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Determine coverage
Check the paint can for coverage per gallon (typically 350–400 sq ft).
- 3
Divide and add waste
Divide area by coverage, then add 10% for waste and second coat.
Quick tips
- All calculations run locally in your browser; your data never leaves your device.
- For best results on mobile, rotate to landscape when entering many values.
- Bookmark this page to come back to your calculation anytime.
- Need a different calculator? Try our visual builder to create your own.
Why Home of Calculators
- 100% private (calculations run in your browser)
- 128-bit BigNumber precision (no rounding errors)
- Works on any device: phone, tablet, desktop
- Free forever (no signup, no ads, no upsells)
Frequently asked questions
Is the Paint accurate?
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Yes. Home of Calculators uses a BigNumber-precision math engine (64-128 decimal digits) to ensure calculations are accurate. We run 96+ automated tests covering unit conversion, financial formulas, health formulas, and more. For critical decisions (financial, medical, legal), we still recommend consulting a qualified professional.
Is the Paint Calculator free?
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Yes. Every calculator on Home of Calculators is 100% free, with no signup, no ads, and no hidden fees. The entire platform is free forever.
Do you store the values I enter?
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No. All calculations happen in your browser. We never see, store, or transmit your inputs to any server. Your data stays on your device.
Can I use the Paint on my phone?
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Yes. Home of Calculators is fully responsive and works on any device (phone, tablet, laptop, or desktop). The interface adapts to your screen size.
Can I embed this calculator on my own website?
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Yes. Click the "Share" button to get an iframe embed code. The embedded calculator will look like any other Home of Calculators widget. You can also build a fully customized version using our visual builder.
Can I build my own custom calculator?
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Absolutely. Home of Calculators's visual builder lets you add fields, write formulas, choose a theme, and brand the result with your own logo, all without writing code.