When to use this calculator
- Estimate room paint amount
- Account for doors and windows
- Compare one coat vs. two coats
- Use label coverage when available
Tips for a better estimate
- Coverage changes by product, surface texture, and color change.
- Primer may be needed separately.
- Rough or porous surfaces may use more paint.
- Keep extra paint for touch-ups.
HomeCalc gives planning estimates only. Product labels, package sizes, coverage rates, supplier conversions, local code, and site conditions can change the final quantity you need.
Frequently asked questions
Should I subtract doors and windows?
Yes, if you want a closer estimate. HomeCalc includes an openings allowance field.
Does primer count as a coat?
Primer is usually planned separately unless your product instructions say otherwise.
Why does coverage vary?
Surface texture, color, product type, and application method all affect coverage.