Paint Coverage Calculator — How Much Paint Do I Need?

How to use

1. Enter room length, width and ceiling height.
2. Count doors and windows (or adjust the defaults).
3. Set coats and your paint's coverage (printed on the tin); read litres + gallons instantly.

About this tool

Paint tins state coverage per litre (typically 10–13 m²/L for wall emulsion, less for rough surfaces). The tool computes net wall area from perimeter × height minus doors (≈1.9 m² each) and windows (≈1.5 m² each), multiplies by coats, divides by your tin's coverage and adds 10% cutting/patching allowance — the same math professional decorators use for estimates.

FAQ

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