Paint Calculator

Estimate how much paint you need for your walls and ceiling — including doors, windows, coats and waste.

Your room

Room length (ft)

Room width (ft)

Wall height (ft)

Number of coats

Doors

Windows

Paint coverage (sq ft / gallon) Waste allowance

Planning estimate only. Actual coverage varies by paint, surface, texture and application method.

Estimated materials

Wall area—

Ceiling area—

Total paintable area—

Paint needed—

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How the paint calculator works

We estimate wall area from room perimeter and wall height, subtract standard allowances for doors and windows, include the ceiling, then account for coats and waste.

Before you buy paint

Check the coverage rate printed on the paint can. Rough or porous surfaces can require more paint.