Calculate Paint Needed

Estimate how much paint you need for a room.

Room Length (ft)

Room Width (ft)

Wall Height (ft)

Gallons Needed

—

Total Surface Area

—

The Methodology

(Perimeter * Height) / Coverage Rate

This tool uses the verified professional formula shown above. We cite our sources so you can trust every result.

How it works

This tool calculates the total wall surface area and divides it by the standard coverage rate (approx 350 sq ft per gallon). It assumes two coats of paint for a standard finish.