Paint Calculator (Square Feet)

Calculate how much paint you need using square feet measurements. Ideal for US and imperial measurement users.

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Walls to Paint

Doors & Windows

Doors

Windows

Paint Details

Number of Coats

Coverage (sq ft / gallon)

Standard: 350 — no need to change unless your paint can says otherwise

Enter your room details and click Calculate.

How This Paint Calculator Works

Our calculator uses your room's length, width, and height to calculate the total wall area. It then subtracts space taken up by doors (about 21 sq ft each) and windows (about 15 sq ft each). Finally, it divides the paintable area by the coverage rate of your paint (typically 350 sq ft per gallon) and multiplies by the number of coats you need.