Wall Paint Calculator

Calculate exactly how much paint you need for interior walls. Enter your room measurements and get instant results.

Room Dimensions

Length (ft)

Width (ft)

Height (ft)

Walls to Paint

Wall A0.0×0.0 ft = 0.00 sq ftWall B0.0×0.0 ft = 0.00 sq ftWall C0.0×0.0 ft = 0.00 sq ftWall D0.0×0.0 ft = 0.00 sq ftCeiling0.0×0.0 ft = 0.00 sq ft

Doors & Windows

Doors

Windows

Surface & Method

Surface Type

Application Method

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 computes each selected wall area individually (L × H or W × H), subtracts door and window areas, then applies surface and method factors. Divide net area by coverage rate and multiply by coats.