Professional Paint Calculator

Calculate professional paint calculator for construction and building projects.

Free to use

12,500+ users

Updated January 2025

Instant results

Professional Paint Calculator

Estimate paint for interior projects

Imperial (feet, inches, lbs)Metric (mm, cm, m, kg)

Room Dimensions

Room Width (ft)

Room Length (ft)

Room Height (ft)

Openings (to subtract)

Window Width (ft)

Window Height (ft)

# of Windows

# of Doors

Paint Characteristics

Number of Coats

Paint Efficiency (ft²/gal)

Price per unit ($/gallon)

How It Works

This calculator finds the total surface area of the walls and ceiling, then subtracts the area of doors and windows you specify. The result is multiplied by the number of coats and divided by the paint's efficiency to determine the total gallons/liters needed. Always buy a little extra for touch-ups!

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