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Paint Calculator
Estimate gallons of paint needed. Change the inputs below and the estimate updates immediately.
Input
Your numbers
Calculated result
Paint needed
2.5 gallons
Paintable area
864 ft²
Estimate only. Verify important decisions with an appropriate professional or official source.
How to use it
A quick estimate, without the spreadsheet.
Inputs and units
Enter room length, width and wall height in feet, then number of coats.
Formula
Wall area = 2 × (length + width) × height; gallons = wall area × coats / 350.
Worked example
A 10 × 10 foot room with 8-foot walls and two coats uses about 1.83 gallons.
Assumptions and limitations
Assumes 350 square feet per gallon per coat. Includes full walls without subtracting openings; excludes ceiling, trim and primer. Coverage depends on the product and surface.