Home & DIY Calculators
Paint Calculator
Enter room dimensions, door/window area, and number of coats to calculate how much paint you need.
312 sq ft
Paintable wall area
1.8 gal
Paint needed
How to use this tool
- 1Enter room length, width, and ceiling height.
- 2Enter door/window area to exclude.
- 3Enter number of coats.
- 4See gallons needed.
Frequently asked questions
How much does a gallon of paint cover?+
Most paints cover about 350-400 square feet per gallon per coat — check your specific paint's label for the exact figure.