Paint Calculator
Find how much paint a room needs. Enter the length and width of the room, the wall height, and the area of doors and windows, which do not get paint.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The wall area is the distance around the room times the wall height, minus the openings. That area is multiplied by the number of coats.
One gallon covers about 350 square feet per coat, so the total is divided by that coverage. The gallons are then rounded up to whole gallons.
Worked example
With 2 coats on walls of 322 ft², the room needs 1.8 gal of paint, or 2 whole gallons rounded up.
Questions
How do I measure the room?
Use the length and width of the floor, and the height from floor to ceiling. Add the size of doors and windows to the openings input.
Does the number of coats matter?
Yes. Walls often need two coats, and a dark color over a light one can need more.
Does paint cover every surface the same?
No. Rough, porous or textured walls soak up more paint, so the real amount can be higher than this estimate.
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