Paint Calculator
Gallons for the room — not a guess.
Enter the room, openings, and coverage from the can. Get finish paint and primer rounded up to whole gallons, plus a square-foot breakdown so you can see the math. Numbers stay on this device.
What it does
Room dimensions
Length, width, and height in feet and inches. Paint walls, ceiling, or both.
Doors and windows
Subtracts 21 sq ft per door and 15 sq ft per window from the walls.
Match the can
Finish and primer coats, with coverage you can set from the label. Typical finish is 350 sq ft/gal; primer is 250.
Rounded up to buy
Exact gallons plus whole gallons to purchase for finish and primer.
The math, in numbers
Walls, openings, net walls, ceiling, moulding, and finish surface in square feet.
On this device
No account. Room numbers stay on your iPhone or iPad. Free, supported by ads.