Paint Coverage Calculator
Wall area minus openings, times the number of coats, rounded up to whole cans — and how much is left for touch-ups.
Paint Coverage Calculator
Wall area minus the openings, times the number of coats, rounded up to whole cans — and it tells you how much you will have left for touch-ups, which is the point of buying paint.
——
| Gross wall area | — |
|---|---|
| Deductions | — |
| Net area to paint | — |
| Area × coats | — |
| Paint required | — |
| Cans to buy | — |
| Left over | — |
Deductions use 21 ft² per door and 15 ft² per window — ordinary US sizes (about 3×7 and 3×5). Coverage varies by product and by what you are painting over: the figure on the can assumes a smooth, sealed, primed surface. Bare drywall, skim coat, textured plaster and masonry all drink more, sometimes half again. Take the number from the can you are actually buying and adjust it down for porous substrates rather than trusting the default here.