Paint Calculator
Room perimeter
ft
inch
yd
m
cm
Add up all four walls. A 12 × 10 room is 44 ft.
Wall height
ft
inch
yd
m
cm
Doors
Each subtracts 21 sq ft.
Windows
Each subtracts 15 sq ft.
Coats
Two over bare or a colour change, one over the same colour.
Coverage per gallon
sq ft
Check the can. 350–400 sq ft is typical for one coat on primed drywall.
Gallons to buy
2 gal
8 liters
Show the work
Paint Calculator
by Rule Calculator