🖌️ Paint Calculator
Gallons of paint needed for any room
About this calculator
Never run out of paint mid-wall again. Enter your wall dimensions (or total square footage) plus the number of doors and windows, and the calculator estimates how many litres or gallons you need for your chosen number of coats, based on standard coverage of about 350–400 sq ft per gallon (roughly 9–10 m² per litre). It subtracts openings automatically so you don't overbuy.
Tip: buy about 10% extra for touch-ups — matching a paint colour later is never as easy as having the original can on the shelf.