Free · no sign-up · runs in your browser, nothing uploaded
Enter the room size and get the litres and number of tins needed, allowing for doors, windows and the number of coats. Free, instant.
Prefer a full window? Open the tool on its own page →
Typically 10–12 m² per coat for emulsion; the calculator lets you change it for the paint you're using.
Does it allow for doors and windows?Yes — enter how many and it takes them off the wall area.
Should I add a bit extra?It adds 10% for touch-ups by default.