Walls & Paint calculators
Paint, wallpaper and plasterboard for any room.
Before you buy
How much paint you need depends on three things: the wall area (minus doors and windows), the number of coats, and how far your paint spreads, called its coverage. Coverage varies between products, so the figure printed on your tin is the best guide.
Our paint calculator works out the wall area from your room size. It then suggests a mix of tin sizes sold where you live: UK and European litres, Australian tins, or US gallons and quarts.
Quick tips
- Plan on two coats for a colour change or fresh plaster.
- Rough, textured or new surfaces soak up more paint. Use the lowest coverage figure on the tin.
- Buy all tins of a mixed colour at the same time so the colour matches.
- Keep a little spare for touch-ups.
Every calculator shows its formula and sources. See how we calculate.