Free tool
Paint calculator: how much paint does your room need?
Enter the room size and openings to estimate litres of paint and primer, and which pack sizes to buy. Works in feet or metres.
Estimates only, for planning. Measurements and quantities for your home are confirmed on site.
How the calculation works
Wall area is the room perimeter times the wall height. We subtract about 21 sq ft for each door and 16 sq ft for each window, add the ceiling if you tick it, then multiply by the number of coats and divide by the coverage per litre.
Interior emulsions typically cover around 100 to 140 sq ft per litre per coat on a smooth, primed wall. Check the exact figure on your paint tin and change the coverage field to match.
Tips for an accurate estimate
New plaster and dark to light colour changes may need an extra coat. Rough or textured walls use more paint. Buy a little extra from the same batch so touch ups match.
How much paint do I need for a 10 x 12 ft room?
With 9.5 ft walls, one door, one window and two coats, it is roughly 6.5 to 7 litres of emulsion at 120 sq ft per litre per coat.
Do I need primer?
Yes on new plaster, patched areas or big colour changes. One coat of primer helps the paint cover evenly and last longer.
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Use the toolWant exact numbers for your home?
Call us. A designer will measure, plan and show you the finished rooms before work starts.