Paint Calculator

Enter the room size, doors, windows and number of coats to estimate how much paint to buy.

Measured in

Room length

Room width

Wall height

Doors

Windows

Coats

Coverage per litre per coat (m²)

Paint the ceiling too

–

How the estimate works

Wall area = 2 × (length + width) × height. A standard door (about 1.9 m²) and window (about 1.5 m²) are subtracted, the ceiling is added if you tick it, and the total is multiplied by the number of coats and divided by the paint's coverage. A 14 × 12 ft room with 10 ft walls needs roughly 9 litres for two coats of emulsion.

Coverage

The coverage per litre is printed on the tin. Typical figures are 8–12 m² per litre per coat for emulsion on smooth plastered walls; rough, porous or freshly plastered walls soak up more, and dark-to-light colour changes need an extra coat. Primer and putty have their own coverage — calculate them separately.

Buying tips

Buy about 10% extra for touch-ups and keep it labelled.
Paint is sold in several tin sizes (for example 1 litre, about 3.6 litres and larger drums); combining sizes avoids waste.
Buy all tins from the same batch so the colour matches.

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How it works

Enter — type or paste your values or text.
Get the result — it is worked out in your browser.
Adjust — change the inputs to compare, or copy the result.

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