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Paint calculator: how much paint do I need?
Enter the room size, doors and windows and how many coats you plan. The calculator shows the wall area and the litres of paint you need.
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Measure the room length, width and ceiling height.
- Enter the number of doors and windows and how many coats you plan.
- Read the area and the litres of paint – and choose bucket sizes.
Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How much paint per m²?
Typical wall paint covers about 6–8 m² per litre per coat. With two coats, plan about 0.25–0.35 litres per m².
Do I need two coats?
For colour changes, fresh plaster or strong colours, yes. Refreshing the same light colour often needs only one coat with good paint.
Should I buy more paint than calculated?
Yes, about 10 % extra – and keep some for later touch-ups from the same batch.