About the Wall Paint Calculator
Paint for walls only, from the wall area or room dimensions, with openings deducted.
Also known as: paint for walls, emulsion calculator, wall paint quantity, interior wall paint.
How to use this calculator
- Enter enter, openings to deduct, coats, coverage per litre and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
litres = (wall area − openings) × coats ÷ coverage
Worked example
Using the values pre-filled in the calculator above:
- Enter: Room dimensions
- Wall perimeter = 18 m
- Wall height = 2.4 m
- Openings to deduct = 5 m²
- Coats = 2
- Coverage per litre = 11 m²
the calculator returns:
- Paint required: 6.95 litres
- Net wall area: 38.2 m²
- 5 litre tins: 2
- 2.5 litre tins: 3