Paint calculator
How much paint and how many tins you need for a room, minus doors and windows.
How it works
Area = perimeter × height − openings (+ ceiling ≈ (perimeter / 4)²). Litres = area × coats / coverage, + 10% spare.
Results are for guidance only and do not replace professional advice.
Worked example
With the default values:
- Room perimeter (m)16
- Ceiling height (m)2.5
- Doors and windows area (m²)5
- Paint the ceiling too?No
- Number of coats2
- Coverage (m² per litre)10
- Tin size (L)2.5
you get:
- Paint needed7.8 L
- 2.5 L tins4
- Area to paint35 m²
- Including 10% spare0.7 L
Frequently asked questions
How does the “Paint calculator” tool work?
Area = perimeter × height − openings (+ ceiling ≈ (perimeter / 4)²). Litres = area × coats / coverage, + 10% spare.
What do I need to enter?
Just fill in: room perimeter, ceiling height, doors and windows area, paint the ceiling too?, number of coats, coverage. The result updates as you type.
Can you give an example?
Room perimeter (m): 16; Ceiling height (m): 2.5; Doors and windows area (m²): 5; Paint the ceiling too?: No; Number of coats: 2 → Paint needed: 7.8 L; 2.5 L tins: 4.
Is this calculator free, and is my data private?
Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.