How it works
Estimate paint volume after deducting doors and windows from your area. Coverage depends on the product and surface condition.
litres = area × coats / coverage × (1+allowance)
Worked example
Show example inputs and result
Paintable area: 60 · Coats: 2 · Coverage per litre per coat: 10 · Extra allowance: 10.
- Paint needed
- 13.2 L
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy