Paint Quantity Calculator
Calculate paint quantity with explicit inputs and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Quantity estimate only. Check dimensions, waste and product coverage for the actual project.
Example Calculation
- Paintable area: 40 m²
- Coats: 2
- Coverage per coat: 10 m²/L
- Waste: 10 %
40 m², two coats, 10 m²/L and 10% waste needs 8.8 L.
Frequently asked questions
How do I use this calculator?
Enter paintable area, coats, coverage per coat, waste. The result updates automatically. Use Reset to restore the example values.
What method does it use?
litres = area × coats / coverage × (1 + waste/100). Quantity estimate only. Check dimensions, waste and product coverage for the actual project.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.