Paint Calculator
Litres of paint needed for a given wall area, number of coats and coverage rate.
Results
Volume
7.64
L
Area
42.00
m²
Area
84.00
m²
What this tool does
Subtract the doors and windows, multiply by the number of coats and divide by the coverage printed on the tin. Porous, rough or strongly coloured surfaces drink more paint than the label suggests, so round up when in doubt.
Formula
litres = (area − openings) × coats ÷ yield
Variables
| Symbol | Meaning | Unit |
|---|---|---|
a | Area | m² |
o | Area of doors and windows | m² |
cc | Number of coats | — |
cv | Coverage per litre | m²/L |
L | Volume | L |
AP | Area | m² |
TA | Area | m² |
Worked example
- Area48 m²
- Area of doors and windows6 m²
- Number of coats2
- Coverage per litre11 m²/L
- Volume7.64 L
- Area42.00 m²
- Area84.00 m²
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- Always order a little more material than the calculated quantity. Cuts, breakage and pattern matching create waste that depends on the shape of the job.