Paint calculator
Estimate wall area, paintable surface after doors and windows, and liters of paint needed based on coverage and coats. Switch between meters and feet.
Unit
Length
Width
Height
Number of doors
Number of windows
Paint coats
Coverage (m² per liter)
Result
Wall area: 45 m²
Paintable area: 40 m²
Paint needed: 8 L
How to use
1. Enter room length, width, and height.
2. Add the number of doors and windows to deduct.
3. Set paint coats and coverage (m² per liter).
4. Read wall area, paintable area, and estimated liters.
Example
Paint calculator
Estimate wall area, paintable surface after doors and windows, and liters of paint needed based on coverage and coats. Switch between meters and feet.
When to use
• When you need a quick estimate without spreadsheets.
• When you want privacy — calculations stay on your device.
Limitations
• When you need certified engineering or legal calculations.
• When site-specific conditions require a professional survey.
About this calculator
Estimate wall area, paintable surface after doors and windows, and liters of paint needed based on coverage and coats. Switch between meters and feet.
Frequently asked questions
Is my data uploaded?
No. All math runs locally in your browser.
Is this tool free?
Yes. No account or subscription required.