How to use this tool
Enter the total wall area, subtract openings and choose the number of coats.
Use the paint manufacturer's coverage and container size. The tool adds waste before rounding to containers.
Litres = (wall area−openings) × coats / coverage × (1+waste)
Worked example
11.44 L · paint estimate
Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.
Example inputs
- Total wall area (m²): 60
- Unpainted openings (m²): 8
- Coats: 2
- Coverage (m² per litre per coat): 10
- Waste allowance (%): 10
- Container size (litres): 2.5
- Price per container: 30
Method illustration: 52 m² over two coats at 10 m²/L uses 10.4 L before waste.
Assumptions and limits
- Estimates material quantities only, not structural adequacy or code compliance. Verify measurements and manufacturer coverage/yield.
- Waste is added before rounding to whole packages. Material costs exclude delivery, labor and tax unless included in entered prices.
Check or report a result
Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.
Report a calculation issue with the page address, hypothetical inputs, result displayed and result expected. Do not include passwords, bank details or other private information.