About this calculator
Estimate litres of wall paint based on room dimensions, openings, coats and coverage.
Check the actual coverage printed on your paint tin.
Formula
Wall area = 2 × (length + width) × height − openings. Litres = wall area × coats ÷ coverage.
Example
A 4m × 3m × 2.4m room has 33.6m² wall area before openings.
Accuracy
NUMTX shows the assumptions next to the calculation so you can replace defaults with values that match your situation. For measurements, supplier rates, fees, interest, tax or regulated work, confirm important figures with the appropriate official or professional source.