basic

Wall Paint Area Minus Doors and Windows Calculator

Net paintable area and litres of paint needed.

Calculates the net wall area = perimeter × height − (doors + windows area). Then estimates litres needed = net area × coats / coverage (m²/L).

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

m
m
m²
m²/L

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Net area = P×H − openings; Litres = Net × coats / coverage

In depth

Calculates the net wall area = perimeter × height − (doors + windows area). Then estimates litres needed = net area × coats / coverage (m²/L).