materials
Wall Area Calculator
Find gross and net paint or plaster area after deducting doors and windows.
Net wall area
36 m²
Gross area
42 m²
Openings deducted
6 m²
How this works
Net wall area = total wall length × height − opening area.
Worked example
Fifteen metres of wall at 2.8 m high, less 6 m² of openings, gives 36 m² net area.
FAQ
What is the Wall Area Calculator used for?
Find gross and net paint or plaster area after deducting doors and windows. It is intended for quick planning, checking, and everyday decisions.
Can I use the result for a final contract or design?
Use it as a planning estimate. Measure both faces separately when finishes differ.
How can I improve the accuracy?
Use measured quantities, current supplier or lender rates, the correct units, and compare the result with drawings, invoices, or professional advice where the decision is safety-critical.