Wall area after openings calculator UK
Measure rectangular wall area and subtract the total doors and windows you supply. Check the formula, worked example and limits before using your own figures.
Enter your figures
Net wall area
Inputs changed. Select Calculate result to update your estimate.
Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Rectangular walls at one height. Returns, reveals, sloped ceilings and surfaces needing different treatment should be measured separately.
How the wall area after openings calculator uk works
Net area = combined wall length × height − opening area.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: wall area after openings
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Combined wall length (m)
- 16
- Wall height (m)
- 2.4
- Total opening area (m²)
- 5
Net wall area: 33.4 m²
Net area = combined wall length × height − opening area.
Wall area after openings: questions answered
What does the wall area after openings calculation include?
Net area = combined wall length × height − opening area. Use your actual figures. Any prefilled price, fee, rate or return is an editable illustration, not a current product quote. Rectangular walls at one height. Returns, reveals, sloped ceilings and surfaces needing different treatment should be measured separately.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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