What the Window Area Calculator actually calculates
Width times height gives one rectangular window area; quantity multiplies it for identical windows. The engine cannot distinguish glazing from frame area and does not deduct mullions, add film trimming margins, or determine blind order dimensions. Measure the surface relevant to the work.
The calculation path
Window width × height × quantity gives total window area.
Inputs that can change the answer
- Window width: Enter window width in m.
- Window height: Enter window height in m.
- Matching windows: Enter matching windows as a number; use the definition in the calculation method.
Checks that stay outside the formula
Measure each non-identical opening separately, especially in older homes.
A practical order for entering the data
- Decide whether the job needs glass dimensions or the full frame opening dimensions.
- Measure that rectangle's width and height in metres and enter the number of matching windows.
- Use the single and combined areas for the same measurement basis when requesting quotes.
Engine check using the prefilled sample
Window-treatment example: window width = 1.2 m, window height = 1.5 m and matching windows = 2. Replace the sample opening and fabric or hardware values with measurements taken for the mounting method you plan to use.
Results for these inputs
- Area per window
- 1.80 m²
- Total window area
- 3.60 m²