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Calculator Tools
Door & Window Calculators

Window Area Calculator

Glazed area, frame area and total window area for one or several windows.

Enter values

Results update as you type.

Result

Total window area

6.72 m²

Glazed area
5.2224 m²
Frame area
1.4976 m²
Glazing efficiency
77.7%
Per window
1.68 m²
Perimeter for sealant
20.8 m

About the Window Area Calculator

Glazed area, frame area and total window area for one or several windows.

Also known as: glass area calculator, window square meters, glazing area, window size calculator.

How to use this calculator

  1. Enter window width, window height, number of windows, frame width and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

glazed area = (width − frames) × (height − frames)

Worked example

Using the values pre-filled in the calculator above:

  • Window width = 1,200 mm
  • Window height = 1,400 mm
  • Number of windows = 4
  • Frame width = 60 mm
  • Panes = 2

the calculator returns:

  • Total window area: 6.72 m²
  • Glazed area: 5.2224 m²
  • Frame area: 1.4976 m²
  • Glazing efficiency: 77.7%