Curtains & Windows

Window Area Calculator

Calculate glazing and frame-opening area for film, blinds, or treatment quotes.

Free interactive tool

Enter your details

m
m
Method & guidance

How the Window Area Calculator works

Window width × height × quantity gives total window area.

How to use this tool

  1. Collect accurate values for window width, window height, matching windows.
  2. Enter measurements in the displayed units and select the choices that match this project.
  3. Select Calculate / Generate, then compare the outputs with the stated Window Area Calculator method.
  4. Apply the result only after checking product specifications and real site conditions.

Example calculation or use case

For a worked Window Area Calculator example, use Window width = 1.2 m, Window height = 1.5 m, Matching windows = 2. The tool then applies this method: Window width × height × quantity gives total window area.

Frequently Asked Questions

What information does the Window Area Calculator use?

It uses the measurements and choices shown in the form. Window width × height × quantity gives total window area.

How accurate is the Window Area Calculator result?

The calculation is mathematically consistent with the stated assumptions. Measure each non-identical opening separately, especially in older homes. Real products, site conditions, and supplier specifications can still change the final decision.

Should I include an allowance?

Use the result as a planning baseline and keep a sensible reserve for site variation, delivery, or fitting.

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