Window Glass Area Calculator
Work out total glass area from window size and count.
Quick answer: enter your details below and click Calculate Glass Area — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Measure one window's width and height in metres.
- Enter how many windows share that size.
- Click Calculate Glass Area.
About this tool
Enter the width and height of one window and how many windows share that size, and the tool gives the glass area per window and the total. It is a handy figure for ordering film, estimating cleaning, or comparing glazing quotes.
Frequently asked questions
What if windows differ in size?
Run the tool once per size and add the totals together.
Is this the same as glazing area for quotes?
It is a close planning figure, but a glazier measures each opening on site before ordering.