Why do I need to know the total glass area?

Total glass area helps you estimate cleaning time, solution requirements and accurate job pricing. Many window cleaners quote based on area (£/m²) rather than per window. Knowing the exact area prevents under-quoting large windows or over-charging for small ones.

How do I measure window glass area?

Measure the width and height of the glass pane only (not the frame) in centimetres. For windows with multiple panes, measure one pane and multiply by the count. Use a laser measure for accuracy on larger windows or those that are difficult to reach.

What is the average window size in UK homes?

Standard UK window sizes vary but common dimensions include: bedroom windows 120cm × 120cm, bathroom windows 60cm × 90cm, living room windows 180cm × 120cm, and patio doors 180cm × 210cm. Victorian and Edwardian properties often have non-standard sizes.

How much should I charge per square metre of glass?

Typical UK window cleaning rates are £2-5 per m² for residential and £3-8 per m² for commercial. First cleans with heavy contamination may be charged at 2-3 times the normal rate. Factor in access difficulty, height, and frequency when setting prices.

CleanCalcs

Glass Area Calculator

Calculate total glass area from window dimensions and quantities.

Window Group 1

Width

Height

Count

Window Group 2 (optional)

Width

Height

Count

Window Group 3 (optional)

Width

Height

Count

How We Calculate This

How the calculation works

Glass area is calculated from window width and height, then multiplied by the number of panes.

Formula

Area per pane = (width cm ÷ 100) × (height cm ÷ 100) = m²

Group subtotal = area per pane × number of panes

Total area = sum of all group subtotals

You can enter up to 3 different window sizes. Leave unused groups blank.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities and timings for your specific situation.