US to UK women's shoe size converter
Enter your US women's size to get the UK number to order.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter us women's size.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Foot length (in) = (US women's + 20.5) ÷ 3, then UK = 3 × foot length (in) - 23, with 1 in = 2.54 cm. The result is rounded to the nearest half size, following the ISO/TS 19407 formulas.
Example
Inputs: US women's size = 8. Result: UK size: 5.5; Exact value before rounding: 5.5; Approximate foot length: 24.1 cm.
Limits and caveats
- Brands and models can differ from this chart by up to one size, so check the brand's own chart when you have it.
- Based on the ISO/TS 19407 formulas; US women's sizes follow the common scale (men's + 1.5).
- Foot width and shape are not taken into account.
Questions about this tool
What is US women's 8 in UK sizes?
It is UK 5.5 using the ISO/TS 19407 formulas; the exact value before rounding is 5.5, which fits a foot of about 24.1 cm.
Why does a brand's chart differ from this US women's to UK result?
Each brand rounds its sizes and builds its lasts its own way, so its chart can be up to one size off. Measuring your foot in cm is the most reliable check.
Why is the gap 2.5 sizes for women?
US women's sizes run 1.5 above US men's, and US men's run 1 above UK, giving 2.5. Some brands use a gap of 2 instead.