US Women's to UK Size Converter
Convert US Women's (US W) to UK Size (UK) instantly. Formula: UK = US W × -1.
Shoe Size Converter
4 units available
1 US W = -1 UK
Formula:
UK = US W × -1With your value: 1 US W = -1 UK
Other US Women's to UK Size conversions
US Women's to UK Size Conversion Table
| US Women's (US W) | UK Size (UK) |
|---|---|
| 0.5 | -1.5 |
| 1 | -1 |
| 2 | 0 |
| 5 | 3 |
| 10 | 8 |
| 15 | 13 |
| 20 | 18 |
| 25 | 23 |
| 50 | 48 |
| 100 | 98 |
| 250 | 248 |
| 500 | 498 |
| 1000 | 998 |
UK Size to US Women's Conversion Table
| UK Size (UK) | US Women's (US W) |
|---|---|
| 0.5 | 2.5 |
| 1 | 3 |
| 2 | 4 |
| 5 | 7 |
| 10 | 12 |
| 15 | 17 |
| 20 | 22 |
| 25 | 27 |
| 50 | 52 |
| 100 | 102 |
| 250 | 252 |
| 500 | 502 |
| 1000 | 1,002 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
US Women's (US W)
Shoe Size
Only Mondopoint (ISO 9407) is defined from foot length in millimetres. US, UK and EU scales are trade conventions.
Manufacturer lasts differ. Treat cross-system results as a starting point, not a guaranteed fit.
Source: ISO 9407:2019, Footwear sizing — Mondopoint system
International Organization for Standardization · Reviewed 2026-07-01
UK Size (UK)
Shoe Size
Only Mondopoint (ISO 9407) is defined from foot length in millimetres. US, UK and EU scales are trade conventions.
Manufacturer lasts differ. Treat cross-system results as a starting point, not a guaranteed fit.
Source: ISO 9407:2019, Footwear sizing — Mondopoint system
International Organization for Standardization · Reviewed 2026-07-01
How to Convert US Women's to UK Size
This conversion uses an offset formula, so it cannot be described by a single multiplication factor.
Formula: UK = US W × -1
Reverse: US W = UK × 3
Step-by-Step Example
- Start with your value in US Women's. For example: 5 US W
- Apply UK = US W × -1
- The result is: 3 UK
About US Women's
The us women's (US W) is a unit of footwear sizing. The us women's scale is offset from the centimetre of foot length scale, so converting it requires both a factor and an offset rather than a single multiplier. UnitConvertLab converts it against every other shoe size unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
Common uses: shoe size calculations, engineering and science, education.
About UK Size
UK shoe sizes are based on the length of the last, measured in barleycorns (1/3 inch).
Common uses: shoe shopping (UK), international sizing.
Frequently Asked Questions
How many UK Size are in 1 US Women's?
There are exactly -1 UK Size in 1 US Women's.
What is the formula to convert US Women's to UK Size?
The formula to convert US Women's to UK Size is: UK = US W × -1. For example, to convert 10 US Women's to UK Size, you would apply the formula to 10.
What is a US Women's?
The us women's (US W) is a unit of footwear sizing. The us women's scale is offset from the centimetre of foot length scale, so converting it requires both a factor and an offset rather than a single multiplier. UnitConvertLab converts it against every other shoe size unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.
What is a UK Size?
UK shoe sizes are based on the length of the last, measured in barleycorns (1/3 inch).
What are the common uses of US Women's?
The US Women's is commonly used in shoe size calculations, engineering and science, education.
Related Shoe Size Conversions
Cite this page
UnitConvertLab. (2026). US Women's to UK Size converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/shoe_us_women-to-shoe_uk