Shoe Size Conversion Calculator
A pair of shoes can carry three different numbers depending on where it was made, which makes ordering from abroad a guessing game without a conversion. This calculator turns a US women's shoe size into its standard UK and EU equivalents so you can match a label across regions. You enter your US size, and it returns the UK and EU numbers using the offsets that follow the standard last-length steps, where the last is the foot-shaped form a shoe is built around. The rules are short: the UK size is the US size minus 2, and the EU size is the US size plus 31, which is why a US 8 maps to a UK 6 and an EU 39. The systems differ because each region starts its count at a different point on the last length. Half sizes carry through the same way, so a US 8.5 becomes a UK 6.5 and roughly an EU 39.5. These conversions get you close, but foot width and how a shoe is cut both affect fit, so for fit-critical buys measure your foot length and check the brand's own chart. Every figure here is computed deterministically, and the worked example below reconciles exactly to the calculator.
For women's shoes, UK = US - 2 and EU = US + 31. A US 8 converts to a UK 6 and an EU 39.
Shoe size conversion formula
UK = US - 2
EU = US + 31
US = US women's shoe size
offsets follow the standard last-length steps
Each region counts from a different starting point on the same shoe last, so a fixed offset converts between the scales. Half sizes carry through unchanged.
Worked example
Convert a US women's size 8.
- UK: 8 - 2 = 6
- EU: 8 + 31 = 39
A US 8 is a UK 6 and an EU 39. These are the calculator's default inputs, so the result above matches the widget exactly.
Women's shoe size table
| US | UK | EU |
|---|---|---|
| 6 | 4 | 37 |
| 7 | 5 | 38 |
| 8 | 6 | 39 |
| 9 | 7 | 40 |
| 10 | 8 | 41 |
Measurement and sizing standards: US National Institute of Standards and Technology (NIST).
Shoe size conversion calculator: frequently asked questions
How do I convert a US women's shoe size to UK and EU?
For women's shoes, the UK size is the US size minus 2, and the EU size is the US size plus 31. A US 8 is a UK 6 and an EU 39. These offsets follow the standard last-length steps used across the size range, though brands vary slightly.
Why are shoe sizes different across regions?
Each region scales shoe size from the length of the shoe last, the foot-shaped form a shoe is built on, but starts the count at a different point and uses different step sizes. That is why the same shoe carries three different numbers in the US, UK and EU systems.
Should I measure my foot instead of converting?
For the best fit, yes. Measure your foot length in millimeters and match it to a brand's size chart. Conversions get you close, but foot shape, width and how a particular shoe is cut all matter. Use the converted size as a starting point, then check the maker's chart.
Do these offsets work for men's shoes?
No. Men's shoes use different offsets, typically UK equals US minus 1 and EU equals US plus about 33. This calculator is set up for women's sizing, where the minus 2 and plus 31 steps apply. Convert men's sizes with a men's chart instead.
What about half sizes?
Half sizes carry through the conversion the same way, so a US 8.5 becomes a UK 6.5 and an EU of about 39.5, often rounded to 40 by brands that do not use half sizes. Enter your half size directly and the offsets still apply.
Official sources
- Measurement, sizing and standards reference: US National Institute of Standards and Technology (NIST). As at 25 June 2026.
Reviewed by the CalculatorHub team, edited by James Graham, 25 June 2026. See our methodology. This is general information, not financial, tax, legal or investment advice.