How to use it
- Choose Women, Men or Kids.
- Pick the sizing system you know: US, UK, EU or foot length in cm.
- Enter the size; the other systems appear instantly.
- Check the size chart, and compare with the brand's own chart before you buy.
Women's shoe size chart
| US women's | UK | EU | Foot length |
|---|---|---|---|
| 4.5 | 2.5 | 35 | 8.6 in (21.8 cm) |
| 5.5 | 3.5 | 36 | 8.9 in (22.5 cm) |
| 6 | 4 | 37 | 9.1 in (23.2 cm) |
| 7 | 5 | 38 | 9.4 in (23.8 cm) |
| 7.5 | 5.5 | 39 | 9.6 in (24.5 cm) |
| 8.5 | 6.5 | 40 | 9.9 in (25.2 cm) |
| 9.5 | 7.5 | 41 | 10.2 in (25.8 cm) |
| 10 | 8 | 42 | 10.4 in (26.5 cm) |
| 11 | 9 | 43 | 10.7 in (27.2 cm) |
Values are calculated from the standard scales and rounded to half sizes. Brands vary, so treat them as a starting point.
Men's shoe size chart
| US men's | UK | EU | Foot length |
|---|---|---|---|
| 6 | 5 | 38 | 9.4 in (23.8 cm) |
| 7.5 | 6.5 | 40 | 9.9 in (25.2 cm) |
| 8.5 | 7.5 | 41 | 10.2 in (25.8 cm) |
| 9 | 8 | 42 | 10.4 in (26.5 cm) |
| 10 | 9 | 43 | 10.7 in (27.2 cm) |
| 10.5 | 9.5 | 44 | 11.0 in (27.8 cm) |
| 11.5 | 10.5 | 45 | 11.2 in (28.5 cm) |
| 12 | 11 | 46 | 11.5 in (29.2 cm) |
| 13 | 12 | 47 | 11.7 in (29.8 cm) |
Women's to men's: the usual rule of thumb in US stores is that women's sizes run about 1.5 sizes larger than men's, so a women's 8.5 is roughly a men's 7. The standard scales used by this converter give a difference of one size, and brands differ. Unisex sneakers are usually labeled in men's sizes.
How the conversion works
All three systems measure the length of the shoe's last (the form it is built on), which is about 1.5 cm (0.6 in) longer than the foot, but they use different units and starting points:
- EU (Paris point): one size = 2/3 cm. EU size = 1.5 × last length in cm.
- UK (barleycorn): one size = 1/3 inch. Adult UK size = 3 × last length in inches − 25.
- US: men's ≈ UK + 1, women's ≈ UK + 2, kids' ≈ UK + 0.5.
Example: a foot of 24.5 cm gives a last of 26 cm. EU = 1.5 × 26 = 39. UK = 3 × (26 ÷ 2.54) − 25 ≈ 5.7, rounded to 5.5, so US women's 7.5 and US men's 6.5.
How to measure your foot
- Stand on a sheet of paper against a wall, heel touching the wall, with your weight on that foot. Wear the socks you will wear with the shoes.
- Mark the tip of your longest toe (not always the big toe).
- Measure from the wall to the mark in inches or centimeters.
- Measure both feet, preferably in the evening when feet are largest, and use the longer one.
Enter the length in centimeters under Foot length (cm) (inches × 2.54). For sneakers and running shoes, many people go half a size up for toe room.
Kids' shoe sizes
US and UK kids' sizes run on their own scale that starts at 0 for babies and goes up to about 13.5. After that, sizes start again from 1 on the adult scale ("big kids" sizes 1–7 in the US, often labeled 1Y–7Y). If your child already wears big kids' sizes, tick The size is already on the adult scale.
| US kids' | UK | EU | Foot length |
|---|---|---|---|
| 4 | 3.5 | 20 | 4.7 in (11.8 cm) |
| 6.5 | 6 | 23 | 5.4 in (13.8 cm) |
| 9 | 8.5 | 26 | 6.2 in (15.8 cm) |
| 11.5 | 11 | 29 | 7.0 in (17.8 cm) |
| 13.5 | 13 | 32 | 7.8 in (19.8 cm) |
| 2 (big kids) | 1 | 33 | 8.1 in (20.5 cm) |
Children's feet grow fast: leave about 1/2 in (1–1.5 cm) of growing room and measure again every few months.
Frequently asked questions
What is a US women's 8 in EU size?
About EU 39–40, depending on the brand. The converter gives 39.5 from the standard scales.
How do I convert women's to men's shoe sizes?
Subtract about 1.5 to 2 sizes: a US women's 9.5 is roughly a men's 8. Choose Women, enter the size, then compare with the men's chart.
What is EU 42 in US size?
About a US men's 9 or a US women's 10.
Why do sizes differ between brands?
Each brand uses its own lasts and fit. The scales here are standard references; always check the brand's own chart.
Should I buy by size or by foot length?
Foot length is the more reliable measure, especially when buying from a brand you have not worn before.
Last updated: November 12, 2026