Shoe Size Converter – US, UK, EU and CM in 3 Easy Steps
Shoe Size Converter
Use this shoe size converter: type a value into any field to instantly convert across global footwear sizing systems.
Use this free shoe size converter to switch adult shoe sizes between US, UK, European (EU) and centimetre (Japan / Mondopoint) sizing. Type a size into any box and the other three update instantly, with a quick reference chart for common men’s and unisex sizes.
Quick answer
This converter uses the common men’s and unisex scale: UK = US − 1, foot length in cm = US + 18, and EU = 1.5 × US + 28.5. So US 9 is UK 8, EU 42 and about 27 cm, and a 26 cm foot is about US 8, UK 7 and EU 40.5. For women’s shoes, the US size is usually about 1.5 higher than the men’s US size for the same foot.
Table of Contents
Shoe sizes change across borders. A US 9 is a UK 8, an EU 42 and a 27 in Japan, and brands do not always agree on the exact steps between sizes.
This shoe size converter gives you a clear starting point in all four systems, so ordering trainers or boots from another country is less of a gamble.
Shoe Size Formulas Used
- UK = US − 1
- CM (foot length) = US + 18
- EU = 1.5 × US + 28.5
- US from cm = cm − 18
- Real shoe sizes come in half steps, so round to the nearest half size.
Men’s and Unisex Shoe Size Chart
| US | UK | EU | CM (Japan) |
|---|---|---|---|
| 6 | 5 | 37.5 | 24 |
| 7 | 6 | 39 | 25 |
| 8 | 7 | 40.5 | 26 |
| 9 | 8 | 42 | 27 |
| 10 | 9 | 43.5 | 28 |
| 11 | 10 | 45 | 29 |
| 12 | 11 | 46.5 | 30 |
| 13 | 12 | 48 | 31 |
How to Use the Shoe Size Converter
Step 1: Enter Your US Size
Type your size in US Size. A US 9 shows UK 8, EU 42 and 27 cm.
Step 2: Convert From Your Foot Length in CM
Measure your foot and type the length in Centimeters (Japan). A 26 cm foot gives US 8, UK 7 and EU 40.5. Japanese and many sports brands label shoes by this centimetre size.
Step 3: Check the Standard Reference Matrix
The Standard Reference Matrix lists popular sizes at a glance: US 7, 9, 11 and 13 with their UK, EU and centimetre equivalents. Press Clear Fields to start over.
How to Measure Your Foot
- Stand on a sheet of paper with your heel against a wall, in the socks you plan to wear.
- Mark the tip of your longest toe.
- Measure from the wall to the mark in centimetres.
- Measure both feet and use the longer one, ideally in the evening when feet are slightly larger.
Women’s and Kids’ Sizes
Women’s US sizes run about 1.5 sizes higher than men’s for the same foot, so a women’s US 8.5 is close to a men’s US 7. UK sizes are the same for men and women. Kids’ sizes use a separate scale, so check a children’s chart for young feet.
Why Size Charts Disagree
There is no single global standard that every brand follows. US and UK sizes are based on an old barleycorn unit of one third of an inch, EU sizes use the Paris point of two thirds of a centimetre, and Japan uses the foot length directly. Converting between them always involves rounding, which is why one brand’s EU 42 can be another’s 42.5. Use the shoe size converter to get close, then fine-tune with the brand chart.
Tips for Buying Shoes Online
- Check the brand’s own size chart, especially for European and Asian brands.
- Running shoes often fit half a size small; many runners size up.
- Boots and formal shoes may run large; read customer reviews.
- Wide feet may need a wide fit (E or 2E) rather than a larger size.
More size tools: the Clothing Size Converter, the Ring Size Calculator and the Length Converter.
Frequently Asked Questions
What is US 9 in EU shoe size?
A men’s US 9 is about EU 42 and UK 8.
How do I convert UK to US shoe size?
For men’s and unisex shoes, add 1 to the UK size. UK 8 is US 9.
What shoe size is 26 cm?
A 26 cm foot is about men’s US 8, UK 7 and EU 40.5.
Are women’s and men’s US sizes the same?
No. Women’s US sizes are about 1.5 higher than men’s for the same foot length.
Should I round up or down between sizes?
Most people round up to the next half size for comfort, especially for sports shoes.
Is my data stored?
No. The shoe size converter runs in your browser and nothing is saved.