Shoe Size Converter - Convert US, UK, EU & Asian Sizes
Convert shoe sizes between US, UK, EU, and Asian systems instantly. Accurate conversions for men's, women's, and kids' footwear with comprehensive size charts.
International Shoe Size Converter
Convert shoe sizes between different international systems
From Size
Valid range: 3 to 16
To Size
Valid range: 35 to 50.5
Size Chart
| US Men | US Women | UK | EU | CM | Australia (Men) | Japan |
|---|---|---|---|---|---|---|
| 7 | 8.5 | 6.5 | 40 | 25.0 | 6.5 | 25.0 |
| 8 | 9.5 | 7.5 | 41 | 26.0 | 7.5 | 26.0 |
| 9 | 10.5 | 8.5 | 42.5 | 27.0 | 8.5 | 27.0 |
| 10 | 11.5 | 9.5 | 44 | 28.0 | 9.5 | 28.0 |
| 11 | 12.5 | 10.5 | 45 | 29.0 | 10.5 | 29.0 |
| 12 | 13.5 | 11.5 | 46 | 30.0 | 11.5 | 30.0 |
| 13 | 14.5 | 12.5 | 47.5 | 31.0 | 12.5 | 31.0 |
This chart shows approximate conversions between different shoe sizing systems.
Documentation
What is a shoe size converter?
A shoe size converter is a tool that changes a shoe size from one national or regional sizing system into another, such as from UK sizes to EU sizes. It exists because countries measure and label shoe sizes in different ways, so the same foot length can carry a different number in each system.
Shoe sizing systems
- US men's: commonly ranges from about size 6 to 16, with half sizes available.
- US women's: uses the same length scale as US men's but shifted by 1.5 sizes.
- UK: used in the United Kingdom and, with minor differences, in Australia.
- EU: used across continental Europe, based on the Paris point scale (two-thirds of a centimeter per size step). It is unisex; the same number is used for men's and women's shoes.
- CM: the length of the foot in centimeters. Japan labels shoes this way, and it is also used in the Mondopoint system, an international standard for foot measurement.
How to calculate a shoe size conversion
Most conversion charts treat the US men's size as the reference point and apply a fixed offset for other systems. These offsets hold across the whole adult size range:
- US women's size = US men's size + 1.5
- UK size = US men's size − 0.5
- Australian size (men's) = UK size
- CM (foot length) = US men's size + 18
Reversed, the last relationship gives a foot length in centimeters:
- US men's size = CM − 18
EU sizing does not follow one of these fixed offsets. Its relationship to the other systems is irregular, so EU sizes are best found with a reference table rather than a single formula.
Example
A foot that measures 27 cm converts to a US men's size with the CM formula:
27 − 18 = 9
A 27 cm foot is a US men's size 9. Checking a reference table shows the same size is UK 8.5, EU 42.5, and Australian 8.5.
For a size already known in one system, the table can be read directly. A US men's size 10 shoe is EU size 44 and UK size 9.5.
Shoe size conversion chart
| US Men | US Women | UK | EU | CM | Australia |
|---|---|---|---|---|---|
| 6 | 7.5 | 5.5 | 39 | 24 | 5.5 |
| 7 | 8.5 | 6.5 | 40 | 25 | 6.5 |
| 8 | 9.5 | 7.5 | 41 | 26 | 7.5 |
| 9 | 10.5 | 8.5 | 42.5 | 27 | 8.5 |
| 10 | 11.5 | 9.5 | 44 | 28 | 9.5 |
| 11 | 12.5 | 10.5 | 45 | 29 | 10.5 |
| 12 | 13.5 | 11.5 | 46 | 30 | 11.5 |
| 13 | 14.5 | 12.5 | 47.5 | 31 | 12.5 |
| 14 | 15.5 | 13.5 | 48.5 | 32 | 13.5 |
| 15 | 16.5 | 14.5 | 49.5 | 33 | 14.5 |
| 16 | 17.5 | 15.5 | 50.5 | 34 | 15.5 |
Half sizes fall between these rows in most systems.
Why converted sizes don't always fit
A converted size is a starting point, not a guarantee of fit. Shoe length varies between brands even inside the same sizing system, and shoe style changes the fit too: running shoes often fit snugger than casual shoes, and boots may need extra room. Most sizing systems also describe length only. Width, labeled with letters such as B, D, or EE in the US system, is left out of nearly every international size chart.
Frequently asked questions
What is the difference between US and UK shoe sizes? UK sizes run about half a size smaller than US men's sizes for the same foot length. A US men's 10 is close to a UK 9.5.
Why do US men's and women's sizes differ by 1.5? The gap comes from a numbering convention set when shoe manufacturing became standardized in the early 1900s, not from a difference in foot shape. A US women's size equals a US men's size plus 1.5.
How do I find my shoe size from a foot measurement in centimeters? Subtract 18 from the foot length in centimeters to get the US men's size. A 28 cm foot, for example, gives 28 − 18 = 10.
Are children's shoe sizes converted the same way as adult sizes? No. Children's sizing uses separate scales with their own numbering, so adult conversion offsets do not apply.
Why doesn't a converted size always fit correctly? Sizing varies between brands and shoe styles even within one system, and most systems leave out width. A converted size is a reliable estimate, not an exact fit.
References
- International Organization for Standardization. (2019). ISO 9407:2019 Shoe sizes — Mondopoint system of sizing and marking. https://www.iso.org/standard/73758.html
- British Standards Institution. (2011). BS 4981:2011 Specification for size designation of footwear.
- European Committee for Standardization. (2017). EN 13402-3:2017 Size designation of clothes — Part 3: Measurements and intervals. https://standards.cen.eu/
- Japanese Industrial Standards Committee. (2005). JIS S 5037:2005 Sizing system for footwear.