Shoe Size Converter - Instant US, UK, EU & JP Conversion
Convert shoe sizes between US, UK, EU & JP instantly. Includes comprehensive charts for men, women & kids. Get accurate conversions for international shopping.
Shoe Size Converter
Convert shoe sizes between different measurement systems
Size Reference Chart
Men's Sizes
| US | UK | EU | JP (cm) | MX | AU |
|---|---|---|---|---|---|
| 6 | 5.5 | 39 | 24 | 4.5 | 5.5 |
| 6.5 | 6 | 39.5 | 24.5 | 5 | 6 |
| 7 | 6.5 | 40 | 25 | 5.5 | 6.5 |
| 7.5 | 7 | 41 | 25.5 | 6 | 7 |
| 8 | 7.5 | 41.5 | 26 | 6.5 | 7.5 |
| 8.5 | 8 | 42 | 26.5 | 7 | 8 |
| 9 | 8.5 | 42.5 | 27 | 7.5 | 8.5 |
| 9.5 | 9 | 43 | 27.5 | 8 | 9 |
| 10 | 9.5 | 44 | 28 | 8.5 | 9.5 |
| 10.5 | 10 | 44.5 | 28.5 | 9 | 10 |
| 11 | 10.5 | 45 | 29 | 9.5 | 10.5 |
| 11.5 | 11 | 45.5 | 29.5 | 10 | 11 |
| 12 | 11.5 | 46 | 30 | 10.5 | 11.5 |
| 12.5 | 12 | 47 | 30.5 | 11 | 12 |
| 13 | 12.5 | 47.5 | 31 | 11.5 | 12.5 |
| 13.5 | 13 | 48 | 31.5 | 12 | 13 |
| 14 | 13.5 | 48.5 | 32 | 12.5 | 13.5 |
| 15 | 14.5 | 49.5 | 33 | 13.5 | 14.5 |
| 16 | 15.5 | 50.5 | 34 | 14.5 | 15.5 |
Women's Sizes
| US | UK | EU | JP (cm) | MX | AU |
|---|---|---|---|---|---|
| 4 | 2 | 35 | 21 | 1.5 | 4 |
| 4.5 | 2.5 | 35.5 | 21.5 | 2 | 4.5 |
| 5 | 3 | 36 | 22 | 2.5 | 5 |
| 5.5 | 3.5 | 36.5 | 22.5 | 3 | 5.5 |
| 6 | 4 | 37 | 23 | 3.5 | 6 |
| 6.5 | 4.5 | 37.5 | 23.5 | 4 | 6.5 |
| 7 | 5 | 38 | 24 | 4.5 | 7 |
| 7.5 | 5.5 | 38.5 | 24.5 | 5 | 7.5 |
| 8 | 6 | 39 | 25 | 5.5 | 8 |
| 8.5 | 6.5 | 39.5 | 25.5 | 6 | 8.5 |
| 9 | 7 | 40 | 26 | 6.5 | 9 |
| 9.5 | 7.5 | 40.5 | 26.5 | 7 | 9.5 |
| 10 | 8 | 41 | 27 | 7.5 | 10 |
| 10.5 | 8.5 | 41.5 | 27.5 | 8 | 10.5 |
| 11 | 9 | 42 | 28 | 8.5 | 11 |
| 11.5 | 9.5 | 42.5 | 28.5 | 9 | 11.5 |
| 12 | 10 | 43 | 29 | 9.5 | 12 |
Children's Sizes
| US | UK | EU | JP (cm) | MX | AU |
|---|---|---|---|---|---|
| 3.5 | 3 | 19 | 9.5 | 2 | 3 |
| 4 | 3.5 | 19.5 | 10 | 2.5 | 3.5 |
| 4.5 | 4 | 20 | 10.5 | 3 | 4 |
| 5 | 4.5 | 21 | 11 | 3.5 | 4.5 |
| 5.5 | 5 | 21.5 | 11.5 | 4 | 5 |
| 6 | 5.5 | 22 | 12 | 4.5 | 5.5 |
| 6.5 | 6 | 23 | 12.5 | 5 | 6 |
| 7 | 6.5 | 23.5 | 13 | 5.5 | 6.5 |
| 7.5 | 7 | 24 | 13.5 | 6 | 7 |
| 8 | 7.5 | 25 | 14 | 6.5 | 7.5 |
| 8.5 | 8 | 25.5 | 14.5 | 7 | 8 |
| 9 | 8.5 | 26 | 15 | 7.5 | 8.5 |
| 9.5 | 9 | 27 | 15.5 | 8 | 9 |
| 10 | 9.5 | 27.5 | 16 | 8.5 | 9.5 |
| 10.5 | 10 | 28 | 16.5 | 9 | 10 |
| 11 | 10.5 | 28.5 | 17 | 9.5 | 10.5 |
| 11.5 | 11 | 29 | 17.5 | 10 | 11 |
| 12 | 11.5 | 30 | 18 | 10.5 | 11.5 |
| 12.5 | 12 | 30.5 | 18.5 | 11 | 12 |
| 13 | 12.5 | 31 | 19 | 11.5 | 12.5 |
| 13.5 | 13 | 32 | 19.5 | 12 | 13 |
Documentation
What Is a Shoe Size Converter?
A shoe size converter turns a shoe size from one national sizing system into the matching size in another. It converts between the four systems used most often in retail: US, UK, EU, and JP (Japan). The tool also converts to Mexican (MX) and Australian (AU) sizes. Shoe size converters exist because no single numbering system is used worldwide, so the same physical shoe carries a different number in each country.
How Shoe Sizing Systems Differ
Each sizing system grew out of a different historical measuring unit, and none of them line up neatly with the others.
- US sizing is based on the barleycorn, an old English unit of one-third of an inch, about 8.5 millimeters (the length of a grain of barley). Each US size step is one barleycorn.
- UK sizing uses the same barleycorn unit as the US system but starts counting from a different point. One UK adult scale covers men and women. A US man's size 12 is a UK man's size 11, one size lower. A UK woman's size 5 is a US size 7, two sizes higher.
- EU sizing is based on the Paris point, a French unit equal to two-thirds of a centimeter (about 6.67 millimeters).
- JP sizing is the simplest of the four: it states foot length directly in centimeters. A UK men's size 9 corresponds to a foot length of 270 mm, which is JP 27.
Because these units are different sizes, EU and JP numbers do not move in step with US and UK numbers. A chart that rounds each value to the nearest half size is easier to use than the underlying equations.
How to Calculate a Shoe Size Conversion
US and UK sizes differ by a fixed number of sizes. EU and JP sizes are worked out from the length of the shoe last (the foot-shaped form a shoe is built on) and from foot length. The converter uses these relations for adult sizes:
- UK size = US men's size − 1
- UK size = US women's size − 2
- Last length (cm) = 2.54 × (UK size + 25) ÷ 3
- EU size = 1.5 × last length (cm), rounded to the nearest half size
- Foot length (cm) = 2.54 × (UK size + 23) ÷ 3
- JP size = foot length (cm), rounded to the nearest 0.5 cm
The EU step is two-thirds of a centimeter and the JP step is half a centimeter. The US and UK step is one-third of an inch. So the EU and JP numbers have no fixed offset from US or UK numbers.
The same UK size gives the same EU and JP size for men and women. A UK woman's size 8 is EU 42, and the formula gives 1.5 × 27.94 = 41.9, which rounds to 42.
Children's sizes use a separate table. Measured from the US number:
- UK size = US size − 0.5
- JP size (cm) = US size + 6
- EU size has no single fixed offset, so a chart gives the exact value.
Example
Convert a men's US size 9 to UK, EU, and JP.
- UK: 9 − 1 = 8
- Last length: 2.54 × (8 + 25) ÷ 3 = 27.94 cm, so EU = 1.5 × 27.94 = 41.9, which rounds to EU 42
- Foot length: 2.54 × (8 + 23) ÷ 3 = 26.25 cm, which rounds to JP 26
Shoe Size Conversion Charts
Men's Shoe Sizes (US, UK, EU, JP)
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 6 | 5 | 38 | 23.5 |
| 6.5 | 5.5 | 38.5 | 24 |
| 7 | 6 | 39.5 | 24.5 |
| 7.5 | 6.5 | 40 | 25 |
| 8 | 7 | 40.5 | 25.5 |
| 8.5 | 7.5 | 41.5 | 26 |
| 9 | 8 | 42 | 26 |
| 9.5 | 8.5 | 42.5 | 26.5 |
| 10 | 9 | 43 | 27 |
| 10.5 | 9.5 | 44 | 27.5 |
| 11 | 10 | 44.5 | 28 |
| 11.5 | 10.5 | 45 | 28.5 |
| 12 | 11 | 45.5 | 29 |
| 12.5 | 11.5 | 46.5 | 29 |
| 13 | 12 | 47 | 29.5 |
| 13.5 | 12.5 | 47.5 | 30 |
| 14 | 13 | 48.5 | 30.5 |
| 15 | 14 | 49.5 | 31.5 |
| 16 | 15 | 51 | 32 |
Women's Shoe Sizes (US, UK, EU, JP)
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 4 | 2 | 34.5 | 21 |
| 4.5 | 2.5 | 35 | 21.5 |
| 5 | 3 | 35.5 | 22 |
| 5.5 | 3.5 | 36 | 22.5 |
| 6 | 4 | 37 | 23 |
| 6.5 | 4.5 | 37.5 | 23.5 |
| 7 | 5 | 38 | 23.5 |
| 7.5 | 5.5 | 38.5 | 24 |
| 8 | 6 | 39.5 | 24.5 |
| 8.5 | 6.5 | 40 | 25 |
| 9 | 7 | 40.5 | 25.5 |
| 9.5 | 7.5 | 41.5 | 26 |
| 10 | 8 | 42 | 26 |
| 10.5 | 8.5 | 42.5 | 26.5 |
| 11 | 9 | 43 | 27 |
| 11.5 | 9.5 | 44 | 27.5 |
| 12 | 10 | 44.5 | 28 |
Children's Shoe Sizes (US, UK, EU, JP)
| US | UK | EU | JP (cm) |
|---|---|---|---|
| 3.5 | 3 | 19 | 9.5 |
| 4 | 3.5 | 19.5 | 10 |
| 4.5 | 4 | 20 | 10.5 |
| 5 | 4.5 | 21 | 11 |
| 5.5 | 5 | 21.5 | 11.5 |
| 6 | 5.5 | 22 | 12 |
| 6.5 | 6 | 23 | 12.5 |
| 7 | 6.5 | 23.5 | 13 |
| 7.5 | 7 | 24 | 13.5 |
| 8 | 7.5 | 25 | 14 |
| 8.5 | 8 | 25.5 | 14.5 |
| 9 | 8.5 | 26 | 15 |
| 9.5 | 9 | 27 | 15.5 |
| 10 | 9.5 | 27.5 | 16 |
| 10.5 | 10 | 28 | 16.5 |
| 11 | 10.5 | 28.5 | 17 |
| 11.5 | 11 | 29 | 17.5 |
| 12 | 11.5 | 30 | 18 |
| 12.5 | 12 | 30.5 | 18.5 |
| 13 | 12.5 | 31 | 19 |
| 13.5 | 13 | 32 | 19.5 |
This chart covers children's sizes from US 3.5 up to US 13.5, which is the standard "little kids" and "big kids" range. Sizes below US 3.5 (infant and toddler sizes) use a separate numbering system not covered by this converter.
Mexican and Australian Shoe Sizes
Mexico and Australia each use their own conventions, which this converter also supports.
- Mexican (MX) sizes run smaller than US sizes and half a size below UK sizes. For men, MX size equals the US size minus 1.5 (a US 9 is an MX 7.5). For women, MX size equals the US size minus 2.5 (a US 8 is an MX 5.5).
- Australian (AU) sizes follow different rules for each group. Men's and children's AU sizes match UK sizes exactly. Women's AU sizes match US sizes exactly (a women's US 8 is also an AU 8).
Factors That Affect Fit Beyond the Size Number
A converted size is a starting point, not a guarantee of fit, for several reasons.
- Brands differ. Two shoes labeled the same size from different manufacturers can measure differently inside.
- Width is separate from length. Most size charts, including this one, measure length only. US width is marked with letters such as B, D, and EE; a narrow and a wide foot can share the same length size but need different width fits.
- Rounding varies. Manufacturers round between systems in slightly different ways, which is why two charts for the same brand can disagree by half a size.
Measuring foot length directly gives the most reliable starting size. Stand on a sheet of paper with a heel against a wall, mark the tip of the longest toe, then measure the distance from the wall to the mark in millimeters. Measuring in the afternoon is more accurate, since feet swell slightly over the course of a day.
Frequently Asked Questions
What is a US men's 9 in EU sizing? A men's US size 9 equals UK 8, EU 42, and JP 26 cm.
How do I convert a US shoe size to UK? Subtract 1 for men's sizes, subtract 2 for women's sizes, and subtract 0.5 for children's sizes. US men's and women's scales start from different points, so the chart for the correct group gives the right answer.
Is a Japanese shoe size the same as a foot length in centimeters? Yes. JP sizing states foot length in centimeters directly, so a JP 25 fits a 25-centimeter foot with no further conversion needed.
Do shoe sizes vary between brands even within the same system? Yes. A size 9 from one brand can fit differently than a size 9 from another, because manufacturers use different internal forms, called lasts, to shape their shoes. A conversion chart gives a standard starting point; brand-specific size guides and customer reviews refine it further.
Does this converter support Mexican or Australian sizes? Yes. Selecting MX or AU as the source or target system applies the offsets described above: MX runs smaller than US, AU men's and children's sizes match UK, and AU women's sizes match US.
What should I do if a converted size doesn't fit? Recheck the foot measurement first. If the measurement is correct, the mismatch is likely a brand-specific fit difference rather than a conversion error. Checking the manufacturer's own size guide, when available, is the next step.
References
- SATRA Technology. The diversity of footwear sizing systems. The diversity of footwear sizing systems — barleycorn of about one-third of an inch; continental (Paris point) full size of 2/3 cm; US men 12 = UK men 11; UK women 5 = US women 7; UK women 8 = EU 42; UK men 9 = Mondopoint 270 mm.