Convert your shoe size between US (men/women/kids), UK, EU and Japanese sizing — or enter your foot length to find all sizes at once.
EU
42
UK
8.3
JP / cm
26.5
Calculator
Your sizes
EU 42
US Men
9.3
UK
8.3
JP / cm
26.5
EU
42
US Men
9.3
UK
8.3
JP / cm
26.5 cm
Foot length
265 mm
Sizes vary by brand and last shape — always measure your foot and try before you buy.
How shoe sizing works
The ISO 9407 Mondopoint system uses foot length in mm as its universal base. EU (European) sizes use the Paris-point system: the last length (foot + ~15 mm shoe allowance) in units of 2/3 cm. US and UK sizes use the barleycorn (1/3 inch) scale applied directly to foot length — US men's start 1 size above UK; women's run 1.5 sizes above the men's equivalent.
Japanese sizes follow Mondopoint exactly (foot length in cm). Because manufacturers apply different allowances and lasts, the same foot will often fit ½–1 size differently across brands. When in doubt, measure your foot on a flat surface from heel to longest toe, then use the computed values as a starting point.
How do I convert EU shoe size to US?
There is no fixed one-to-one mapping because EU and US systems use different measurement bases. This converter uses the standard barleycorn formula: EU size comes from last length (foot + ~15 mm); US men's size = 3 × (foot length in inches) − 22. For a rough rule of thumb, subtract 33–34 from your EU size to get approximate US men's size.
What is Mondopoint / JP sizing?
Mondopoint is the ISO 9407 international standard that expresses shoe size directly as foot length in mm (or cm for Japanese sizing). It is the only system with a globally unambiguous value. JP size 26 = Mondopoint 260 mm foot length.
Why are men's, women's and kids' sizes different?
US men's and women's sizes use the same barleycorn scale but different zero points: women's are offset ~1.5 sizes above men's for the same foot length. Kids' (US) use a separate scale that starts lower. EU and UK sizes are gender-neutral — only the US series differs by gender.
Results are estimates. Verify with a professional for important decisions.
About this calculator
This converter translates your shoe size across US (men, women and kids), UK, EU and Japanese (JP/Mondopoint) systems in a single step. Enter your foot length in millimetres, centimetres or inches — or start from a known size in any system — and the calculator shows the equivalent in every other system at once.
How to read your results
Each result row shows the rounded or half-size value standard for that system. The Mondopoint column is the raw foot length in millimetres and serves as the universal anchor. Shoe sizing varies significantly by brand and last; cross-system conversions are approximate — always check the maker's size chart.
Worked example
Enter a foot length of 270 mm and select Men's. The converter uses the barleycorn-based formula for US and UK, the Paris-point formula for EU, and the direct millimetre-to-centimetre conversion for JP.
US men 9.9 · UK 8.9 · EU 42.8 · JP 27.0 cm · Mondopoint 270 mm. Rounding to half sizes: US men 10, UK 9, EU 43, JP 27.
Frequently asked questions
Why do US men's and US women's sizes differ for the same foot?
US women's sizes run approximately 1.5 sizes higher than men's for the same foot length. A man with a 270 mm foot wears a US 10 (men's), while a woman with the same foot length wears roughly a US 11.5 (women's). The offset is a historical convention, not a physical difference.
What is a Paris point, and why does EU sizing use it?
A Paris point is 2/3 of a centimetre (approximately 6.67 mm). The EU (or French) system sizes shoes by the length of the shoe last — the foot-shaped mould — rather than the foot itself. The last is typically about 15 mm longer than the foot, so EU sizes run slightly higher than a direct foot-length ratio would suggest.
What is Mondopoint?
Mondopoint (ISO 9407) is an international metric standard that expresses shoe size directly as foot length in millimetres (sometimes also width). Japan's sizing system follows the same principle in centimetres. Because it uses an absolute measurement, Mondopoint removes most of the ambiguity between national systems.
How accurate are the converted sizes?
The formulas follow the barleycorn (US/UK) and Paris-point (EU) models described in ISO 9407 and the Wikipedia "Shoe size" article. They give good approximations, but brands regularly deviate from nominal sizing — a EU 43 from one maker may fit differently from a EU 43 from another. Treat the results as a starting guide and consult the brand's fit chart before purchasing.
Can I convert kids' sizes the same way?
Yes. Select "Kids" and enter the foot length (or a known kids' size). Kids' US sizes use a separate barleycorn scale that starts lower than the adult scale, so the formula is US kids = 3 × (foot in inches) − 10. UK kids' sizes parallel the US kids' scale with a one-size offset, and EU and JP follow the same adult formulas.
How it's calculated
All conversions are routed through foot length in millimetres as a common intermediate. For US men's, the barleycorn formula applies: US men = 3 × (foot mm ÷ 25.4) − 22, where each size increment is one barleycorn (one-third of an inch ≈ 8.47 mm). UK sizes follow the same barleycorn scale but start one size lower: UK = US men − 1. US women's sizes sit 1.5 sizes above US men's for the same foot length: US women = US men + 1.5. US kids' sizes use a separate barleycorn count starting at a different anchor: US kids = 3 × (foot mm ÷ 25.4) − 10. EU sizes are based on the Paris-point system, where one point equals 2/3 cm. The shoe last — not the foot itself — is measured, so a standard 15 mm fit allowance is added before converting: EU = (foot mm + 15) × 3 ÷ 20. Japanese sizing follows the Mondopoint standard: JP = foot mm ÷ 10, expressing the foot length directly in centimetres.
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