# Shoe Size Converter — US, UK, EU & JP Sizes > Convert shoe sizes instantly between US (men/women/kids), UK, EU and Japanese sizing. Enter your foot length or a known size to see all systems at once. - **Category:** Conversions & Units - **Interactive calculator:** https://youcalc.com/en/conversions-units/shoe-size-converter/ - **Price:** Free, no sign-up required ## Overview 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 result 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. ## Method 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. ## Example - **Setup:** 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. - **Result:** 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. ## Related calculators - [Ring Size Converter](https://youcalc.com/en/conversions-units/ring-size-converter/) - [Unit Converter](https://youcalc.com/en/conversions-units/unit-converter/) ## Sources - https://www.iso.org/standard/71594.html - https://en.wikipedia.org/wiki/Shoe_size --- Interactive version: https://youcalc.com/en/conversions-units/shoe-size-converter/ · From YouCalc — https://youcalc.com