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Sources & Methodology
US Men’s ↔ UK Men’s: UK = US − 0.5 (e.g. US 10 = UK 9.5) US Men’s ↔ EU: EU ≈ US + 33.5 (e.g. US 10 = EU 43–44) US Women’s ↔ EU: EU ≈ US + 31 (e.g. US 8 = EU 39) Foot Length (cm) ↔ US Men’s: US ≈ (foot_cm × 3.94 − 22.5) / 0.5 rounded to nearest 0.5 US Men’s ↔ Women’s: Women’s = Men’s + 1.5 (standard US conversion) Japan sizes are in cm (foot length). Korea sizes are in mm. AU men’s equals US men’s. AU women’s equals UK women’s.
Last reviewed: April 2026
Shoe Size Conversion Guide — All Systems Explained
Shopping for shoes online from international retailers, buying from brands in different countries, or gifting shoes to someone abroad all require accurate shoe size conversion. The problem is there is no single global shoe sizing standard — the US, UK, Europe, Asia, and Australia all use different scales that evolved independently. This guide explains every major system and how to convert between them accurately.
Men’s Shoe Size Conversion Table
| US Men’s | UK | EU | AU | Japan (cm) | Korea (mm) | Foot cm |
|---|---|---|---|---|---|---|
| 6 | 5.5 | 39 | 6 | 24 | 240 | 23.5 |
| 6.5 | 6 | 39.5 | 6.5 | 24.5 | 245 | 24.0 |
| 7 | 6.5 | 40 | 7 | 25 | 250 | 24.5 |
| 7.5 | 7 | 40.5 | 7.5 | 25.5 | 255 | 25.0 |
| 8 | 7.5 | 41 | 8 | 26 | 260 | 25.5 |
| 8.5 | 8 | 42 | 8.5 | 26.5 | 265 | 26.0 |
| 9 | 8.5 | 42.5 | 9 | 27 | 270 | 26.5 |
| 9.5 | 9 | 43 | 9.5 | 27.5 | 275 | 27.0 |
| 10 | 9.5 | 44 | 10 | 28 | 280 | 27.5 |
| 10.5 | 10 | 44.5 | 10.5 | 28.5 | 285 | 28.0 |
| 11 | 10.5 | 45 | 11 | 29 | 290 | 28.5 |
| 12 | 11.5 | 46 | 12 | 30 | 300 | 29.5 |
Women’s Shoe Size Conversion Table
| US Women’s | UK | EU | AU | Japan (cm) | Korea (mm) | Foot cm |
|---|---|---|---|---|---|---|
| 5 | 3 | 35.5 | 3 | 22 | 220 | 21.5 |
| 5.5 | 3.5 | 36 | 3.5 | 22.5 | 225 | 22.0 |
| 6 | 4 | 36.5 | 4 | 23 | 230 | 22.5 |
| 6.5 | 4.5 | 37 | 4.5 | 23.5 | 235 | 23.0 |
| 7 | 5 | 37.5 | 5 | 24 | 240 | 23.5 |
| 7.5 | 5.5 | 38 | 5.5 | 24.5 | 245 | 24.0 |
| 8 | 6 | 38.5 | 6 | 25 | 250 | 24.5 |
| 8.5 | 6.5 | 39 | 6.5 | 25.5 | 255 | 25.0 |
| 9 | 7 | 39.5 | 7 | 26 | 260 | 25.5 |
| 9.5 | 7.5 | 40 | 7.5 | 26.5 | 265 | 26.0 |
| 10 | 8 | 41 | 8 | 27 | 270 | 26.5 |
| 11 | 9 | 42 | 9 | 28 | 280 | 27.5 |
Kids’ Shoe Size Chart — US, UK and EU
| US Kids | UK Kids | EU | Foot Length (cm) | Age Guide |
|---|---|---|---|---|
| 4 (Toddler) | 3.5 | 19-20 | 11.5 | 12–18 months |
| 6 (Toddler) | 5.5 | 22-23 | 13.5 | 18–24 months |
| 8 (Little Kid) | 7 | 25 | 15.0 | 2–3 years |
| 10 (Little Kid) | 9 | 27 | 16.5 | 3–4 years |
| 12 (Little Kid) | 11 | 30 | 18.5 | 5–6 years |
| 13 (Little Kid) | 12 | 31 | 19.5 | 6–7 years |
| 1 (Youth) | 13 | 32-33 | 20.0 | 7–8 years |
| 3 (Youth) | 2 | 35 | 21.5 | 8–9 years |
| 5 (Youth) | 4 | 37 | 23.0 | 10–12 years |
| 7 (Youth) | 6 | 39-40 | 24.5 | 12–14 years |
How to Measure Your Foot for Shoe Size
Getting an accurate foot measurement is the most reliable way to find your shoe size in any country’s system. Shoe sizing guides from the American Orthopaedic Foot and Ankle Society recommend measuring in the afternoon when feet are at their largest due to daily swelling. Here is how to measure correctly:
- Step 1: Place a piece of paper on a hard floor against a wall. Stand on the paper with your heel touching the wall.
- Step 2: Trace around your foot with a pencil held vertically (not angled). Include both feet — measure the larger one.
- Step 3: Measure from the back of the heel mark to the tip of the longest toe in centimetres.
- Step 4: Add 0.5–1.0 cm to your measured foot length for the recommended shoe interior length.
- Step 5: Enter your foot length in cm in the Foot Length tab above to find your size in all 7 systems.
Understanding Shoe Width — A Gap Most Converters Miss
Most online shoe size converters only cover length. Width is equally important for comfort and foot health. US shoe widths from narrowest to widest:
AA (2A) = Extra Narrow • A = Narrow • B = Standard (women’s default) • D = Standard (men’s default) • E = Wide • EE (2E) = Extra Wide • EEE / 4E = Extra Extra Wide
If you have wide feet, look for “W” or “Wide” labeling. UK width fittings: C = narrow, D = standard, E = wide, EE = extra wide, EEE/EEEE = extra extra wide. Most EU shoes only come in one standard width.
Men’s vs Women’s Shoe Sizes — How Conversion Works
In the US sizing system, women’s shoes are approximately 1.5 sizes larger than men’s shoes of the same physical length. This means a man’s size 9 is roughly equivalent in length to a woman’s size 10.5. However, the actual internal volume and last (the mould) differ between men’s and women’s shoes — women’s shoes are typically narrower. When a woman wears a men’s shoe, she should also consider the width difference. In EU and UK sizing, the numbers represent the same foot length regardless of gender, though the last shapes differ.
Why Shoe Sizes Differ Between Countries
Three different sizing systems evolved independently across the world. UK sizing (barleycorn system) dates to medieval Britain: each size represents one-third of an inch (8.47mm). US sizing follows a similar barleycorn basis but starts at a different zero point and differs by gender. EU sizing (Paris point system) originated in France: each size equals two-thirds of a centimetre (6.67mm) of shoe last length. Japanese and Korean sizing use actual foot length in centimetres or millimetres — the most intuitive system. Because these systems evolved separately, no perfectly clean formula converts between them; the values in this calculator are the industry-standard averages used by major retailers globally.