Shoe Size Converter
Korea mm to US, EU, Japan, UK — and back. Type any field; the rest update automatically.
📋 Full conversion table
| 🇰🇷 mm | 🇺🇸 US | 🇪🇺 EU | 🇯🇵 JP | 🇬🇧 UK |
|---|
- Measure foot length: In the evening, on A4 paper, mark the tip of your longest toe and measure in mm. Use the larger foot + 0.5–1 cm of room.
- Brand differences: Nike, Adidas, New Balance can differ ±0.5 at the same listed size — also check the brand\'s official size chart.
- Use reviews: Check product reviews for "runs small/large" and adjust ±1.
- Width (W/M/N): US sizing includes width (Narrow/Medium/Wide). Most Koreans fit Medium.
How to Use
Choose men, women, or kids. Within the same country sizing differs by gender, so this is required for accurate conversion.
Enter your size in Korea (mm), US, EU, Japan (JP), or UK. The other four fields update instantly using standard mapping.
The tables are standard conversions. Brand-specific differences of ±0.5 are common — also check the brand's official size guide whenever possible.
FAQ
What unit is the Korean shoe size?
Korea and Japan use mm (265 = 26.5 cm). US uses integer + 0.5 (8, 8.5, 9 …), EU uses integers (41, 42, 43 …), UK is about 0.5–1 smaller than US. This tool maps at 5 mm (0.5 cm) intervals.
Why do men/women/kids sizes differ?
US and UK use separate scales by gender — the same 245 mm is men's US 7 but women's US 8 — and kids use a different system (US 1Y, 2Y …). Pick gender first for an accurate conversion.
Why do brands fit differently at the same size?
Brands like Nike, Adidas, and New Balance use different "last" shapes and widths (narrow/medium/wide). This is a standard mapping — check the brand's official size chart for the exact fit.
Tips for buying shoes on Amazon or AliExpress?
(1) Measure foot length in cm/mm → (2) convert using this tool → (3) check the product's "Size Chart" → (4) read reviews for "runs small/large" and adjust ±1. With expensive international returns, all 4 steps matter.
How to measure foot length?
In the evening (when feet are most swollen), place heel against a wall on A4 paper, mark the tip of your longest toe, and measure. Measure both feet — use the larger one + 0.5–1 cm of room. The mm value is exactly your Korean size.
Is my input sent to a server?
No — the conversion tables are embedded in the page, no network calls at all.
