Japanese men's clothes use S/M/L/LL. Here is roughly how they map to US/UK chest sizes, plus a dress-shirt collar chart. Japanese sizes tend to run smaller.
| JP | Chest (cm) | US / UK jacket (in) |
|---|---|---|
| S | 80–88 | 34–36 |
| M | 88–96 | 38–40 |
| L | 96–104 | 42–44 |
| LL (XL) | 100–108 | 44–46 |
Approximate — a Japanese L often fits like a US M. EU jacket size ≈ chest cm ÷ 2.
| JP / EU (cm) | US / UK (in) |
|---|---|
| 36 | 14 |
| 37 | 14.5 |
| 38 | 15 |
| 39 | 15.5 |
| 40 | 16 |
| 41 | 16.5 |
| 42 | 17 |
| 43 | 17.5 |
Dress shirts are sold by collar size — centimeters in Japan, inches in the US/UK.
Japanese men’s tops use S/M/L/LL letters tied to chest measurements. Because the average frame is smaller, a Japanese L is often closer to a US M. The equivalents below are approximate; dress shirts are sold by collar size (cm in Japan, inches in the US/UK).
These are approximate equivalents; check the garment’s chest and collar measurements against your own.
Approximate — brands vary. The Japanese figure (cm foot length, or 号) is the reliable one.
← All Japanese size converters · Japanese units converter
Generally yes. Japanese sizes are built on JIS body measurements for a smaller average frame, so a Japanese size tends to run about one size smaller than the equivalent US size. Always check the garment’s own measurements.
