JP to US numeric jeans size
The short answer
By the formula, JP 13 is US numeric 10.
No brand chart we have checked prints both systems, so this table is the arithmetic alone. Treat it as the label convention, not a fit.
| JP | US numeric |
|---|---|
| 3 | 0 |
| 5 | 2 |
| 7 | 4 |
| 9 | 6 |
| 11 | 8 |
| 13 | 10 |
| 15 | 12 |
| 17 | 14 |
| 19 | 16 |
| 21 | 18 |
| 23 | 20 |