Japanese sizes to US sizes
Type a value in JP to get it in US instantly.
4.098US
That's 1.07× as big as a child’s ring, while an average women’s ring is 1.11× bigger. That is about 14.96 mm across the inside.
What it means
How big is that ring?
Measure a ring that fits across its inside, or wrap a strip of paper around the finger. Fingers swell in heat, so measure warm.
The math
How to convert JP to US
Each scale steps differently: EU = circumference in mm, US = (circumference − 36.54) ÷ 2.55, and the diameter is the circumference divided by π.
Example: 7 JP = 4.09751 US.
Every unit
Your ring size in every system
Tables
JP to US conversion table
| JP | US |
|---|---|
| 3 JP | 2.53104 US |
| 4 JP | 2.92266 US |
| 5 JP | 3.31427 US |
| 6 JP | 3.70589 US |
| 7 JP | 4.09751 US |
| 8 JP | 4.48913 US |
| 9 JP | 4.88075 US |
| 10 JP | 5.27237 US |
| 11 JP | 5.66399 US |
| 12 JP | 6.05561 US |
| 13 JP | 6.44723 US |
US to JP conversion table
| US | JP |
|---|---|
| 3 US | 4.1975 JP |
| 4 US | 6.751 JP |
| 5 US | 9.3045 JP |
| 6 US | 11.858 JP |
| 7 US | 14.4115 JP |
| 8 US | 16.965 JP |
| 9 US | 19.5185 JP |
| 10 US | 22.072 JP |
| 11 US | 24.6255 JP |
| 12 US | 27.179 JP |
| 13 US | 29.7325 JP |
Quick answers
Quick answers
- How many US is 1 JP?
- 1 JP is 1.7478 US.
- How many US is 10 JP?
- 10 JP is 5.27237 US.
- How many US is 7 JP?
- 7 JP is 4.09751 US.
The units
About these units
Japanese sizes (JP)
Japanese sizes: size 1 is 41 mm round, and each size adds 1 mm.
US sizes (US)
American numeric sizes, stepping 2.55 mm of circumference each whole size.
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