Convert French Ring Sizes to US Ring Sizes
1 france / spain size = 1.7477971 us ring sizes. Multiply by 0.39161935, then + 1.3561778.
1 FR = 1.747797141 US
Multiply by 0.39161935, then + 1.3561778.
Fingers change size with temperature and time of day, and wide bands fit tighter. Have a jeweller confirm before buying. About accuracy
French Ring Sizes to US Ring Sizes table
| French Ring Sizes | US Ring Sizes |
|---|---|
| 1 FR | 1.7477971 US |
| 2 FR | 2.1394165 US |
| 3 FR | 2.5310358 US |
| 4 FR | 2.9226552 US |
| 5 FR | 3.3142745 US |
| 10 FR | 5.2723713 US |
| 20 FR | 9.1885647 US |
| 25 FR | 11.146661 US |
| 50 FR | 20.937145 US |
| 100 FR | 40.518112 US |
| 500 FR | 197.16585 US |
| 1000 FR | 392.97552 US |
About these units
The france / spain size (FR) is a specialist or regional unit of ring size.
The us / canada size (US) is a US customary unit of ring size.
Going the other way, 1 us / canada size = -0.9095 french ring sizes. Ring sizes are all derived from the inner circumference of the band. The US scale adds about 2.55 mm of circumference per size, the ISO standard quotes the circumference in millimetres directly, and France and Spain quote the circumference minus 40. Measure a ring that already fits rather than your finger, at room temperature.
Frequently asked
- How many us ring sizes are in a france / spain size?
- 1 france / spain size = 1.7477971 us ring sizes.
- How do you convert french ring sizes to us ring sizes?
- Multiply by 0.39161935, then + 1.3561778.
- What is 10 FR in US?
- 10 FR = 5.2723713 US.