Convert Millimeters of Circumference to US Ring Sizes
1 inner circumference (mm) = -13.916977 us ring sizes. Multiply by 0.39161935, then − 14.308596.
1 mm = -13.9169767 US
Multiply by 0.39161935, then − 14.308596.
Fingers change size with temperature and time of day, and wide bands fit tighter. Have a jeweller confirm before buying. About accuracy
Millimeters of Circumference to US Ring Sizes table
| Millimeters of Circumference | US Ring Sizes |
|---|---|
| 1 mm | -13.916977 US |
| 2 mm | -13.525357 US |
| 3 mm | -13.133738 US |
| 4 mm | -12.742119 US |
| 5 mm | -12.350499 US |
| 10 mm | -10.392403 US |
| 20 mm | -6.4762091 US |
| 25 mm | -4.5181124 US |
| 50 mm | 5.2723713 US |
| 100 mm | 24.853339 US |
| 500 mm | 181.50108 US |
| 1000 mm | 377.31075 US |
About these units
The inner circumference (mm) (mm) is a metric 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 = 39.0905 millimeters of circumference. 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 inner circumference (mm)?
- 1 inner circumference (mm) = -13.916977 us ring sizes.
- How do you convert millimeters of circumference to us ring sizes?
- Multiply by 0.39161935, then − 14.308596.
- What is 10 mm in US?
- 10 mm = -10.392403 US.