CIRCA comes in US ring sizes 7 to 13. The quickest way to find yours is to measure the inside of a ring you already wear on the same finger.
| US ring size | Inner diameter | |
|---|---|---|
| 7 | 18.2 mm | 0.72 in |
| 8 | 18.9 mm | 0.74 in |
| 9 | 19.6 mm | 0.77 in |
| 10 | 20.4 mm | 0.80 in |
| 11 | 21.1 mm | 0.83 in |
| 12 | 21.8 mm | 0.86 in |
| 13 | 22.5 mm | 0.89 in |
Diameters are approximate, from the maker's spec of 18.2 to 22.5 mm across sizes 7 to 13.
Three tips
- Between sizes? Go up one. The ring should pass over the knuckle with slight resistance and sit snug at the base.
- Measure in the evening. Fingers are slightly larger at the end of the day, so an evening fit works all day.
- Wear it on the index finger for the most consistent readings, with the sensor side against your skin.
Wrong size? You have 30 days to exchange or return it. Get in touch with your order number.