Smart ring sizes may differ from conventional jewelry sizes. Oura recommends trying its model-specific plastic sizing ring before selecting a size, wearing the sizer for at least 24 hours and checking that the fit is snug but comfortable.
Use the maker’s own sizer rather than assuming that a conventional jewelry size will match. Oura says its ring sizes differ slightly from standard sizes, recommends a sizing kit, and advises wearing the sizing ring for at least 24 hours before choosing.
Smart ring fit checklist
- Identify the exact smart ring model and generation.
- Read whether the maker uses its own size scale or standard ring sizes.
- Use that model’s sizing kit or sizing instructions.
- Wear the sizer for the period the maker recommends.
- Check the fit through normal hand movement and follow the maker’s instructions if you are between sizes.
- Confirm model-specific orientation and fit directions after receiving the device.
Oura’s instructions are specific to Oura rings. Other smart rings may use different sizes, sizers and fit guidance.
Compare smart rings and smartwatches, use the fitness band and smartwatch feature checklist, and browse smart rings.
For questions about a device or its readings, speak with your doctor.
Source
For glucose measurement claims, read what the FDA says about smart rings.
Common questions
Can I use my regular ring size for a smart ring?
Check the device maker's sizing system. Oura says its sizes differ slightly from standard ring sizes and that half sizes are not available.
How long should I wear the sizing ring?
Oura recommends wearing its sizer for at least 24 hours, including while sleeping.
How should a smart ring fit?
Oura says its ring should feel snug but comfortable, without gaps when you make a fist.
Do all smart rings use Oura's sizing rules?
No. Use the sizing guide and sizer for the exact smart ring model.