Smart ring sizing guide
Your jewelry size is only a starting point for a smart ring. Each brand has its own sizing process, sensor fit and size range — here is what to check before you order.
Smart-ring advisor
Smart-ring sizing advisor
Compare smart ring sizing
| Ring | Sizes | Price | US? |
|---|---|---|---|
| Oura Ring 4 | Sizes 4–15 | Check Oura | yes |
| Oura Ring 5 | Sizes 6–13 | Check Oura | yes |
| Samsung Galaxy Ring | Sizes 5–15 | $399.99 | yes |
| RingConn Gen 2 | Sizes 6–14 | ~$299 | yes |
| Ultrahuman Ring AIR | Sizes 5–14 | ~$349 | check status |
| Circular Ring 2 | Sizes 6–14 | ~$379 and up | yes |
| Evie Ring | Sizes ~5–12 | ~$269 | yes |
Frequently asked questions
Is my smart ring size the same as my normal ring size?
Not reliably. Smart rings may use familiar labels, but the final fit is brand-specific because sensors need steady skin contact. Use the brand’s sizing process and wear any sample sizer for the recommended trial period before ordering.
Why do smart rings need a sizing kit?
A sizing kit or digital sizing flow lets you test comfort, swelling, sleep fit and sensor placement before choosing a final order size. Your jewelry size is useful for narrowing the first sizes to test, not for skipping the brand check.
Which smart rings can I buy in the US?
Oura, Samsung Galaxy Ring and RingConn are available in the US. Ultrahuman Ring AIR availability is legally volatile after the 2025 USITC exclusion order, so check Ultrahuman’s current US product lineup before buying.
For jewelry rings, use the ring size converter or the chart.