Ringsizely

Sensor-fit sizing

Smart ring sizing guide

A smart ring has to fit like jewellery and like a sensor. Start from your jewellery size, then confirm with the brand kit, wear test and generation-specific notes.

Kit before order Converted jewellery size only narrows the samples to try first.
24-hour fit Sleep, swelling and hand temperature can change the best smart-ring size.
Generation checks Oura, Samsung, RingConn and Ultrahuman do not all map to the same range.
The one rule: don't auto-order from a converted jewelry size. Use the brand's sizing kit or digital sizing flow, then choose the size that stays secure without feeling tight.

Smart-ring advisor

Smart-ring sizing advisor

Compare smart ring sizing

Compare smart ring sizing
RingSizesPriceUS?
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 Historical sizes ~5–12 New orders currently paused 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.