Oura Ring 4 sizing guide

Oura uses whole-number sizes that are close to US labels, but the final fit is brand-specific. Do not order from a jewelry size alone — use the Oura Ring 4 sizing kit and wear the sample for at least 24 hours, including sleep.

Sizing system: Proprietary whole numbers (US-style, no half sizes)
Size range: Sizes 4–15
Sizing kit: Use the Oura Ring 4 sizing kit; Size Later includes a complimentary kit, and many retailers sell kits with purchase credit.
Price: Check Oura

Smart-ring advisor

Check smart-ring fit

My usual jewelry size Target smart ring Old Oura Ring 4 size, optional

Smart-ring sensors need even skin contact The ring should stay oriented with its sensors touching the finger without painful pressure or a large gap. Sensor contactNo large gap

Order-size check

Jewelry size Starting point only

Use your normal ring size only to pick the first sample to try.

Brand kit Primary fit check

Follow the brand kit because sensors need steady skin contact.

Wear test Do before ordering

Wear the sample long enough to catch swelling, sleep, and hand-temperature changes.

Does my normal ring size fit?

Use the ring size converter to find your standard size first — it's a useful starting point — but always confirm the Oura Ring 4 fit with the brand's sizing kit or sizing flow.

Frequently asked questions

Is my Oura ring size the same as my normal ring size?

Treat your normal ring size as a starting point only. Oura says its sizes differ slightly from standard ring sizes and recommends the generation-specific sizing kit before ordering.

What sizes does the Oura Ring 4 come in?

Oura Ring 4 is listed in whole sizes 4 through 15, with no half sizes.

Compare all devices on the smart ring sizing guide.