Smart ring sizing updates

A dated record of the official-source checks behind our smart-ring sizing guides. A brand kit or sizing flow remains the final order check.

Latest source review

This review records the currently published ranges, sizing guidance and availability notes. It does not turn a jewelry-size conversion into an order guarantee.

Circular Ring 2

last verified 2026-10-20 · next review2026-11-20

Size range: Sizes 6–14
Sizing kit: Circular offers a phone-camera web tool and a physical kit listed at $5. Its guide recommends the kit as the most reliable option, especially between sizes. Confirm fit with the kit before ordering.
Price: Check Circular

Verify app-camera sizing and physical-kit price before using in buyer CTAs.

Official sources: Circular sizing guide (opens in a new tab), Circular sizing kit (opens in a new tab)

Oura Ring 4

last verified 2026-10-20 · next review2026-11-20

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

Review with every Oura generation launch or kit-policy change.

Official sources: Oura Ring 4 support (opens in a new tab), Oura sizing guide (opens in a new tab)

Oura Ring 5

last verified 2026-10-20 · next review2026-11-20

Size range: Sizes 6–13
Sizing kit: Use the Oura Ring 5 sizing kit; do not rely on Ring 4 kit results as a final order size.
Price: Check Oura

Ring 5 has generation-specific fit/range notes; do not reuse Ring 4 source assumptions.

Official sources: Oura Ring 5 support (opens in a new tab), Oura sizing guide (opens in a new tab)

RingConn Gen 2

last verified 2026-10-20 · next review2026-11-20

Size range: Sizes 6–14
Sizing kit: Free sizing kit, a 3D-print template, or borrow-and-measure.
Price: ~$299

Recheck published mm chart and kit guidance before affiliate activation.

Official sources: RingConn sizing guide (opens in a new tab)

Samsung Galaxy Ring

last verified 2026-10-20 · next review2026-11-20

Size range: Sizes 5–15
Sizing kit: Use the Galaxy Ring sizing kit before ordering; Samsung recommends wearing a sample for more than 24 hours.
Price: Check Samsung

Recheck when Samsung changes kit contents, ring size range or sensor-fit guidance.

Official sources: Samsung Galaxy Ring sizing support (opens in a new tab), Samsung Galaxy Ring product page (opens in a new tab)

RingConn Gen 3

last verified 2026-09-30 · next review2026-12-30

Size range: Sizes 6–15
Sizing kit: Choose the Gen 3 sizing kit. Test the sample for 24 hours, including sleep and daily activities, before submitting your size.
Price: Check RingConn

Official sources: Gen 3 sizing guide (opens in a new tab), Gen 3 sizing kit (opens in a new tab), Gen 3 sizes (opens in a new tab)

Ultrahuman Ring AIR

last verified 2026-09-23 · next review2026-10-23

Size range: Sizes 5–14
Sizing kit: Free plastic sizing kit on order.
Price: ~$349

2026-09-23: official global store lists $349, sizes 5–14 and a free kit; the USITC corrected order still names Ultrahuman. Recheck US availability before every monetized update.

Official sources: Ultrahuman Ring AIR (opens in a new tab), USITC exclusion order (opens in a new tab)

Evie Ring

last verified 2026-08-20 · next review2026-09-03

Size range: Historical sizes ~5–12
Sizing kit: New orders and shipments are currently paused, so an active sizing-kit flow is not confirmed.
Price: Availability unverified

2026-09-05: direct official source retrieval failed; indexed search text still contains the April 10 pause notice. Historical verification date retained. Current stock, kit and price are not verified; page excluded from indexing.

Official sources: Evie Ring store (opens in a new tab), Evie order-pause update (opens in a new tab)

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