Question 1

Is the Oura Ring 5 worth upgrading from the 4?

Accepted Answer

For most Ring 4 owners, not yet. The Ring 5 is a form-factor and signal-quality refinement — Oura’s claim is that it’s about 40% smaller (thinner and narrower), and it’s also lighter at 2–2.6 g versus the Ring 4’s 3.3–5.2 g, with a marginally longer battery — not a new-metric leap. Every new software feature rolls back to the Ring 4 with an active membership, the Ring 5 has no independent accuracy validation, its size range shrinks to 6–13, and its signal pathways drop from 18 to 12. If your Ring 4 fits and works, there is little evidence-based reason to pay again.

Question 2

What’s new in the Oura Ring 5?

Accepted Answer

The headline change is size: the Ring 5 is the world’s smallest smart ring at 2–2.6 g and 2.28 mm thick — Oura says it’s roughly 40% smaller than the Ring 4, which is 3.3–5.2 g and 2.88 mm thick. It adds an optional $99 charging case that extends total time between wall charges to about a month, a 6–9 day battery, redesigned optics (LEDs rotated 180° with a larger photodiode), and a digital temperature sensor. Sensor signal pathways drop from 18 to 12, which Oura describes as fewer but individually stronger.

Question 3

Does the Oura Ring 5 need a subscription?

Accepted Answer

Yes. Like every current Oura ring, the Ring 5 requires an Oura Membership ($5.99/month or $69.99/year) for full features. Without it, the app shows only your Sleep, Readiness, and Activity scores. Trends, detailed HRV, temperature deviations, Advisor AI, Health Radar, Blood Pressure Signals, and GLP-1 tools are all gated behind membership. That subscription is why the real 3-year cost of a Ring 5 is roughly $609 for a base finish — or about $709 for the $499 premium finishes — not $399.

Question 4

Is the Oura Ring 5 more accurate than the Ring 4?

Accepted Answer

There is no peer-reviewed evidence that it is. The Ring 4 is the only Oura ring with an independent head-to-head validation study (Dial 2025), which measured CCC 0.98 for resting heart rate and 0.99 for HRV against an ECG chest strap. The Ring 5 has zero independent studies; Oura’s own internal testing claims about 12% better HRV and 24% better workout heart rate, but those numbers are not peer-reviewed. Until independent data arrives, the validated choice for accuracy is the Ring 4.

Question 5

How much does the Oura Ring 5 cost over 3 years?

Accepted Answer

It depends on the finish. A base Ring 5 (Silver or Black, $399) runs about $609 over three years with the yearly membership: $399 for the hardware plus roughly $210 for three years of Oura Membership at $69.99/year. The four premium finishes (Gold, Stealth, Brushed Silver, Deep Rose) start at $499, which brings the three-year total to about $709. Paying membership monthly at $5.99 instead adds about $6, and the optional $99 charging case adds to either total. The Ring 4 works out to about $559 over the same period because its hardware is $50 cheaper. Subscription-free rivals like RingConn Gen 2 ($299) and Ultrahuman Ring Air ($349) avoid the membership entirely.

Question 6

What sizes does the Oura Ring 5 come in?

Accepted Answer

At launch the Ring 5 covers US ring sizes 6 to 13. That is narrower than the Ring 4, which spans sizes 4 to 15. If you have very small or very large fingers, the Ring 4 is currently the only Oura ring that fits, so check your size before choosing the Ring 5.

Question 7

Should a first-time buyer get the Ring 4 or Ring 5?

Accepted Answer

For most first-time buyers, the Ring 4 is the better pick: it is cheaper over three years, independently validated for heart rate and HRV, and fits the widest range of fingers. Choose the Ring 5 if all-day comfort and a nearly invisible ring matter more to you than proven accuracy — it is noticeably lighter and thinner — and you are comfortable buying hardware that has not yet been independently tested.

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