Oura Ring 5

What changed from Ring 4

Oura announced Ring 5 on 28 May 2026 and calls it the world’s smallest smart ring. Next to Ring 4, most of the change is in the shell: 6.09mm wide and 2.28mm thick instead of 7.9mm and about 2.88mm, with 40% less volume. The sensor dome on the inside stands 0.7mm high.

Spec	Oura Ring 5	Oura Ring 4
Sizes	6–13	4–15
Width and thickness	6.09 × 2.28 mm	7.9 × about 2.88 mm
Battery	Typically 6–9 days	Typically 5–8 days
Data stored on the ring	Up to 3 days	Up to 7 days
App and membership	Same	Same
US price, 19 September 2026	From $399	From $349

The app didn’t change. With an active membership, Ring 5 has the same features as Ring 4. Oura’s Ring 5 announcement also covered Health Radar, Counsel Health guidance and GLP-1 Insights, but those roll out to Gen3 and newer rings as well. You’d upgrade for the smaller ring and the longer battery, not for new scores. Oura Ring 4 vs Oura Ring 5 goes through the rest.

Get sized with the Ring 5 kit

Oura makes a sizing kit for each generation, and the Ring 5 kit has white sizers from 6 to 13. Use it even if you already wear a Ring 4: Oura says Ring 5 sizing is slightly different and tells you not to size with a Ring 4 kit.

Battery, charging and the case

Oura rates Ring 5 at typically 6–9 days per charge and says that varies with ring size, settings, activity and battery age. A full charge takes about 80 minutes on the dock, which is made for your ring size.

The Ring 5 Charging Case is new and costs extra. Oura says it carries up to a month of battery and gives the ring a full day in about 10 minutes, which is useful if you travel and would rather not pack the dock.

What the membership pays for

Ring 5 is a subscription ring. Oura Membership costs $5.99 a month or $69.99 a year in the US, and new members get the first month free. It pays for detailed sleep analysis, 24/7 heart rate, Stress, Heart Health, Metabolic Health, Women’s Health and blood oxygen tracking. If you stop paying, you can still export your own data as a CSV file.

Sensors and Oura’s accuracy claims

Inside are two sets of triple LEDs (red, green and infrared), two photodetectors, a digital temperature sensor and an accelerometer; Oura counts 12 signal pathways between them. Ring 5 tracks heart rate around the clock, recognizes 40+ activities on its own and sets activity goals that adjust to you.

Oura puts heart-rate accuracy at 99% and sleep staging at 95%, citing its own validation work and a 2021 paper in the journal Sensors. Those are Oura’s numbers, not independent tests. Oura is also clear that the ring isn’t a medical device: it isn’t meant to diagnose, treat, cure, monitor or prevent any condition.

Water and temperature

Oura rates Ring 5 to 100 meters (IP68), and showers, swimming, saunas and water sports are all fine. The limit is time: Oura’s general FAQ says not to leave the ring underwater for more than 12 hours.

Oura gives two slightly different temperature ranges: −10 to 54 °C (14 to 129 °F) on the Ring 5 page, and −10 to 52 °C (14 to 125 °F) in the general FAQ and its safety guide. Charge it at room temperature.

Price

On 19 September 2026, Oura’s US store listed Ring 5 from $399 in Silver and Black and $499 in Gold, Deep Rose, Stealth and Brushed Silver. In euros, the same store showed it from €429. Budget for the membership on top: $69.99 a year, or $5.99 a month, after the free first month. Ring 4 was still on sale from $349 that day. Prices move, so check before you buy.