The Oura Ring 5 came out on May 28, 2026, about a year and a half after the Oura Ring 4. It’s the same idea in a much smaller package: a thinner, narrower, lighter titanium ring with a redesigned sensor array and a day or so more battery. The app, the membership, and nearly all the software features are the same on both.
The short answer: buy the Oura Ring 5 ($399) if you’re buying your first Oura, you want a ring that looks and feels like ordinary jewelry, or you have small fingers. Buy the Oura Ring 4 (about $349 on Amazon) if you want to save $50, you need a size 4, 5, 14, or 15, which Ring 5 doesn’t come in, or you don’t mind a chunkier ring. If you already own a Ring 4, there’s little reason to upgrade.
Oura Ring 5 vs. Oura Ring 4
| Spec | Oura Ring 5 | Oura Ring 4 |
|---|---|---|
| Released | May 2026 | October 2024 |
| Price | $399; $499 premium finishes | About $349 on Amazon |
| Width / thickness | 6.09 mm / 2.28 mm | 7.90 mm / 2.88 mm |
| Weight | From 2 g | 3.3 to 5.2 g |
| Sizes | 6 to 13 | 4 to 15 |
| Sensors | 12 signal pathways, stronger LEDs, low sensor domes | 18 signal pathways, flat interior |
| Battery | 6 to 9 days | 5 to 8 days |
| Charging | Dock included; $99 case charges wirelessly | Dock included |
| Membership | $5.99/month or $69.99/year | $5.99/month or $69.99/year |
| Waterproof | 100 m | 100 m |
Best for most people
Oura Ring 5
Oura's smallest, lightest ring, with 6 to 9 days of battery and waterproofing to 100 meters.
Best value, and for sizes 4, 5, 14, and 15
Oura Ring 4
The previous Oura, with the same app and features, 5 to 8 days of battery, and a wider range of sizes.
Size and Comfort
This is the main upgrade. The Ring 5 is 6.09 mm wide and 2.28 mm thick, against 7.90 mm and 2.88 mm for the Ring 4, and it weighs from 2 grams instead of 3.3 to 5.2. Oura calls it 40% smaller and the world’s smallest smart ring. At about 6 mm wide, it’s in the range of a slim wedding band, while the Ring 4 is noticeably wider and thicker.
A smaller ring matters most at night and in the gym. It’s less likely to bump a pillow or press against the next finger while you sleep, and it gets in the way less when you grip a bar or a kettlebell. If you’ve tried an Oura before and found it too bulky, the Ring 5 is the one to try.
Both are titanium inside and out and waterproof to 100 meters. The Ring 5 adds a tougher scratch-resistant coating, which helps, because shiny titanium rings scratch easily.
Sizing
Ring 5 comes in sizes 6 to 13. Ring 4 comes in 4 to 15. If your size is at either end of that range, the Ring 4 is your only Oura.
The Ring 5’s interior is shaped differently, and Oura says it fits differently than the Ring 4, so your Ring 4 size may not carry over. Order Oura’s free sizing kit for the Ring 5 even if you already know your Ring 4 size, and wear the sample ring for a day or two, including overnight. Smart ring sizes don’t match jewelry sizes reliably either.
Sensors and Accuracy
Both measure the same things: heart rate, heart rate variability (HRV), breathing rate, blood oxygen at night, skin temperature trends, and movement. The hardware behind it is different.
- Ring 4 reads your finger along 18 signal pathways through sensors recessed into a perfectly flat, round interior.
- Ring 5 uses 12 signal pathways, but with LEDs about four times as powerful and small, low-profile sensor bumps that sit closer to the skin.
Fewer pathways sounds like a downgrade. Oura’s argument is that stronger light and better skin contact matter more than the number of paths. Oura cites 99% heart rate accuracy against an ECG and 95% sleep-staging agreement with a sleep lab, but those figures describe its platform and validation studies in general, not the Ring 5 specifically. Independent tests of the Ring 5’s sensors aren’t out yet. Either ring is among the most accurate sleep trackers you can wear.
Battery and Charging
The Ring 5 is rated for 6 to 9 days per charge, the Ring 4 for 5 to 8 days, both depending on ring size and settings. Smaller rings have smaller batteries, so expect the low end if you wear a small size. The Ring 5 charges fully in about 80 minutes on its dock.
The optional Ring 5 charging case ($99) holds about five full charges and can itself be charged wirelessly. Ten minutes in the case gives about a day of use. Ring 4 chargers and cases don’t fit the Ring 5, so if you upgrade, your old accessories won’t carry over.
Features and the App
Almost everything in the app works on both rings, because Oura’s features live in the Oura Membership ($5.99 a month or $69.99 a year), not the hardware. Both rings get:
- Sleep, Readiness, and Activity scores, stress and resilience, and automatic workout detection
- Cycle, pregnancy, and menopause insights
- Cardiovascular age and cardio capacity
- Health Radar, including blood pressure signals, which flag possible signs of elevated blood pressure but don’t give readings, and nighttime breathing signals that track breathing disturbances over 30 days. At launch, Health Radar is English-only and available in the US, India, and the UAE.
- Oura Advisor, the app’s AI health assistant
What the Ring 5 adds is hardware: the smaller body, longer battery, and a sensor layout Oura says detects activity more accurately. Without a membership, either ring shows only basic data, so budget for it.
Price and Three-Year Cost
The Ring 5 costs $399 in silver or black and $499 in gold, deep rose, stealth, or brushed silver. The Ring 4 launched at $349 and now sells for about $349 on Amazon in silver and stealth. Oura’s own store now leads with the Ring 5.
Over three years with an annual membership:
| Ring | 3 years of membership | Total | |
|---|---|---|---|
| Oura Ring 5 | $399 | $210 | $609 |
| Oura Ring 4 | $349 | $210 | $559 |
If you want a smart ring without a membership, look at RingConn, which charges nothing after you buy the ring. Our RingConn vs. Oura comparison covers the trade-offs.
Should You Upgrade From the Ring 4?
Probably not. Your Ring 4 gets the same new software features, the same scores, and the same membership. You’d pay $399 or more, plus another $99 if you want the new charging case, for a smaller ring and roughly one more day of battery.
Upgrade only if the Ring 4’s size bothers you, at night or when you lift, or if its battery has worn down noticeably. Ring 3 owners have a stronger case: the Ring 5 is far smaller, and the Ring 3 is two generations old.
Which Should You Buy?
Buy the Oura Ring 5 if:
- You’re buying your first smart ring, or giving one as a gift (include the sizing kit step)
- You want the smallest, lightest, most jewelry-like ring
- You found earlier Oura rings bulky to sleep or lift in
- Your size is between 6 and 13
Buy the Oura Ring 4 if:
- You want to save about $50, or find it on sale for less
- You wear a size 4, 5, 14, or 15
- You don’t mind a wider, heavier ring
Not sure a ring is right for you at all? See how Oura compares with a wrist band in Oura vs. Whoop.
Oura Ring 5 vs. 4 FAQ
Is the Oura Ring 5 worth it over the Ring 4?
For a new buyer, yes, if the $50 difference doesn’t matter: it’s much smaller and lighter and lasts a bit longer. For a Ring 4 owner, usually not, because both rings get the same app features.
Is the Oura Ring 5 the same size as the Ring 4?
No. Ring 5 sizes run from 6 to 13 and fit differently from Ring 4 sizes, which run from 4 to 15. Use the Ring 5 sizing kit rather than your Ring 4 size.
Does the Oura Ring 4 get the new Ring 5 features?
Nearly all of them. Health Radar, blood pressure signals, nighttime breathing, and Oura Advisor come with the membership on Ring 4 too. The Ring 5’s advantages are its size, battery, and sensors.
How long does the Oura Ring 5 battery last?
Oura rates it at 6 to 9 days per charge, depending on ring size and settings, compared with 5 to 8 days for the Ring 4.
Do you need a subscription for the Oura Ring 5?
Effectively, yes. The Oura Membership costs $5.99 a month or $69.99 a year, and the scores and insights depend on it. New members get the first month free.
Can I use my Ring 4 charger with the Ring 5?
No. The Ring 5 comes with its own size-specific charger, and Ring 4 chargers and cases don’t fit it.
