Oura Ring 5 is official – and it’s the world’s smallest smart ring

Oura has announced the Ring 5 and it’s not only the Finnish company’s smallest smart ring, but it’s the smallest smart ring. Period. If you’ve ever done any research into smart rings, or considered putting one on your finger, you’ll no doubt have heard of Oura.

It’s the OG when it comes to smart rings and while the Ring 5 arrives into a significantly more crowded market, it’s not a huge surprise Oura has been the first to make a smart ring that looks more like a piece of jewellery than a piece of tech. The difference between the first generation and this fifth generation is huge, but there are significant differences compared to the Ring 4, too.

What’s new about the Oura Ring 5 and how is it different to Ring 4?

The Oura Ring 5 is claimed to be 40 per cent smaller than the Ring 4 (which I have on my finger as I type this news up). This, in turn, has allowed Oura to claim the “world’s smallest smart ring” accolade.

It measures just 6.09mm wide (compared to 7.9mm on the Ring 4) and it’s only 2.28mm thick (compared to 2.88mm on the 4). In terms of weight, it’s around 2g depending on the size you choose, while the Ring 4 was between 3.9g and 5g, and the Ring 5 is made from more scratch-resistant titanium too (let’s hope that’s definitely the case, as time was not kind to my Ring 4).

Inside, Oura has completely rebuilt the sensing architecture for the Ring 5. There are now twelve stronger signal pathways, new low-profile sensor domes for better skin contact, and more powerful LEDs – all of which Oura says deliver greater accuracy across more finger types and skin tones.

Speaking of fingers (we’re talking about a smart ring here after all), the finger is claimed to be a better place than the wrist to measure health signals. According to Oura, the arteries in your finger produce a pulse signal up to 100 times stronger than at the wrist, which is why it has always argued the ring form factor beats a smartwatch, like Apple Watch, for health tracking. That said, a smartwatch does have its own advantages, not least of which is that you can see metrics live as you’re working out.

In a bid to somewhat combat that, Oura has added some new features on the software side, including live activity tracking for the first time. This means you can finally follow pace, distance, and heart rate in real time from your phone during a workout.

There are some interesting additions to women’s health, too. A new Menopause Insights dashboard is now available, featuring the Menopause Impact Scale, which is based on a proprietary clinical questionnaire. I’ve seen this in the app for my Ring 4, and so far, it’s ‘Looking Good’ for me.

There’s also a Hormonal Birth Control feature that will adapt cycle tracking for those on the pill, patches, IUDs or implants, and a Lab Uploads tool will let you import blood work results directly into the Oura app so you can see them alongside your biometric data. You’ll also be able to delete time-specific windows of your data should you wish to with the Data Deletion capability.

A couple of things to note

If you’re a current Oura member hoping to hand your Ring 4 back in, don’t hold your breath – there’s no trade-in programme here, which is a real shame. Instead, you’re buying Ring 5 on top of whatever you already have, though Oura does now support multiple rings on one account, so at least your old ring won’t be completely redundant.

There’s also support for multiple devices in the Locate feature, so you can track your Oura Ring in the app with an in-app search mode, too. No integration with Apple Find My or Google’s Find Hub, however, which feels somewhat like a missed opportunity.

The new Charging Case – a portable aluminium case that stores a month’s worth of battery and supports wireless charging (unlike the Ring 4 Charging Case) – is also Ring 5 specific. It won’t work for older generations, so be sure to factor in that extra £99 expense when making your decision.

Oura also recommends everyone order a new sizing kit before buying, even if you already know your Oura size. At 40 per cent smaller, the fit may feel different at the same size number, though I have to say, I tried it on and was still very much a size 9.

Price and availability

The Oura Ring 5 is available to pre-order in the UK now, with shipping starting on 4 June 2026. Pricing starts at £399 for Silver and Black (up £50 compared to the Ring 4 launch price), and £499 for the premium finishes – Gold, Stealth, Brushed Silver, and the two new additions, a refreshed lighter Gold and a new Deep Rose copper-rose finish. Sizes run from 6 to 13.

If you want to see it in person before buying, Oura is opening a dedicated space inside Harrods on 29 May. You can also pick it up through John Lewis, Selfridges, Boots, Currys, Argos, Amazon UK, EE and a handful of other retailers.

Oura membership, required to use the full feature set (it’s pretty pointless without it), remains £5.99 a month or £69.99 a year.