Can a smart ring measure blood pressure or glucose?

Blood pressure: what rings actually do

A ring doesn't squeeze your finger the way a cuff squeezes your arm. It reads your pulse with light, and the blood pressure features built on it are estimates of how your pressure is trending. Circular describes its version in one line that could stand for the whole category: “A trend read from the pulse wave, calibrated against your own cuff” ( Circular).

Three things follow from that, and they apply to every ring we looked at:

• It's a trend, not a reading. The brands talk about patterns, dips and insights, not a number you could write in a blood pressure log.
• The better ones lean on a cuff anyway. Circular calibrates against your own cuff. RingConn takes optional manual blood pressure inputs. If you need a cuff to make the ring's estimate meaningful, the cuff is the tool.
• None is FDA-cleared. As of September 19, 2026, we found no smart ring with an FDA-cleared blood pressure feature.

This is the same pattern we see across health features on rings: the heart and sleep data have published evidence behind them, and the interpretations built on top mostly don't. Our smart ring accuracy guide covers what the studies do support, and the accuracy hub has the rest.

What Oura, RingConn and Circular offer

Oura: Blood Pressure Signals

Oura's Ring 5 page says: “Know how your blood pressure patterns evolve over time, with Nighttime BP examining your overnight dips for long-term trends.” It also lists Cardiovascular Age, to “understand how your cardiovascular system is aging relative to your chronological age.” Neither is FDA-cleared. MedTech Dive reported in October 2025 that Oura is pursuing FDA clearance of a blood pressure feature for its rings (MedTech Dive), and we found no clearance as of September 19, 2026.

For this site's reader, there's a cost angle too. Oura's list of what works without the membership is your three daily scores, ring battery, basic profile, app settings and the Explore content. Blood Pressure Signals isn't on it. The membership is $5.99 a month or $69.99 a year; our Oura membership cost guide has the full math.

RingConn Gen 3: Vascular Health Insights

RingConn says Gen 3 integrates “nighttime vascular load patterns, optional manual blood pressure inputs, and lifestyle factors to deliver personalized blood pressure trend insights” (RingConn). It charges no subscription. RingConn is also clear about what it isn't: the ring is “not a medical device,” its services “are not designed to diagnose, treat, cure, or prevent any disease,” and in a February 2026 blog post RingConn wrote, “we're not claiming to replace medical devices. Instead, Gen 3 helps you to identify patterns and changes that might warrant a conversation with your healthcare provider.” That's the right way to use it. Our RingConn Gen 3 review covers the ring as a whole.

Circular Ring 2: calibrated against your cuff

Circular's wording is the most candid of the three: “It does not replace a cuff and it is not a diagnosis,” and “Circular is not a diagnostic device and does not replace medical advice.” Circular's homepage makes no FDA clearance claim for the ring. It's sold only from Circular's own store. More in our Circular Ring 2 review.

Where the FDA stands on ring blood pressure

No brand page we checked claims an FDA-cleared blood pressure feature on a smart ring. So how can these features be sold at all? The answer is the FDA's general wellness policy. In January 2026 the FDA revised its General Wellness guidance, and Oura's summary of it says that “non-invasive wearables estimating blood pressure...can qualify as general wellness products if they are strictly wellness-focused” ( Oura blog, February 10, 2026).

In plain terms: a ring can offer blood pressure trend estimates as a wellness feature, as long as it stays wellness-focused. That is a different thing from a cleared device you'd use to manage blood pressure. Two honest caveats about that source: it's Oura's summary of the guidance, not the FDA document itself, and Oura has a commercial interest in how the guidance is read.

Glucose: the FDA's warning

On glucose, the FDA has been blunt. Its safety communication of February 21, 2024 is titled “Do Not Use Smartwatches or Smart Rings to Measure Blood Glucose Levels.” It says: “The FDA has not authorized, cleared, or approved any smartwatch or smart ring that is intended to measure or estimate blood glucose values on its own” (FDA).

Note the words “on its own.” The warning is about a ring or watch that claims to measure glucose by itself. And the reason is concrete: “For people with diabetes, inaccurate blood glucose measurements can lead to errors in diabetes management, including taking the wrong dose of insulin.”

So if you searched for the best smart ring for glucose monitoring, the honest answer is that there isn't one to recommend. A listing that claims otherwise is making a claim the FDA has specifically warned about.

Why this page has no picks

Almost every page on this site ends with rings we'd point you to. This one doesn't, on purpose. No smart ring sold in the US has FDA clearance to measure blood pressure or blood glucose, and the FDA has warned against using smartwatches or smart rings to measure glucose. Recommending a ring for a capability it doesn't have would mislead you, and on a health question that's a line we won't cross. Our health-content rules explain the policy.

If you want a ring for what rings do have evidence for, overnight heart rate, HRV and sleep, start with the best smart rings without a subscription or the best smart ring for sleep tracking. And if you want to check those numbers yourself, a chest strap is the reference (see the best chest strap for HRV and our test your ring against a chest strap protocol). There's no equivalent home check that turns a ring's blood pressure trend into a reading.

How to judge any ring health claim

Blood pressure and glucose won't be the last health features rings advertise. The same four questions sort the real from the marketing every time:

1. What exactly does the brand call it? “Signals,” “insights,” “trends” and “patterns” are wellness words. A measurement you could act on would be described as one, with a regulatory status to match.
2. Is it cleared, and for what? Samsung's announced clearance is for sleep apnea risk detection, not blood pressure. A clearance covers a specific feature, not the whole ring.
3. Is there a study against the real reference? For blood pressure that's a cuff. We found no published study in our evidence library that validated a ring's blood pressure trend against one.
4. Does it cost you every month? A feature behind a membership keeps costing as long as you want to see it. That's worth knowing before the claim persuades you.

What to use instead

• For blood pressure: a cuff. It's the tool Circular calibrates against and the one RingConn's optional inputs come from. Ask a clinician which kind suits you and how to take readings. We haven't researched cuffs for this site, so we don't recommend a specific one here.
• For glucose: the testing your clinician recommends. Not a ring or a watch on its own, per the FDA.
• For a ring trend that worries you: a clinician. RingConn's own framing is the right one: a pattern that “might warrant a conversation with your healthcare provider.”

A ring's blood pressure trend can still be interesting as a personal log if you already have one, the same way a stress or temperature trend can (see smart ring stress tracking and smart ring temperature tracking). Just don't buy a ring, or pay for a membership, because of it.

Mistakes to avoid

• Reading a trend as a number. Ring features describe patterns and dips, not a blood pressure you can log.
• Changing medication because of a ring. The FDA's glucose warning names the wrong insulin dose as the risk. Talk to your clinician first, every time.
• Paying a membership for a blood pressure feature. The fee runs for as long as you want to see the trend (the math is above), and Blood Pressure Signals isn't FDA-cleared.
• Believing an “FDA-cleared” claim you can't trace. If a ring or listing claims clearance, look for the brand's own statement of it and what exactly was cleared. A listing's say-so isn't enough.
• Mixing up Samsung's announcement. The FDA clearance Samsung announced for the Galaxy Ring is for sleep apnea risk detection, and it hadn't shipped when we checked.