The short answer is no, an Apple Watch does not measure your blood pressure, and it will not show you a systolic and diastolic reading. What recent models can do is something more subtle. After about a month of normal wear, the watch can send you a notification if its optical sensor has picked up a pattern consistent with high blood pressure. That is a useful screening tool, and it is worth understanding properly, because the difference between a measurement and a notification matters a lot when you are deciding what to do about it. Here is how the feature works, which watches have it, how accurate the FDA says it is, and what to do if you get an alert.
Disclosure: Fitcoin is our product. We are not affiliated with Whoop, Oura, Google, Fitbit, Garmin, Polar, Amazfit, Xiaomi, Samsung, Suunto, Apple, Huawei, Hume Health or any other brand named on this page. We do not sell trackers and we take no affiliate commission. Where Fitcoin appears, it is as the rewards and insights app that reads the data these devices and workouts write to Apple Health or Health Connect. Everything below is a wellness estimate for general fitness, not medical advice.
What hypertension notifications actually do
The feature uses the same green-light optical heart sensor the watch already relies on for your pulse. Apple's validation paper describes a model trained on photoplethysmography data from more than 100,000 people, which looks at how your blood vessels respond to each heartbeat and then aggregates those signals over discrete 30-day windows. If the pattern suggests hypertension, you get a notification. If it does not, you hear nothing. There is no reading in millimetres of mercury, no calibration step, and no daily graph of your blood pressure of the kind that Hume's band tries to draw.
The eligibility rules are strict, and they are a meaningful part of the design. According to Apple Support, you need an Apple Watch Series 9 or later, or an Ultra 2 or later, running a recent version of watchOS. The Apple Watch SE is not included. You also need an iPhone 11 or later, wrist detection turned on, and you must be 22 or older. The feature is not available if you are pregnant, and logging a pregnancy in the Health app disables it. It is also not intended for anyone who already has a hypertension diagnosis. Apple is explicit that this is not a tool for monitoring whether treatment is working; it is a screening nudge for adults who have never been told they have high blood pressure.
One 2026 detail that catches people out: Apple's support page notes that hypertension notifications may not yet be available on the Apple Watch Series 12 or Ultra 4 in some regions, because additional regulatory clearances for those models are still being processed. If you have bought the newest watch and cannot find the setting, that is the likely reason, and Apple's feature availability page will tell you where things stand for your country before you start resetting anything.
How accurate it is, according to the FDA
The most useful numbers come from the FDA's clearance summary, K250507, rather than from Apple's keynote. In the pivotal study, the feature's sensitivity was 41.2 percent, with a confidence interval of 37.2 to 45.3 percent, and its specificity was 92.3 percent, with a confidence interval of 90.6 to 93.7 percent. Sensitivity is the proportion of people who have hypertension and receive a notification. Specificity is the proportion of people who do not have it and correctly receive nothing. In plain terms, when the watch does notify you, it is usually onto something real. When it stays quiet, it has missed more than half of the people a proper check would have flagged. For stage 2 hypertension, the more serious category, sensitivity was higher at 53.7 percent, which is better but still leaves a lot of people unnotified.
That balance is intentional. A screening feature that sent false alarms every week would be switched off and ignored, so Apple chose to make it conservative and accept a high miss rate in exchange for notifications you can take seriously. The FDA summary spells out the implications: the absence of a notification does not mean the absence of hypertension, and the feature is not intended for diagnosis, treatment management or ongoing blood-pressure surveillance.
Apple's 2025 newsroom announcement described the clinical validation as involving more than 2,000 participants and said the company expected the feature to notify over a million people with undiagnosed hypertension in its first year, simply because so many watches are in use. That is really the argument for it: reach rather than precision. In the FDA's subgroup analysis, older adults and people with a higher BMI saw higher sensitivity and slightly lower specificity, while sex, race and skin tone showed no differences Apple considered clinically meaningful after adjustment. Those are population findings, though, and they cannot tell you how the feature will perform on your particular wrist.
What to do if you get a notification
Apple's guidance is the standard one, and it lines up with the American Heart Association's advice to confirm at home. Set up the blood-pressure log in the Health app and take readings with a separate, validated upper-arm cuff for seven days. Sit quietly, support your arm, and record the results. Then take that week of data to a clinician. It is important not to conclude you have hypertension because a watch used the word, and equally important not to assume you are fine because a friend with the same watch never got an alert. The same miss rate applies to everyone.
A small practical note: if you use a second iPhone that is not the one paired with your watch, Apple says the notification may be delayed until your primary phone is unlocked and finishes its analysis. That explains the occasional story of a partner spotting the alert before the wearer did.
And one thing this feature is emphatically not: a heart-attack detector. If you have chest pain, the watch cannot help with that, and the next step is emergency services rather than a seven-day log.
If what you really want is a number
If you were hoping for an actual reading, the honest answer is that you want a cuff, and the Apple Watch will not become one through a software update, because optical sensing never squeezes the artery. Among wearables that do show a figure, Hume's band displays an estimated pair and presents it as a trend. Whoop's MG, on the Life membership, shows an estimated range after a cuff reading during setup; our guide to whether Whoop measures blood pressure explains the details. Huawei's Watch D3 is the only one of the group with an inflatable cuff built into the strap, which makes it a genuine blood-pressure monitor you happen to wear as a watch; our Watch D3 review covers how that works in practice.
For most people, though, the sensible move is to leave the Apple notification switched on if you are eligible, are not pregnant, and have never been diagnosed. It costs nothing once you own the watch, it needs no calibration, and the worst outcome of a false alarm is a week of cuff readings. Just keep in mind what it is doing: watching a month of pulses and, now and then, raising a hand to say it might be worth checking. For more on how the watch's optical sensor performs in general, our Apple Watch heart-rate accuracy study roundup goes into the research.
Sources: Apple Support's page on hypertension notifications, Apple's September 2025 clinical validation paper, and the FDA 510(k) summary K250507, all checked 2 November 2026. The sensitivity and specificity figures are from the FDA summary. This article is general information, not medical advice.
Related: Hume Band blood pressure accuracy, does Whoop measure blood pressure?, Huawei Watch D3 review, Apple Watch heart-rate accuracy.
Frequently asked questions
Does Apple Watch measure blood pressure?
No. It does not display a blood-pressure reading. On Series 9 and later and Ultra 2 and later, it can send a hypertension notification if its optical sensor detects a pattern consistent with high blood pressure over a 30-day period. That is a screening alert, not a measurement.
Which Apple Watch models have hypertension notifications?
Apple Watch Series 9 and later, and Apple Watch Ultra 2 and later, paired with an iPhone 11 or newer. The SE does not support it. Apple notes that the Series 12 and Ultra 4 may not have the feature in some regions yet while regulatory clearances are completed.
How accurate are Apple Watch hypertension notifications?
According to the FDA clearance summary, sensitivity was 41.2 percent and specificity was 92.3 percent. That means a notification is usually meaningful, but the absence of one does not rule out high blood pressure, since the feature misses more than half of cases.
Who should not turn hypertension notifications on?
Apple says the feature is not for people under 22, people who are pregnant, or people who already have a hypertension diagnosis. It is designed to screen adults who have not been diagnosed, not to monitor treatment.
What should I do if I get a notification?
Follow Apple's guidance: take readings with a validated upper-arm cuff for seven days using the blood-pressure log in the Health app, then share the results with a clinician. Do not change any medication or make a diagnosis based on the watch alone.
About the author: Harris Khan is the co-founder and CTO of Fitcoin, a UK fitness-rewards and health-insights app that reads Apple Health and Health Connect.