Samsung’s Galaxy Watches have been able to measure your blood pressure for years now—theoretically. U.S. users just got access to the feature, in a phased rollout that finally reached my device. I’ll show you how to set it up, which is more complicated than you might think, and then discuss what we know about its accuracy.
Samsung Galaxy Watch 8 (2025) 40 mm LTE $329.99 at Amazon $399.99 Save $70.00 Shop Now Shop Now $329.99 at Amazon $399.99 Save $70.00Besides a Samsung Galaxy phone and watch, you’ll need two things to set up blood pressure monitoring: access to a blood pressure cuff (a wrist cuff from the drugstore is fine) and a cellular network connection (not wifi).
The blood pressure cuff is needed to calibrate the watch’s readings. Once you install the Samsung Health Monitor app and tell it you’re ready to calibrate, it will ask you to sit quietly and take three readings from the cuff. Before you start, the app warns you to avoid “exercise, bathing, alcohol, caffeine, and nicotine” for 30 minutes.
Even though both readings are taken at the same time—the watch on one arm, your cuff on the other—you have to sit quietly until the watch is done. Moving around after the cuff finishes, but while the watch reading is still going, can result in a null result that requires you to redo the watch reading. The app didn’t recommend a waiting period between readings, but some blood pressure guidelines mention that you should wait about two minutes between readings.
Where to get a blood pressure cuff
But if you’re interested in tracking your blood pressure, it probably makes sense to get your own cuff anyway. A basic wrist cuff shouldn’t cost more than about $20-30 and you can grab one from Amazon or any pharmacy. I already had one of these, so that’s what I used.
Samsung recommends an arm cuff if possible, like this $49 model. These are supposed to be a bit more accurate than the wrist cuffs. Both types will inflate themselves and do the reading automatically, so you don’t need any special expertise to operate them, nor even any help to do the reading while you’re keeping an eye on your phone and watch.
iHealth Upper Arm Blood Pressure Monitor $39.99 at Amazon $49.98 Save $9.99 Shop Now Shop Now $39.99 at Amazon $49.98 Save $9.99Are the readings accurate?
This Korean study from 2022 concludes that the Galaxy Watch blood pressure technology has a “systematic bias” toward the calibration readings. That means it will underestimate high blood pressure and overestimate low blood pressure. This is the same phenomenon I see Whoop MG users complain about—they say the device tends report blood pressure numbers that are similar to their last measurement that was taken without the device. At that point, is the device really adding anything?
But more importantly, the society recommended against using smartwatch measurements for blood pressure for people who are pregnant or have any of a variety of health conditions, or are taking certain medications. The blood vessels change during pregnancy in ways that could confuse a smartwatch-based sensor. The other health conditions and medications mentioned are: “aortic valve insufficiency with wide pulse pressure, atrial fibrillation with considerable beat-to-beat variability, peripheral vascular disease with weak perfusion, diabetes, cardiomyopathy, ESRD, neurological disorders such as hand tremor, blood clotting disorder, or taking antiplatelet agents / anticoagulants.”
The society also said that smartwatch blood pressure readings aren’t reliable for a pressure below 60 mmHg or a systolic (top number) pressure above 160 mmHg, and may not be reliable enough for people who already have hypertension and need to monitor it. But after all those caveats, they speak favorably about the idea that people who want to measure their blood pressure from a watch are at least thinking about their blood pressure, and those who have hypertension may end up getting diagnosed earlier because they’re checking it regularly.
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