Accuracy of Smartwatches With a Built-In Blood Pressure Cuff
Question assessedAre smartwatches with a small inflatable cuff in the strap, such as the Huawei Watch D and D2 or Omron HeartGuide, accurate for blood pressure?
In standard validation tests, yes: the Huawei Watch D and D2 met the international accuracy standard for home monitors at rest. In independent tests on patients outside those protocols, no: in 41 hypertensive outpatients the Watch D2 underread systolic pressure by 6.8 mmHg on average, and in 100 patients from a real-world clinic sample none of three wrist watches, including the Omron HeartGuide, passed every criterion of the standard.
Why this is rated Uncertain
A watch with a real cuff measures pressure the way a home arm monitor does, by inflating and reading the pulse in the cuff, so it can be validated against the same AAMI/ESH/ISO standard. Three studies of the Huawei Watch D and D2 report that it met that standard at rest, one also in an ambulatory test, which are the clean anchors.
Independent studies in patients contradict it. The European Society of Hypertension consensus found static validations generally acceptable but only two devices validated to established standards and little data for 24-hour use. With affirming anchors and core-hitting conflicts, the rule rates the claim Uncertain.
- Anchor-grade evidence affirms the core relationship.
- An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.
- A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.
Key results
- In the Huawei Watch D2 rest validation of 85 analyzed subjects, mean differences from reference readings were -1.6 ± 6.4 mmHg systolic and -1.9 ± 5.0 mmHg diastolic, meeting the AAMI/ESH/ISO universal standard. (Zhou et al., Hypertension Research, 2025)
- Worn alongside a validated ambulatory monitor for 24 hours by 41 hypertensive outpatients, the Watch D2 underestimated systolic pressure with a mean bias of -6.8 mmHg and wide limits of agreement; systolic concordance was poor (ICC 0.38), and only 47 percent of systolic and 61 percent of diastolic readings fell within the agreement bands the study applied. (Seoane-Casqueiro et al., Revista Clinica Espanola, 2026)
- Of 128 patients enrolled (median age 53, 46 percent on blood pressure medication) and 100 analyzed, the Bpro G2, Omron HeartGuide and Heartisans watches each had mean values within 5 mmHg of sphygmomanometry but none passed all ISO 81060-2 criteria, and the Omron watch underestimated systolic pressure by 8.46 mmHg in adjusted analyses. (Lunardi et al., Clinical Research in Cardiology, 2024)
What this finding covers
Applies to: Wrist-watch blood pressure monitors with an inflatable cuff in the strap, at rest and over 24 hours, compared with validated cuff devices.
Does not cover: Cuffless optical estimates, covered in separate findings; diagnosis or treatment decisions; devices not tested.
Limitations
- The passing validations are of one manufacturer’s devices, and some independent tests used small samples.
- Validation protocols test resting, seated readings; real-world 24-hour wear adds movement and position changes.
Evidence base
9 studies scored · 4 anchor · 3 conflicting · 2 supporting · Evidence last evaluated Oct 19, 2026
Anchor studies
The studies the rating rests on.
- Wearable wrist-watch type cuff oscillometric blood pressure monitors: consensus statement by the European Society of Hypertension Working Group on blood pressure monitoring.
- Accuracy and Reduced Sleep Disruption of a Wearable Smartwatch for Nocturnal Blood Pressure Monitoring: A Validation Study.
- Accuracy of a wearable watch-type oscillometric blood pressure monitor in rest and ambulatory blood pressure measurements.
- Validation of the watch-type HUAWEI WATCH D oscillometric wrist blood pressure monitor in adult Chinese.
Conflicting studies
Studies whose findings run against the claim.
- Clinical reliability of a wrist-worn oscillometric ambulatory blood pressure monitor: an independent agreement evaluation.
- Comparison of blood pressure measurements between the Huawei Watch D smartwatch application and the validated Omron M3 Intellisense device: Observational study.
- Performance of wearable watch-type home blood pressure measurement devices in a real-world clinical sample.
Supporting studies
Studies consistent with the claim that do not carry the rating on their own.
- The quest for accurate wearable blood pressure monitors.
- WATCH-BPM-Comparison of a WATCH-Type Blood Pressure Monitor with a Conventional Ambulatory Blood Pressure Monitor and Auscultatory Sphygmomanometry.
Version history
| Version | Date | Rating | Change |
|---|---|---|---|
| 1.0 | October 24, 2026 | Uncertain | First published. |
Rating history on the research desk: Uncertain (October 19, 2026).
Cite this finding
KnowYourPrime Evidence Registry, Finding KYP-ER-0020, version 1.0, reviewed 2026-10-24. https://knowyourprime.com/evidence-smartwatch-cuff-blood-pressure-accuracy
Machine-readable: JSON · Markdown · All findings
Related
- Research desk: the blood pressure research desk entry for this question, with every scored study and its role
- Related finding: Cuffless Blood Pressure Accuracy at Night (KYP-ER-0021)
- Related finding: Do Calibrated Cuffless Blood Pressure Readings Track Real Changes? (KYP-ER-0022)
- On this site: Can a Smartwatch or Ring Really Measure Blood Pressure?
- On this site: Blood Pressure by Age: What's Normal for Men and Women?
This is KnowYourPrime's own assessment of the published evidence, rated under the KnowYourPrime evidence methodology. The rating is set by a fixed rule from the roles of the studies above and moves only when the evidence or the rule changes. Every change to the rating or the text is published as a new dated version. To report an error, write to corrections@knowyourprime.com.