---
title: "Wearable Heart Rate Accuracy | KnowYourPrime Evidence Registry"
description: "Finding KYP-ER-0009, rated Established. Yes, at rest and in steady activity, which is the best-established accuracy finding for consumer wearables. Agreement falls during vigorous or irregular movement such as resistance training, and some brands track better than others."
url: https://knowyourprime.com/evidence-wearable-heart-rate-accuracy
---

KnowYourPrime Evidence Registry · Finding KYP-ER-0009

# Wearable Heart Rate Accuracy

Question assessedDo wrist wearables measure heart rate accurately against a chest strap or ECG?

KnowYourPrime evidence rating Established Strong, consistent evidence supports the claim.

Yes, at rest and in steady activity, which is the best-established accuracy finding for consumer wearables. Agreement falls during vigorous or irregular movement such as resistance training, and some brands track better than others.

Finding KYP-ER-0009 Version 1.0 Reviewed October 24, 2026 Rating rule 1.4 [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)

## Why this is rated Established

Wrist heart rate is counted from pulses of blood detected by light. It is far easier to get right than HRV or blood oxygen, because a few missed beats change the rate very little.

Systematic reviews covering hundreds of validation studies find reasonably accurate heart rate across brands, and a meta-analysis of wrist pulse sensors against ECG found acceptable validity for most common activities. Other reviews note heterogeneity and how few devices have been tested, but nothing contradicts the core relationship, so the rule rates it Established.

How the rating rule reads this evidence

- Systematic-review or meta-analytic evidence affirms the core relationship.
- Multiple supporting studies are consistent with the core relationship.
- Some evidence conflicts on secondary points that do not change the core direction.

## Key results

- A review of 158 publications across nine brands found heart rate measured accurately in laboratory settings, with Apple Watch and Garmin the most accurate and Fitbit tending to underestimate; energy expenditure was not accurate for any brand. (Fuller et al., JMIR mHealth and uHealth, 2021)
- An umbrella review of 24 systematic reviews and 249 validation studies found a mean heart rate bias of about 3 percent, while also finding only about 11 percent of devices released had been validated for any outcome. (Doherty et al., Sports Medicine, 2024)
- A meta-analysis of 44 studies and 738 effect sizes found wrist pulse sensors acceptably valid against ECG or chest straps for most common activities, with degradation during resistance training. (Zhang et al., Journal of Sports Sciences, 2020)

## What this finding covers

**Applies to:** Heart rate from consumer wrist wearables at rest and during common activities, compared with ECG or chest straps.

**Does not cover:** HRV, which is far more sensitive to error; arrhythmia detection; step counts with mobility aids, which are less accurate; calorie estimates, covered in a separate finding.

## Limitations

- Most devices on sale have never been independently validated.
- Results for one model do not transfer to its successors.

## Evidence base

59 studies scored · 5 anchor · 1 conflicting · 53 supporting · 1 letters or comments not counted · Evidence last evaluated Oct 15, 2026

### Anchor studies

The studies the rating rests on.

1. Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.Doherty et al., Sports Medicine, 2024. [doi.org/10.1007/s40279-024-02077-2](https://doi.org/10.1007/s40279-024-02077-2)
2. Accuracy and Acceptability of Wrist-Wearable Activity-Tracking Devices: Systematic Review of the Literature.Germini et al., Journal of Medical Internet Research, 2022. [doi.org/10.2196/30791](https://doi.org/10.2196/30791)
3. Accuracy and Precision of Energy Expenditure, Heart Rate, and Steps Measured by Combined-Sensing Fitbits Against Reference Measures: Systematic Review and Meta-analysis.Chevance et al., JMIR mHealth and uHealth, 2022. [doi.org/10.2196/35626](https://doi.org/10.2196/35626)
4. Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review.Fuller et al., JMIR mHealth and uHealth, 2021. [doi.org/10.2196/18694](https://doi.org/10.2196/18694)
5. Validity of Wrist-Worn photoplethysmography devices to measure heart rate: A systematic review and meta-analysis.Zhang et al., Journal of Sports Sciences, 2020. [doi.org/10.1080/02640414.2020.1767348](https://doi.org/10.1080/02640414.2020.1767348)

### Conflicting studies

Studies whose findings run against the claim.

1. Activity trackers are not valid for step count registration when walking with crutches.Ridder et al., Gait & Posture, 2019. [doi.org/10.1016/j.gaitpost.2019.02.009](https://doi.org/10.1016/j.gaitpost.2019.02.009)

### Supporting studies

Studies consistent with the claim that do not carry the rating on their own.

**Show all 53 supporting studies**

1. Analysis of a Medically Certified, Wrist-Worn Sensor for the Assessment of Heart Rate and Energy Expenditure During Daily Activities in Patients With Chronic Heart Failure or Coronary Artery Disease and Recreational Athletes: Validation Study.Lathauwer et al., JMIR Cardio, 2026. [doi.org/10.2196/69343](https://doi.org/10.2196/69343)
2. Comparison of consumer-grade wearable devices with a research-grade instrument for measuring physical activity in a free-living setting.Miwa et al., PloS One, 2026. [doi.org/10.1371/journal.pone.0342543](https://doi.org/10.1371/journal.pone.0342543)
3. Consumer Smartwatch Technology in Health and Performance Research: Validity, Limitations, and Real-World Applications.Lepley et al., Sensors, 2026. [doi.org/10.3390/s26144486](https://doi.org/10.3390/s26144486)
4. Fitbit Sense 2 in hospitalized general medicine patients: A pilot study assessing feasibility and validity of specific measures.Lee et al., International Journal of Medical Informatics, 2026. [doi.org/10.1016/j.ijmedinf.2026.106704](https://doi.org/10.1016/j.ijmedinf.2026.106704)
5. Is my smartwatch a valid witness? A systematic review and meta-analysis.Sicbaldi et al., Forensic Science International, 2026. [doi.org/10.1016/j.forsciint.2026.112901](https://doi.org/10.1016/j.forsciint.2026.112901)
6. Performance Evaluation of Device-Based Algorithms to Estimate Step Counts in Free-Living Adults Compared with Direct Observation.Hyde et al., Medicine and Science in Sports and Exercise, 2026. [doi.org/10.1249/MSS.0000000000003989](https://doi.org/10.1249/MSS.0000000000003989)
7. Validation of a novel multi-sensor wearable for measuring heart rate, steps, and energy expenditure in laboratory and simulated free-living protocols.Kim et al., Physiological Measurement, 2026. [doi.org/10.1088/1361-6579/ae76b8](https://doi.org/10.1088/1361-6579/ae76b8)
8. Validation of a wireless device-driven method of estimating caloric expenditure during running.Cronen et al., Applied Physiology, Nutrition, and Metabolism, 2026. [doi.org/10.1139/apnm-2025-0395](https://doi.org/10.1139/apnm-2025-0395)
9. Accuracy of energy expenditure estimation by the Apple Watch in EMS-supported exercise.Heinz et al., Physiological Measurement, 2025. [doi.org/10.1088/1361-6579/adfcaf](https://doi.org/10.1088/1361-6579/adfcaf)
10. Accurate measurement of simulated slow and altered walking activity: Apple Watch best in class wearable devices.Rowe et al., PloS One, 2025. [doi.org/10.1371/journal.pone.0333504](https://doi.org/10.1371/journal.pone.0333504)
11. Aggregation Periods Influence Step Count Error in Low-Power Wearables.Lundell et al., Sensors, 2025. [doi.org/10.3390/s25226998](https://doi.org/10.3390/s25226998)
12. Apple watch accuracy in monitoring health metrics: a systematic review and meta-analysis.Choe et al., Physiological Measurement, 2025. [doi.org/10.1088/1361-6579/adca82](https://doi.org/10.1088/1361-6579/adca82)
13. Benchmarking open-source step counting algorithms for wrist-worn devices.Salvi et al., Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference, 2025. [doi.org/10.1109/EMBC58623.2025.11253635](https://doi.org/10.1109/EMBC58623.2025.11253635)
14. Comparison of Students' Physical Activity at Different Times and Establishment of a Regression Model for Smart Fitness Trackers.Cheng et al., Sensors, 2025. [doi.org/10.3390/s25061726](https://doi.org/10.3390/s25061726)
15. Step Count Accuracy of the Life Plus Connected Watch at Different Localizations and Speeds in Healthy Adults, Patients With Cardiovascular Disease, and Patients With Peripheral Artery Disease: Step Count Validation Study in Laboratory Settings.Heizmann et al., JMIR Formative Research, 2025. [doi.org/10.2196/58964](https://doi.org/10.2196/58964)
16. The Effect of Assistive Devices on the Accuracy of Fitbits in Healthy Individuals: A Brief Report.Jaworski et al., International Journal of Environmental Research and Public Health, 2025. [doi.org/10.3390/ijerph22071100](https://doi.org/10.3390/ijerph22071100)
17. Using Free-Living Heart Rate Data as an Objective Method to Assess Physical Activity: A Scoping Review and Recommendations by the INTERLIVE-Network Targeting Consumer Wearables.Schumann et al., Sports Medicine, 2025. [doi.org/10.1007/s40279-024-02159-1](https://doi.org/10.1007/s40279-024-02159-1) \[conflict statement: the research network is partly funded by Huawei\]
18. Validation of an Open-Source Smartwatch for Continuous Monitoring of Physical Activity and Heart Rate in Adults.Ravanelli et al., Sensors, 2025. [doi.org/10.3390/s25092926](https://doi.org/10.3390/s25092926)
19. Validity of four low-cost smartwatches in estimating energy expenditure during cycling in Chinese untrained women.Liu et al., PloS One, 2025. [doi.org/10.1371/journal.pone.0331399](https://doi.org/10.1371/journal.pone.0331399)
20. Wearable technology for mobility measurement in orthopedics and traumatology: a comparison of commercially available systems.Keppler et al., Archives of Orthopaedic and Trauma Surgery, 2025. [doi.org/10.1007/s00402-025-05803-1](https://doi.org/10.1007/s00402-025-05803-1)
21. Criterion-Related Validity of Consumer-Wearable Activity Trackers for Estimating Steps in Primary Schoolchildren under Controlled Conditions: Fit-Person Study.Mayorga-Vega et al., Journal of Sports Science & Medicine, 2024. [doi.org/10.52082/jssm.2024.79](https://doi.org/10.52082/jssm.2024.79)
22. Raw Photoplethysmography as an Enhancement for Research-Grade Wearable Activity Monitors.Hibbing et al., JMIR mHealth and uHealth, 2024. [doi.org/10.2196/57158](https://doi.org/10.2196/57158)
23. Validation of steps countering recorded with a smartwatchCYROL et al., The Journal of Sports Medicine and Physical Fitness, 2024. [doi.org/10.23736/S0022-4707.24.15888-4](https://doi.org/10.23736/S0022-4707.24.15888-4)
24. Validity of a Consumer-Based Wearable to Measure Clinical Parameters in Patients With Chronic Obstructive Pulmonary Disease and Healthy Controls: Observational Study.Hermans et al., JMIR mHealth and uHealth, 2024. [doi.org/10.2196/56027](https://doi.org/10.2196/56027)
25. Assessment of 24-hour physical behaviour in adults via wearables: a systematic review of validation studies under laboratory conditions.Giurgiu et al., The International Journal of Behavioral Nutrition and Physical Activity, 2023. [doi.org/10.1186/s12966-023-01473-7](https://doi.org/10.1186/s12966-023-01473-7)
26. Validity of Apple Watch 6 and Polar A370 for monitoring energy expenditure while resting or performing light to vigorous physical activity.Sun et al., Journal of Science and Medicine in Sport, 2023. [doi.org/10.1016/j.jsams.2023.07.005](https://doi.org/10.1016/j.jsams.2023.07.005)
27. Wearable Device Validity in Measuring Steps, Energy Expenditure, and Heart Rate Across Age, Gender, and Body Mass Index: Data Analysis From a Systematic Review.Musa et al., Journal of Physical Activity & Health, 2023. [doi.org/10.1123/jpah.2022-0160](https://doi.org/10.1123/jpah.2022-0160)
28. Wrist-worn devices for the measurement of heart rate and energy expenditure: A validation study for the Apple Watch 6, Polar Vantage V and Fitbit Sense.Hajj-Boutros et al., European Journal of Sport Science, 2023. [doi.org/10.1080/17461391.2021.2023656](https://doi.org/10.1080/17461391.2021.2023656)
29. A catalog of validity indices for step counting wearable technologies during treadmill walking: the CADENCE-adults study.Mora-Gonzalez et al., The International Journal of Behavioral Nutrition and Physical Activity, 2022. [doi.org/10.1186/s12966-022-01350-9](https://doi.org/10.1186/s12966-022-01350-9)
30. A meta-analysis of Fitbit devices: same company, different models, different validity evidence.Leung et al., Journal of Medical Engineering & Technology, 2022. [doi.org/10.1080/03091902.2021.2006350](https://doi.org/10.1080/03091902.2021.2006350)
31. Are Wrist-Worn Activity Trackers and Mobile Applications Valid for Assessing Physical Activity in High School Students? Wearfit Study.Viciana et al., Journal of Sports Science & Medicine, 2022. [doi.org/10.52082/jssm.2022.356](https://doi.org/10.52082/jssm.2022.356)
32. Quality Evaluation of Free-living Validation Studies for the Assessment of 24-Hour Physical Behavior in Adults via Wearables: Systematic Review.Giurgiu et al., JMIR mHealth and uHealth, 2022. [doi.org/10.2196/36377](https://doi.org/10.2196/36377)
33. Recommendations for Determining the Validity of Consumer Wearables and Smartphones for the Estimation of Energy Expenditure: Expert Statement and Checklist of the INTERLIVE Network.Argent et al., Sports Medicine, 2022. [doi.org/10.1007/s40279-022-01665-4](https://doi.org/10.1007/s40279-022-01665-4) \[funding listed from Huawei\]
34. Step-count outcomes of 13 different activity trackers: Results from laboratory and free-living experiments.Nakagata et al., Gait & Posture, 2022. [doi.org/10.1016/j.gaitpost.2022.08.004](https://doi.org/10.1016/j.gaitpost.2022.08.004) \[conflict statement: an author received research funding from Omron, whose trackers were among those tested\]
35. Wearable activity trackers-advanced technology or advanced marketing?Shei et al., European Journal of Applied Physiology, 2022. [doi.org/10.1007/s00421-022-04951-1](https://doi.org/10.1007/s00421-022-04951-1)
36. Factors associated with validity of consumer-oriented wearable physical activity trackers: a meta-analysis.Leung et al., Journal of Medical Engineering & Technology, 2021. [doi.org/10.1080/03091902.2021.1893395](https://doi.org/10.1080/03091902.2021.1893395)
37. Recommendations for determining the validity of consumer wearable and smartphone step count: expert statement and checklist of the INTERLIVE network.Johnston et al., British Journal of Sports Medicine, 2021. [doi.org/10.1136/bjsports-2020-103147](https://doi.org/10.1136/bjsports-2020-103147)
38. Sensing leg movement enhances wearable monitoring of energy expenditure.Slade et al., Nature Communications, 2021. [doi.org/10.1038/s41467-021-24173-x](https://doi.org/10.1038/s41467-021-24173-x)
39. A Step in the Right Direction: Body Location Determines Activity Tracking Device Accuracy in Total Knee and Hip Arthroplasty Patients.Goel et al., The Journal of the American Academy of Orthopaedic Surgeons, 2020. [doi.org/10.5435/JAAOS-D-18-00319](https://doi.org/10.5435/JAAOS-D-18-00319)
40. Accuracy of the Multisensory Wristwatch Polar Vantage's Estimation of Energy Expenditure in Various Activities: Instrument Validation Study.Gilgen-Ammann et al., JMIR mHealth and uHealth, 2020. [doi.org/10.2196/14534](https://doi.org/10.2196/14534)
41. Feasibility of Commercially Marketed Health Devices for Potential Clinical Application.Uchimura et al., Critical Reviews in Biomedical Engineering, 2020. [doi.org/10.1615/CritRevBiomedEng.2019026110](https://doi.org/10.1615/CritRevBiomedEng.2019026110)
42. Fitness band accuracy in older community dwelling adults.Madigan et al., Health Informatics Journal, 2020. [doi.org/10.1177/1460458217720399](https://doi.org/10.1177/1460458217720399)
43. Standardizing Analytic Methods and Reporting in Activity Monitor Validation Studies.Welk et al., Medicine and Science in Sports and Exercise, 2020. [doi.org/10.1249/MSS.0000000000001966](https://doi.org/10.1249/MSS.0000000000001966)
44. Validity of Wrist-Worn Activity Trackers for Estimating VO 2max and Energy Expenditure.Passler et al., International Journal of Environmental Research and Public Health, 2020. [doi.org/10.3390/ijerph16173037](https://doi.org/10.3390/ijerph16173037)
45. Assessment of step accuracy using the Consumer Technology Association standard.Bunn et al., Journal of Sports Sciences, 2019. [doi.org/10.1080/02640414.2018.1491941](https://doi.org/10.1080/02640414.2018.1491941)
46. Step count accuracy of StepWatch and FitBit One™ among individuals with a unilateral transtibial amputation.Arch et al., Prosthetics and Orthotics International, 2019. [doi.org/10.1177/0309364618767138](https://doi.org/10.1177/0309364618767138)
47. Validity and Reliability Evaluation of Four Commercial Activity Trackers' Step Counting Performance.Tophøj et al., Telemedicine Journal and E-health, 2019. [doi.org/10.1089/tmj.2017.0264](https://doi.org/10.1089/tmj.2017.0264)
48. Validity of energy expenditure estimation methods during 10 days of military training.Siddall et al., Scandinavian Journal of Medicine & Science in Sports, 2019. [doi.org/10.1111/sms.13488](https://doi.org/10.1111/sms.13488)
49. Validity of the "Samsung Health" application to measure steps: A study with two different samsung smartphones.Beltrán-Carrillo et al., Journal of Sports Sciences, 2019. [doi.org/10.1080/02640414.2018.1527199](https://doi.org/10.1080/02640414.2018.1527199)
50. Accuracy of wearable physical activity trackers in people with Parkinson's disease.Lamont et al., Gait & Posture, 2018. [doi.org/10.1016/j.gaitpost.2018.04.034](https://doi.org/10.1016/j.gaitpost.2018.04.034)
51. Step count accuracy and reliability of two activity tracking devices in people after stroke.Schaffer et al., Physiotherapy Theory and Practice, 2018. [doi.org/10.1080/09593985.2017.1354412](https://doi.org/10.1080/09593985.2017.1354412)
52. The validity and reliability of consumer-grade activity trackers in older, community-dwelling adults: A systematic review.Straiton et al., Maturitas, 2018. [doi.org/10.1016/j.maturitas.2018.03.016](https://doi.org/10.1016/j.maturitas.2018.03.016)
53. Validity of Wearable Activity Monitors during Cycling and Resistance Exercise.Boudreaux et al., Medicine and Science in Sports and Exercise, 2018. [doi.org/10.1249/MSS.0000000000001471](https://doi.org/10.1249/MSS.0000000000001471)

## Version history

| Version | Date | Rating | Change |
| --- | --- | --- | --- |
| 1.0 | October 24, 2026 | Established | First published. |

Rating history on the research desk: Established (July 20, 2026).

## Cite this finding

KnowYourPrime Evidence Registry, Finding KYP-ER-0009, version 1.0, reviewed 2026-10-24. https://knowyourprime.com/evidence-wearable-heart-rate-accuracy

Machine-readable: [JSON](https://knowyourprime.com/evidence-wearable-heart-rate-accuracy.json) · [Markdown](https://knowyourprime.com/evidence-wearable-heart-rate-accuracy.md) · [All findings](https://knowyourprime.com/evidence)

## Related

- Research desk: [the activity research desk entry for this question](https://knowyourprime.com/research-desk-activity#device-motion-validity), with every scored study and its role
- Related finding: [Wearable Calorie and Energy Expenditure Accuracy](https://knowyourprime.com/evidence-wearable-calorie-accuracy) (KYP-ER-0010)
- Related finding: [Wearable HRV Accuracy Against ECG](https://knowyourprime.com/evidence-wearable-hrv-accuracy) (KYP-ER-0003)
- On this site: [Apple Watch vs Fitbit Heart Rate Accuracy in Arrhythmia](https://knowyourprime.com/apple-vs-fitbit-heart-rate-accuracy-arrhythmia)
- On this site: [Apple Watch Nails Resting Heart Rate, Misses on HRV](https://knowyourprime.com/apple-watch-hrv-resting-heart-rate-accuracy)

This is KnowYourPrime's own assessment of the published evidence, rated under the [KnowYourPrime evidence methodology](https://knowyourprime.com/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](mailto:corrections@knowyourprime.com).

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