Apple Watch 10 turned out to be the most accurate device for counting calories, according to a study 2026

Smartwatches are now everywhere today and more and more users are using them to track health and fitness metrics. But how accurate are these algorithms?

According to a recent study that focused on one of the main algorithms in smartwatches used to track calories, it shows that most smartwatches are wildly inaccurate. More specifically, MailOnline tested seven different devices from major manufacturers in a scientific experiment to see which one tracked the most accurate calorie count. The test was conducted in a laboratory in London, equipped with devices capable of measuring calorie consumption with very high precision.

Preparation included a basal metabolic rate measurement, a Dexa scan for body composition analysis, and then the test subject got on a stationary bike and measured their VO2 max via an oxygen mask and a medical heart rate monitor. These tests produced a value for calories burned that was about as accurate as possible and was then used to compare against seven brands of smartwatches.

According to the results, the higher percentage means the result is close to the laboratory measurement. The results are as follows: Decathlon CW500 S: 37%, WHOOP 5.0: 66%, Fitbit Charge 6: 72%, Samsung Galaxy Watch Ultra LTE (47mm): 78%, Oura Ring 4: 86%, Apple Watch Series 10: 92% and Garmin Vivoactive 6: 112%. The Apple Watch 10 is the closest to the lab result with a 92% match rate, followed by the Garmin Vivoactive 6 with 112%. However, there are large variations as these devices are based on much simpler sensors and data collection methods.

It is also worth noting that results may vary from person to person and this 92% accuracy is strictly related to the subject of the particular study. If you did the same experiment with the same Apple Watch 10 smartwatch, chances are the result would be completely different. Be that as it may, it seems that Apple's latest smartwatch is one of the most accurate devices for tracking the calorie consumption of its owner.

SOURCE

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