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Smartwatches May Overestimate Calories Burned During Exercise

Researchers found typical smartwatch calorie errors of 15% to 25%, and accuracy fell as body fat increased.

Summary by News Medical
Smartwatches can significantly overestimate how many calories people burn during exercise, and their calorie estimates become less accurate as body fat increases, according to a new Florida International University study.

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Studies have been published showing that the smartwatch's exercise calorie measurements show a big difference from reality. Each product has errors of tens of calories or more, and in particular, it has been confirmed that the higher the body fat percentage, the greater the error. The researchers advise that smartwatch data should be used as an upper limit for reference rather than an absolute standard.

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Medical Xpress broke the news in Douglas, United Kingdom on Tuesday, September 1, 2026.
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