Smartwatches Overestimate Calorie Burn by About a Quarter, Study Finds
TL;DR
A National Science Foundation–funded study tested Apple, Garmin, Samsung and Fitbit smartwatches on 58 participants while researchers used precise metabolic measurements, finding that wearables overestimate calories burned by roughly 15–25 percent—meaning these devices can exaggerate energy expenditure and should be treated with caution for weight management.
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