How Accurate Are Smartwatch Calorie-Burn Estimates? (August 2026)

How Accurate Are Smartwatch Calorie-Burn Estimates

How accurate are smartwatch calorie-burn estimates? After reviewing peer-reviewed research and testing across multiple brands, I’ve found the typical accuracy range is 18-40%, meaning your device can be off by hundreds of calories per day. In this guide, I’ll walk you through exactly how your watch calculates energy expenditure, what the studies actually say about … Read more