Your watch turns heart beats into calories using a chain of guesses: heart rate to oxygen to calories. It is an indirect estimate, not a real measurement, which is why Burnie does not use heart rate at all.
13 Jul 2026 · Burnie Academy
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Your fitness watch shows a calorie number after a workout. It looks like a fact. But your watch cannot actually count calories. It only counts heart beats. Then it turns those beats into calories using a chain of maths and guesses. This article explains that chain in plain words, so you can see why the number is only an estimate.
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