Short answer: Apple Watch calorie readings are estimates, not laboratory measurements. The separate calculator below gives an illustrative activity-calorie range from workout type, body weight, and duration. It also asks for age, sex, and height to show optional resting-energy context, because Apple says that personal details help calculate calorie metrics. It does not read your Apple Watch, reproduce Apple's private calculation, or guarantee the number that the Workout or Fitness app will display.
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