How is calories measured
How is calories measured in the fitness app
iPhone 8 Plus, iOS 12
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Most fitness apps use an algorithm including parameters such as your weight (for walking/running activities), your heart rate, and the time taken for of the activity. Your age may also be taken into account. So you and your partner on the same run may have different calorie results.
Generally it is an estimate of the calories in addition to those used up just by living which can be 2000 a day just by lying down.