how do smart watches and fitness tracker measure the calories you burnt throughout the day/exercise?

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They might tell you, you burnt 2000kcal today or 300kcal during this sport training. But how do they get these numbers?
And afaik studies showed that they are incorrectly measured. How do the experts check that the data is correct? I mean you need the real numbers but for that you used the smart watch (or similar device).

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Anonymous 0 Comments

I think the second part of your question is “how do experts accurately measure calorie expenditures” and the answer is that they hook up something that captures your breathing in and out and calculate how much CO2 you’re producing. A good answer is the tl;dr answer in this thread

[https://www.reddit.com/r/askscience/comments/rbo8b/how_do_scientist_measure_how_many_calories_are/](https://www.reddit.com/r/askscience/comments/rbo8b/how_do_scientist_measure_how_many_calories_are/)

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