How Do Fitness Trackers Measure Calories Burned?


When purchasing a fitness tracker that has a calorie burned indicator feature, you must ask yourself how would a fitness tracker calculate the amount of burned calories? If we are going to be real, the thought of it being just a smartwatch wrapped around your hand must have occurred to you, how does it function?

How Your Fitness Tracker Tracks Calories Burn?

Let us start from general knowledge first, our BMR short for “basal metabolic rate” is simply the rate at which you burn calories while you are resting just to maintain vital body functions such as: breathing, heartbeat, and brain activity.

Usually your BMR is estimated for at least half of the calories you burn in a day and it can be accounted based on the physical data you entered when purchase a fitness tracker then start creating a health profile which includes information such as: gender, age, height, and weight.

Based on your BMR calories, fitness trackers calculate the burned calories based on your heart rate, it is most likely the best and most reliable way of calculating.

So let’s say If you were very stressed during that meeting, and your heart rate was elevated, the chances of your calories burning abilities will be much higher than usual.

Moreover, a fitness tracker provides an in-depth estimation by taking into account not only the BMR as mentioned above, but also adds on the activities recorded by your tracker, in addition to any activities you might log manually.

The longer you wear your tracker the more accurate your resting rate, and the more accurate your resting rate is, the more accurate the calorie burn estimation will be.

There was a study made a while ago done by some doctors along with an experiment that was based on people testing out fitness trackers by wearing them then later debate any conflictions made between the results of the fitness trackers as devices and the results the doctor produced using professional and medical devices; the study assured how fitness trackers have very low errors in their estimation and their accuracy level is good, and how usually the device work by using the BMR method.

The BMR count in your  fitness tracker will reset itself every night at midnight thus you will be able to start a new day with a fresh negative counter that will begin counting immediately even if you have just gotten out of bed, and it is all thanks to how BMR burned calories work.

Although we should note that any fitness tracker can very much count your heart rates precisely but you can not rely on it for how much calories are burned, after all each body’s metabolism works differently as well as the BMR, it differs from one body to another.

At the end of the day, fitness trackers can not be accounted or relied on for an accurate amount of how much your body has burned calories. It is always best to keep up with a professional rather than a device.