Calories earned/burned

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hey MFP experts, how does the calories earned number get calculated? Some days, I'll have 10,000 plus steps and get 500 calories but today i have 5600 steps and over 2000 calories. I have a Fitbit charge HR. does the greater amount of information from the heart rate function improve the accuracy of the calories earned/burned numbers? Any info about this would be much appreciated!!

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