Here is how we calculate calories burned:

- We first get an estimate of your Basal Metabolic Rate (BMR) using widely accepted formulas based on height, weight, and gender (note these are set in your profile information).
- As your Heart Rate rises, we also add to the BMR estimate an additional increasing function of heart rate. That is, for heart rates above a certain threshold the formula becomes Calories Burned = BMR + function(Heart Rate). This function formula is proprietary and we have worked on matching academic literature on energy expenditure at different levels of effort.

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