How does WHOOP calculate calories burned?

Here is how we calculate calories burned: 

  1. 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).
  2. 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 formula is proprietary and we have worked on matching academic literature on energy expenditure at different levels of effort.
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