The rule of nines is a tool used to estimate a burn's percentage of your total skin. It divides your body into sections by multiples of 9% each. Parts of the Rule of Nines.

In other words, while you can get a rough estimate of how many calories you burn over a given distance or time, remember that these are just estimates. Related Story.

Without power or heart-rate measurement, you can estimate how many calories you burn while cycling using an online calorie calculator. Most of these calorie calculators use MET units, ...

QUICK ANSWER. The Apple Watch calculates your daily calories burn using your height, weight, age, gender, heart rate, and movement. Of course, the results are an estimation, but generally, they ...