[header] How to determine your fat burning zone [title] Calculate your fat-burning zone with a formula. [step] There's a relatively simple formula to help you determine where your fat-burning zone falls. It's not 100% accurate, but will give you a relatively reliable range to aim for. 
[substeps] First, find your maximum heart rate (mhr). To do this, subtract your age from 220 if you're male; subtract your age from 226 if you're female.