HIIT Heart Rate Interval Calculator

This calculator will aid you in monitoring your HIIT intervals by heart rate rather than time.

Enter your age and the calculator will output 2 numbers.

The first number is the MINIMUM heart rate you should reach during your high intensity intervals.

The second number is your optimal heart rate during your active rest intervals.

Please note you may not be able to get your heart rate as low as reccomended by this calculator during short intervals, or when just starting out.