MAF Calculator

Based on MAF Heart Rate Calculator. This calculator only works in Chrome or Firefox (not in IE).

Privacy Information: This calculator runs locally on your computer. None of your personal data is stored on our server.

Enter Your Numbers

a) Have or are you recovering from a major illness (heart disease, any operation or hospital stay, etc.) or are on any regular medication?
Illness - No
Illness - Yes
b) Are you injured, have regressed in training or competition, get more than two colds or bouts of flu per year, have allergies or asthma, or if you have been inconsistent or are just getting back into training?
Injured - No
Injured - Yes
c) Have you been training for more than two years without any of the problems in (a) and (b), and have made progress in competition without injury?
Trained 2 years - No
Trained 2 years - Yes
Scroll down for results after pressing Calculate


These are based on the Maffetone heart rate numbers.


Use this information at your own risk and with the advice of your medical professional. We are not doctors nor do we pretend to be one on the Internet. We do not take responsibility for errors in these calculations. We do not guarantee that these numbers will work for people at the extremes of the ranges. If you discover an error in calculation, please let us know through email: keto at land-boards dot com.