The miminum input in this calculator is your age OR your maximum heart rate. You don't need to fill in all the fields 🙂.
Age
yrs
Resting heart rate
bpm
Maximum heart rate
bpm
Heart rate reserve
bpm

The fat burning zone calculator estimates your target heart rate for the greatest amount of fat loss (oxidation). Keeping your heart rate in those values will allow you to maximize your body's ability to lose weight and burn fat while exercising.

Do you want to know how many calories you burn during training? Check our calories burned calculator!

Target heart rate

Your heart rate is one of the best indicators of how hard your body is working when exercising. Target heart rate is the desired range your heart rate should be in during the performance of a physical activity, which enables your heart and lungs to receive the greatest benefit they can from the workout.

This theoretical range varies among people, and depends mostly on age; however other factors, such us physical condition, sex, and previous training, also may have an influence.

Fat burning heart rate

You might have seen the "fat burning zone" written on treadmills, cycle ergometers, ellipses and other equipment. Have you ever wondered where does comes from? Well, we have the answer for you! The fat burning zone is simply the range of heart rates that is ideal for fat loss. It can be calculated as a 60-80% of your maximal heart rate.

If you want to find out more about other heart rate zones, check out the target heart rate calculator.

Fat burning zone calculator

Fat burning zone calculator estimates your target heart rate for weight loss using 3 different methods:

  1. 60-80% of your maximum heart rate

  2. Zoladz method, which defines exercise zones by subtracting values from your maximum heart rate (MHR):

    THR = HRmax − Adjuster ± 5 bpm,

    where the adjusters for the fat burning zone are equal to 40 and 50.

  3. Karvonen method, where you need to know your resting heart rate (RHR) to calculate your target heart rate, using a range of 60–80% for the intensity:

    THR = ((MHR − RHR) × % intensity) + RHR

where MHR-RHR can be also defined as a heart rate reserve.

How to calculate fat burning zone? - an example

Let's try to calculate the fat burning heart rate range for a person that is 35 years old with a resting heart rate of 60.

  1. We need to calculate their maximum heart rate first, where:

MHR = 220 - age

MHR = 220 - 35

MHR = 185

  1. We can now calculate the fat burning heart rate zones using 3 different methods:
  • 60-80% of maximum heart rate:

fat burning zone: [60% x 185] - [80% x 185]

fat burning zone: 111 - 148 BPM*

  • Zoladz method:

fat burning heart rate: [185 - 50 ± 5] - [185 - 40 ± 5]

fat burning heart rate: 130 - 150 BMP

  • Karvonen method:

fat burning zone: [((185 − 60) × 60%) + 60] - [((185 − 60) × 80%) + 60]

fat burning zone: [125 x 60% + 60] - [125 x 80% + 60]

fat burning zone: 135 - 160 BPM

*BPM - beats per minute

Seems complicated? Not with our fat burning zone calculator, which allows you to obtain your results in just a few seconds!

Heart rate for weight loss

You have found out how to calculate fat burning zone, but do you really need to lose weight? Check our BMI or ideal weight calculators to find it out.

Even if you do not need to change your weight, remember that physical activity is really important, as it helps us to maintain both our physical and mental health, and can prevent us from contracting such diseases as diabetes and cardiovascular disease.

If you are not sure if you meet your daily recommendations for physical activity, check our MET minutes calculator. And last but not least - remember about a healthy diet!

Joanna Michałowska, PhD candidate