Fitbit Active Zone Minutes: A definitive guide

Fitbit Active Zone Minutes is a brand new Fitness goal introduced by Fitbit based on the World Health Organization and the American Heart Rate Association’s recommendations for adult health.

Fitbit Active Zone Minutes Ultimate Guide

It is first introduced in Fitbit Charge 4 devices by replacing Active Minutes and not this feature is available all latest Fitbit Smartwathes and Fitness Trackers. As per, this feature will soon be available in Fitbit’s smartwatches as well, such as Fitbit Ionic and Fitbit Versa Series. 

What is Fitbit Active Zone Minutes?

World Health Organization(WHO), American Heart Association(AHA), and other health organizations recommend that an adult should do at least 150 minutes of moderate aerobic exercise or 75 minutes of vigorous-intensity exercise in a week for a healthy (heart) life. 

With this goal, Fitbit is exactly helping its users to achieve WHO and AHA recommended weekly goals scientifically and systematically. 

So Active Zone Minutes is a new concept developed by Fitbit to measure the heart pumping capacity of its users by assessing the time spent on each activity zones. 

In simple words, it is directly related to the time spent on each active zones.

How Fitbit Calculates Active Zone Minutes?

Fitbit uses four different heart rate zones to calculate active heart rate points. The heart rate zones are as follows,

Resting heart rate zone

This is the basic reading to calculate the other three heart rate zones. This basic heart rate zone varies from person to person. 

With PurePulse heart rate tracking, Fitbit automatically calculates resting heart rate zone based on a person’s age and cardiovascular health. So the resting heart rate zone also varies as the person ages.  

The Fat Burn, Cardio, and Peek are the other three zones Fitbit used to calculate heart rate zone minutes.

Heart Rate ZoneCalcualtionActive Zone MinutesExercises
Fat BurnResting HR+40% Heart Rate Reserve1Brisk Walking, Dancing, Gardening, etc.
CardioResting HR+ 60% Heart Rate Reserve2Cycling, hiking, etc
PeakResting Heart Rate+ 85% Heart Rate Reserve2Montain climping, cycling, running with weight, etc.

You will be awarded one Active Zone Minutes for Fat Burn Zone and you will get two active minutes for reaching Cardio and Peek Zones.

For example, if you want to achieve the Word Health Organization recommended 150 active minutes, then you have to earn 30 active zone credits per day.

Fitbit Active Zone Minute Calculation

In addition to that, you will get credited additional Active Heart Rate(AHR) zones whenever you touch fat burn, cardio, or peek heart rate zones during the day to day activities. 

Even five minutes of activity, you can earn one or two active zone credits based on your activity zone. 

It is a huge advantage of the AHR zone over Active Minutes. 

Because you will not earn any active minutes for the first 10 minutes of any activity as a wearable device consider it as a warm-up period. 

To explain this brabd new metrics further, I will give you one more example. 

I had heard people saying that yesterday when I walked for 30 minutes, I did not get any active zone minutes. On the other hand, when I walked 15 minutes today, I earned 25 active minutes.

This simply because your zone active minutes are directly related to activity intensity. If you work out harder, you will get more points. The same way you will get 2X points if you touch Cardio Zones or Peek Zone.

Fitbit Active Zone Minutes

So we can say that a more intensive workout means more active zone minutes. 

In the above example, she or he may walk at a slower pace so the heart rate might remain within the resting heart rate zone. So the Fitbit will not award you any points here. 

However, on the same day, she or he might have walked at a faster pace and might have reached Fat burn Zone and then Cardio Zone or Peak Zone to get a total of 25 zone minutes.

How to Count Active Zone Minutes with Fitbit Charge 4?

Fitbit Charge 4 Features

Fitbit Charge 4 is the only Fitbit that tracks and calculated active zone minutes currently. Before you start your workout just turn on workout mode at your Fitbit Charge 4 device. 

Now the Fitbit will accurately track your heart rate and give you a vibration when you move from one zone to another zone.

This way Fitbit, continuously motivates you by displaying a progress bar on your weekly active minute goals. This helps encourages you to work harder to achieve your active zone credits.

The default active zone minutes in Fitbit Charge 4 is 22 minutes. As you know, it is very low, and it does not take more than 20 minutes to achieve this goal.

But any time you can increase or decrease default active zone target minutes goal in Fitbit by just adjusting a sliding bar in the settings. 


In a nutshell, Active Zone credits directly related to your workout intensity, and it is not associated with the duration of an activity. 

Also, you do not need to work out a long time to achieve WHO or AHA recommended heart rate goals every week. Thirty minutes of work out per day is enough to hit the weekly target. 

I think this article on Fitbit Active Zone Minutes was helpful for you in understanding and achieving your Active Zone Minute target efficiently.

Saneesh VS is a Registred Nurse By Profession and Wearable Tech Enthusiast by Passion.

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