Icon Zone Calculation Description
Out of
Zone
Below 50%
of your
maximum
heart rate
Your heart rate may be elevated, but not
enough to be considered exercise.
Fat Burn Between
50% and
69% of
your
maximum
heart rate
This is a low-to-medium intensity exercise
zone. This zone may be a good place to start
for those new to exercise. It's called the Fat
Burn zone because a higher percentage of
calories are burned from fat, but the total
calorie burn rate is lower.
Cardio Between
70% and
84% of
your
maximum
heart rate
This is a medium-to-high intensity exercise
zone. In this zone you're pushing yourself but
not straining. For most people this is the
exercise zone to target.
Peak Greater
than 85%
of your
maximum
heart rate
This is a high-intensity exercise zone. This zone
is for short intense sessions that improve
performance and speed.
Custom heart-rate zones
Configure a custom heart-rate zone or a custom max heart rate in the Fitbit app if
you have a specific target in mind. For example, elite athletes might have a target
that differs from the American Heart Association’s recommendations for most
people.
For more information, see help.fitbit.com.
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