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Default heart-rate zones
Default heart-rate zones are calculated using your estimated maximum heart rate.
Fitbit calculates your maximum heart rate with the common formula of 220 minus
your age.
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Custom heart-rate zones
Set 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.
Zone
Calculation
Out of
Below 50%
Zone
of your
maximum
heart rate
Fat Burn
Between
50% and
69% of your
maximum
heart rate
Cardio
Between
70% and
84% of your
maximum
heart rate
Peak
Greater than
85% of your
maximum
heart rate
Description
Your heart rate may be elevated, but not
enough to be considered exercise.
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.
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.
This is a high-intensity exercise zone. This
zone is for short intense sessions that
improve performance and speed.
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