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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.
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.
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 maximum
heart rate.
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.
High-intensity
exercise zone. This
zone is for short
intense sessions
that improve
performance and
speed.
18


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