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Check your heart rate
Heart-rate zones help you target the training intensity of your choice. FB504 & FB505 shows your current
zone and progress toward your maximum heart rate next to your heart-rate reading. On your Fitbit
dashboard, you can see your time spent in zones during a particular day or exercise. Three zones based on
American Heart Association recommendations are available by default, or you can create a custom zone if
you have a specific heart rate you’re targeting.
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
FPO
Out of Zone Below 50% of your
maximum heart rate.
Your heart rate may be
elevated but not enough
to be considered
exercise.
FPO
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.
FPO
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.
FPO
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.
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