Track your heart rate continuously and automatically with your Fitbit device.
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How does my Fitbit device detect my heart rate?
What are heart-rate zones?
What is resting heart rate?
How is resting heart rate measured?
What is max heart rate?
What factors impact my heart rate?
How do I improve the accuracy of my heart-rate reading?
What is my cardio fitness score in the Fitbit app?
How do I turn off heart-rate tracking on my Fitbit device?
Are the LEDs on my Fitbit device safe?
Why don't I see my heart rate on my Fitbit device?
How does my Fitbit device detect my heart rate?
When your heart beats, your capillaries expand and contract based on blood volume changes.
PurePulse LEDs (light-emitting diodes) on your Fitbit device reflect onto the skin to detect blood
volume changes, and finely-tuned algorithms are applied to measure heart rate automatically and
continuously. The heart-rate icon you see on the display tells you if you're in 1 of 3 heart-rate
zones.
What are heart-rate zones?
Heart-rate zones can help you optimize your workout by targeting different training intensities.
Fitbit calculates your maximum heart rate with the common formula of 220 minus your age.
Three heart-rate zones are determined using your estimated maximum heart rate. The
illustrations below provide examples for each zone.
Note that the icons may look slightly different between devices; for example, dots instead of
dashes. For more information about zones, see the American Heart Association's Target Heart
Rates article.
Peak zone
Peak zone means your heart rate is greater than 85% of its maximum. This high-intensity exercise zone is
for short, intense sessions that improve performance and speed.
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