Heart Rate

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Unlock the power of PurePulse® heart rate
See how our first automatic, continuous wrist-based heart rate technology is helping you understand your heart on a new level.
Discover the benefits of heart rate tracking
Know your zoneUse heart rate zones to maintain the right intensity.
Track sleep qualityUse your heart rate to track sleep stages.
Reach weight goalsGet a more accurate measure of calories burned.
Manage stressDo guided breathing sessions personalized for your heart rate.
Heart rate tracking made for every dayHeart rate tracking made for every day
In the past, heart rate tracking was expensive, awkward and uncomfortable. With the invention of PurePulse, we made it accessible to anyone. Inspired by a thimble-sized sensor used in hospitals, we conducted extensive research to make wrist-based heart rate tracking work in all types of environments.
Photoplethysmography: a long word with a short explanationPhotoplethysmography: a long word with a short explanation
We use light to measure blood flow. As your heart beats, the volume of blood in your wrist rises and falls. Blood absorbs light, so a sensor shines a light onto the skin while light detectors called photodiodes measure how much light is being absorbed. The rise and fall of the absorption signal represents each heartbeat. This tells you how many times your heart is beating per minute.
Innovation backed by researchInnovation backed by research
In a number of external studies worldwide, PurePulse® technology has surpassed industry expectations. And over 50 patents related to PurePulse technology have been awarded to Fitbit’s heart rate innovation in the process.
Features and tools powered by heart rate
Man sleeping with his watch on
Resting Heart RateMeasure heart rate when your body’s at rest to assess your heart health and see resting heart rate trends.
Charge 6 screen with Heart Rate zones displayed
Heart Rate ZonesUse real-time heart rate zones to understand your effort during workouts.
Women on a workout bike
Cardio Fitness LevelBetter understand how fit you are without the need for a strenuous VO2 max test.
Watch displaying guided breathing
Guided BreathingRelax anywhere with personalized breathing sessions based on your heart rate.
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Fitbit launched the first automatic, continuous wrist-based heart rate technology in 2014 with PurePulse®.