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Fitbit is a health and activity-tracking brand known for wearable devices that measure steps, heart rate, sleep, workouts, and other wellness signals. While Fitbit began as a simple step-counter, its modern devices and app have expanded into broader health features—like irregular rhythm notifications, ECG (on supported devices), sleep tracking, and personalized fitness insights.
Since Google acquired Fitbit, the product strategy has increasingly connected Fitbit hardware and services into Google’s broader wearables ecosystem. That includes account changes (moving Fitbit accounts to Google accounts), deeper Pixel Watch integrations, and continued emphasis on health features backed by large-scale studies.
Answer box: Fitbit reported 28M+ active users and 116M+ devices purchased as of October 2020. As of June 2022, Fitbit said 2M+ people enrolled in its AFib detection feature (Irregular Heart Rhythm Notifications). Google completed its $2.1B acquisition of Fitbit on January 14, 2021, and the deadline to migrate Fitbit accounts to Google accounts is February 2, 2026.
Fitbit Key Metrics (Latest Available)
| Metric | Figure (with year) | Source |
|---|---|---|
| Active users | 28M+ active users (as of Oct 2020) | Fitbit (Google) Enterprise blog |
| Devices purchased / sold (all time) | 116M+ devices purchased (as of Oct 2020) | Fitbit (Google) Enterprise blog |
| AFib feature enrollment | 2M+ enrolled (Jun 2022) | 9to5Google (citing Fitbit) |
| Monthly users (clinical-context estimate) | ~37M monthly users (as of 2022) | American College of Cardiology (May 2024) |
| Acquisition (Google → Fitbit) | $2.1B deal completed Jan 14, 2021 | Google Devices & Services blog |
| Account migration deadline | Must migrate to Google account by Feb 2, 2026 | The Verge (Mar 2025) |
What Fitbit Does
Fitbit devices and the Fitbit app focus on everyday health signals—helping users build habits, understand trends, and track progress over time. Depending on the device, Fitbit can track:
- Activity: steps, workouts, distance, floors, and active minutes
- Heart health: heart rate trends and irregular rhythm notifications (AFib feature on supported devices)
- Sleep: sleep duration and sleep stage estimates
- Wellness insights: dashboards and trend summaries in the Fitbit app
AFib Detection: A Major “Health” Milestone
One of Fitbit’s most widely discussed medical-adjacent features is Irregular Heart Rhythm Notifications, which monitors for patterns that may be consistent with atrial fibrillation (AFib). Fitbit told 9to5Google that over 2 million people enrolled in the feature as of June 2022.
Source: 9to5Google (Jun 16, 2022)
Google Ownership and the 2026 Account Deadline
Google completed its acquisition of Fitbit on January 14, 2021. Since then, Google has been moving Fitbit accounts toward Google accounts. The Verge reports the migration deadline is now February 2, 2026; users who don’t migrate by then may lose access to Fitbit services and stored data unless they download it beforehand.
Google acquisition announcement (Jan 14, 2021)
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Migration deadline reporting (The Verge)
Fitbit “By the Numbers” (Historical Milestones)
- Devices sold: 60M (2017) — Fitbit 10th Anniversary
- Steps tracked (all time at the time): 73.7T steps (2017) — Fitbit 10th Anniversary
- Nights of sleep tracked (cumulative at the time): 3B nights (2017) — Fitbit 10th Anniversary
- Total steps taken by Fitbit users: 45T steps (2017) — Fitbit Year in Review
- Total steps taken by Fitbit users: 46T steps (2021) — Fitbit 2021 Year in Review
FAQ
How many active users does Fitbit have?
Fitbit reported 28M+ active users as of October 2020. Fitbit does not consistently publish a frequently updated global active-user figure, so newer “usage” discussions often rely on specific statements in Google/Fitbit materials or reputable third-party/clinical-context sources.
Source: Fitbit (Google) Enterprise blog
How many people enrolled in Fitbit’s AFib detection?
Fitbit told 9to5Google that over 2 million people enrolled to receive irregular heart rhythm notifications as of June 2022.
Source: 9to5Google (Jun 16, 2022)
How many Fitbit devices have been sold?
Fitbit stated that as of October 2020, people had purchased 116M+ Fitbit devices. Earlier, Fitbit reported 60M devices sold as of its 2017 10th anniversary post.
Source: Fitbit (Google) Enterprise blog (Oct 2020)
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Source: Fitbit blog (2017)
When did Google buy Fitbit, and for how much?
Google completed the Fitbit acquisition on January 14, 2021. The deal was widely reported as a $2.1B acquisition.
Do Fitbit users have to migrate to a Google account?
Yes. The Verge reports the deadline to migrate Fitbit accounts to a Google account is February 2, 2026.
How many monthly users does Fitbit have?
Fitbit does not publish a single frequently updated, official monthly-user number in the same way many social apps do. However, an American College of Cardiology explainer cited Fitbit at ~37M monthly users (2022) in a clinical discussion of wearables and AFib detection.
