Fitbit’s former menstrual health feature is now called Cycle health in the Google Health app; the Fitbit app became the Google Health app beginning May 19, 2026. It lets you log periods and cycle details, view estimates and trends, and does not require a Fitbit device. Predictions are estimates—not ovulation measurements, contraception, or medical advice.
If you are using an older Fitbit app or account, labels and instructions may differ. Google’s current help documentation is the best place to check the latest setup and device instructions.
What Cycle health does
Cycle health is an app-based tracker for period dates and selected cycle details. It can show estimated period dates, a fertile window and ovulation day, and cycle trends. You enter your own information; the app does not establish ovulation or provide a clinical finding.
You can use Cycle health without a Fitbit device. Supported Fitbit devices and Pixel Watch models may provide supplementary access to cycle information after setup and after at least one period is logged. Cycle phases and symptoms are viewed in the app; check Google’s current compatibility instructions because supported models and navigation can change.
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How its estimates work
Google says estimates use the period and cycle-length information you provide, along with ovulation predictor kit (OPK) results you choose to log. If setup details are missing, the app starts with assumptions of a 28-day cycle and a 5-day period. Its displayed fertile window is 7 days. These are documented product settings, not claims about prediction accuracy.
Google says estimates become more personalized when you log periods consistently, and recent data matters. Trend summaries typically require at least three completed cycles. Several cycle metrics use the last six months of data: cycle-length and period-length trends are medians, while cycle variability is calculated from differences between consecutive cycles in that period. With fewer than three completed cycles, the app uses setup information for trend summaries.
| Item | What Google documents |
|---|---|
| Starting assumptions when setup details are missing | 28-day cycle and 5-day period |
| Displayed fertile window | 7 days |
| Typical minimum for trend summaries | 3 completed cycles |
| Data period for several cycle metrics | Last 6 months |
Source for the product settings and trend behavior in this table: Google Health Help Center, current help documentation accessed in 2026.
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How to track a period
- Open Cycle health in the Google Health app and follow the current setup instructions.
- Enter your period information and cycle details when prompted.
- Log each period consistently. Google’s instructions distinguish logging a period from recording flow details: flow details alone do not record a period.
- Optionally log OPK results if you use them. An OPK is not required to use Cycle health.
- Review estimates and trends as they appear, keeping in mind that they are based on entered information and may be inaccurate.
For exact navigation and supported device instructions, refer to Google’s current help pages; people using a legacy Fitbit app or account may see different steps.
What predictions mean—and what they do not
A predicted period date, fertile window, or ovulation day is an estimate based on available information. It is not proof that ovulation occurred, and Google does not guarantee particular results. Medical conditions and medications can affect cycles and feature accuracy; hormonal birth control may affect ovulation and make predictions less accurate.
Google states: “Cycle health tracking isn’t intended to be used for contraceptives or other medical purposes.” Do not use its fertile-window estimate as birth control, a diagnosis, or a substitute for clinical guidance. If you have concerns about your cycle, contact a qualified healthcare provider.
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Privacy and deleting cycle data
Google Health’s current instructions say you can delete today’s cycle data, all cycle health data, or data for a custom date range. The cited Fitbit data-collection information applies specifically to legacy Fitbit account users; it describes processing, collection, and storage of health and wellness information that may come from manual entry, a paired device, or connected third-party services. It should not be treated as a complete description of data handling for every current Google account.
Who may find Cycle health useful
Cycle health may be useful if you want a place to record periods, review estimates, or observe cycle trends over time. It works without a wearable, and consistent recent logging helps personalize estimates. Its documentation also allows users to record OPK results as an optional input.
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It is not a fertility decision tool or medical monitor. If you are trying to conceive, avoid pregnancy, or need help interpreting cycle changes, use qualified medical guidance rather than relying on the app’s estimates.
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FAQ
How do I track my period with Fitbit?
The current feature is called Cycle health in the Google Health app. Follow its setup instructions and log period dates there. Legacy Fitbit app users may see different labels or steps.
Does Fitbit predict ovulation?
Cycle health can display an estimated ovulation day and fertile window, using information such as logged periods, cycle length, and optional OPK results. These are estimates, not confirmation that ovulation occurred.
Can I use Fitbit period tracking without a watch?
Yes. Google says Cycle health works in the Google Health app without a Fitbit device. Supported Fitbit devices and Pixel Watch models can provide supplementary access after setup.
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Can I use my cycle health data for family planning?
Google says the feature supports learning about cycles and estimated fertile windows, but is not intended for contraception or other medical purposes. For conception or pregnancy questions, talk to a doctor.
Do I need an ovulation test kit to use Cycle health?
No. Google says you can log OPK results, but using Cycle health does not require a kit.
How can I delete my cycle data?
Google Health’s current instructions offer deletion for today’s cycle data, all cycle health data, or a custom date range.
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