Track your period with Cycle Tracking

With iOS 13 and watchOS 6 or later, it's easy to track your menstrual cycle so you can get a better picture of your health.

You can track your menstrual cycle in the Health app on your iPhone or the Cycle Tracking app on your Apple Watch. And you can turn on notifications to tell you when your next period or fertile window is approaching.

The Cycle Tracking app is part of watchOS 6. watchOS 6 is compatible with Apple Watch Series 1 and later. Upgrading to watchOS 6 requires an iPhone 6s or later running iOS 13 or later.

Find out how the Health app is designed to protect your information

How to set up Cycle Tracking

  1. On your iPhone, open the Health app and tap the Browse tab. 
  2. Tap Cycle Tracking.
  3. Tap Get Started, then follow the onscreen steps. 

The Cycle Tracking app on your Apple Watch and the Health app on your iPhone 

How to track your cycle

  1. On your iPhone, open the Health app and tap the Browse tab.
  2. Tap Cycle Tracking.
  3. Swipe to the correct day, then tap the oval to log your period.
  4. To add more information, scroll down and tap a category, make a change, then tap Done. You can track symptoms, spotting, basal body temperature and more.

To track your cycle from your Apple Watch, open the Cycle Tracking app, swipe to the correct date, then tap the oval to log your period.

 

Add cycle factors

You can also add factors that can influence the timing and length of your cycle, such as pregnancy.

  1. On your iPhone, open the Health app and tap the Browse tab.
  2. Tap Cycle Tracking.
  3. Under the Cycle Log section, tap Set Up next to Factors.
  4. Select Pregnant, Lactating, Using Contraceptives or None of These.
  5. Enter a start date for the factor and tap Done.

If you’ve added a factor incorrectly, tap the factor and tap Delete Factor to remove it.

To end a factor, tap the factor and tap Ended. Enter an end date and tap Done. You can tap Show All Factors to see a history of your previous factors.

What the colours mean

When you open the Health app or Cycle Tracking app, it's easy to check your period or fertile window at a glance. Here's what the symbols and colours in the app mean.

Light blue oval

A light blue oval marks your predicted six-day fertile window.

Red stripes

Red stripes on a circle mark when your period is predicted to occur.

Solid red dot

Solid red circles mark your logged period days. 

Purple dot

Purple dots mark days when you logged information.

How to check the date for your next and last period

  1. On your iPhone, open the Health app and tap the Browse tab.
  2. Tap Cycle Tracking.
  3. Scroll to Predictions to see when your next period is likely to start. If you can't see the estimate, tap Show All next to Predictions.
    Cycle tracking statistics in the Health app
  4. Scroll to Summary to see the date of your last menstrual period and your typical cycle length.

To check the dates from your Apple Watch, open the Cycle Tracking app, then scroll down to Period Prediction or Last Menstrual Period. 

How to set period and fertility tracking notifications and prediction data

  1. On your iPhone, open the Health app and tap the Browse tab. 
  2. Tap Cycle Tracking.
  3. Scroll down and tap Options.
  4. Select Period Prediction and Period Notification. These notifications can let you know when your period is about to start and ask if your period has ended. 
  5. Select Fertility Prediction and Fertility Notification. These notifications can let you know when your fertile window is likely to start.

Predictions will begin after you've entered your last period in the Cycle Tracking app and are based on logged data. If you log a period before it's predicted to begin, you won't get a period prediction notification for that cycle. Notifications will appear on your Apple Watch and iPhone, depending on what device you're using. 

How predictions are calculated

Period predictions are based on data that you've logged about your previous periods and cycle length, including the number of days your period typically lasts and the length of your typical cycle. When you set up Cycle Tracking, you have the option to enter data about your cycle history — including the day your last period started, its typical length and the length of your typical cycle. You can enter this data manually or you can confirm data that was previously in the Health app from the use of third-party apps. Logging each day of your period helps improve prediction calculations.

The fertile window will be the six days you're most likely to be fertile, based on data that you’ve logged about your period or a positive ovulation test result. The fertile window prediction is based on a traditional calendar method. The fertile window is calculated by subtracting 13 days (the luteal phase) from the estimated next cycle start date. If you enter a positive ovulation test result, the fertile window prediction can adjust so that day five of the fertile window coincides with the first positive ovulation test result in a cycle.

 

About heart rate data and predictions

In addition to the information you’ve logged for previous periods and cycle length, Health can use heart rate data from your Apple Watch to improve your Cycle Tracking predictions.* Using heart rate data from Apple Watch to improve predictions is turned on by default but you can turn it off at any time.

  1. On your iPhone, open the Health app and tap the Browse tab. 
  2. Tap Cycle Tracking.
  3. Scroll down and tap Options.
  4. Turn off Heart Rate Data.

*The Heart Rate Data option is only available in certain countries or regions, and you must have an Apple Watch paired to an iPhone with iOS 15 or later. 

How to hide the Cycle Tracking app

You can remove apps directly from the Home screen of your Apple Watch:

  1. Press the Digital Crown to see the Home screen.
  2. Touch and hold the Cycle Tracking app until the app icon jiggles. If the app doesn't jiggle, make sure that you're not pressing too hard.
  3. Tap the delete button  , then tap Delete App. Not all built-in Apple apps can be removed.
  4. Press the Digital Crown to finish.

If your apps are in List View, swipe left on the Cycle Tracking app and tap the bin icon to remove it.

Learn how to install the Cycle Tracking app again.

About your health data and privacy

The information you add about yourself in the Health app is yours to use and share. You can decide what information is placed in the Health app as well as who can access your data.

When your phone is locked with a passcode, Touch ID or Face ID, all of your health and fitness data in the Health app, other than your Medical ID, is encrypted. Any health data synced to iCloud is encrypted both in transit and on our servers. And if you have a recent version of watchOS and iOS with the default two-factor authentication and a passcode, your health and activity data will be stored in a way that’s unreadable to Apple.

This means that when you use the Cycle Tracking feature and have enabled two-factor authentication, your health data synced to iCloud is encrypted end-to-end and Apple does not have the key to decrypt the data and therefore cannot read it.

Find out more about how the Health app is built to keep your data secure and protect your privacy

Things you should know

  • The Cycle Tracking app and predicted fertile windows should not be used as a form of birth control. 
  • Data from the Health and Cycle Tracking app should not be used to diagnose a health condition.
  • Third-party apps that work with the Health app can also be used with Cycle Tracking. 

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