How do Fitbit devices sync their data?

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This article explains how to save the data your device collects in your Fitbit account.

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What is syncing?

Syncing is the process that transfers the data your device collects to your Fitbit dashboard. The dashboard is where you can track your progress, see how you slept, set goals, log food and water, challenge friends, and much more. Fitbit trackers and watches use Bluetooth Low Energy (BLE) technology to sync with phones, tablets, and certain computers. Fitbit scales use Wi-Fi to connect directly to your router. The instructions in How do I set up my Fitbit device? explain how to make sure your device can sync to your Fitbit dashboard.

How do I sync my tracker or watch?

Data automatically syncs to the Fitbit app throughout the day. For best results, keep all-day sync turned on.

If you turn off all-day sync, we recommend syncing at least once a day. Each time you open the Fitbit app, your device syncs automatically when it's nearby. You can also use the Sync Now option in the app at any time.

For more information on how to sync Fitbit Ace or Fitbit Ace 2 with your phone or tablet, see How do I set up Fitbit kids devices?

How do I manually sync my tracker or watch?

To manually sync your device, with your device nearby, open the Fitbit app and find the picture of your device on the Fitbit app dashboard. Touch the picture of your Fitbit device at the top of the screen and pull down (on Windows 10 devices, find the picture at the bottom and pull up).

For more information about the Fitbit app and how to download it to your phone, tablet, or computer, see About the Fitbit app.

Choose your device to see syncing instructions.
  • iPhone or iPad
    1. From the Fitbit app dashboard, tap the Account icon (User-added image).
    2. Tap your device tile. 
    3. Tap Sync Now.
  • Android phone or tablet
    1. From the Fitbit app dashboard, tap the Account icon (User-added image).
    2. Tap your device tile.
    3. Tap the arrows next to Sync Now.
  • Windows 10 device
    1. From the Fitbit app dashboard, tap or click the Account icon (User-added image).
    2. Tap or click your device tile.
    3. Tap or click the sync icon.

    On Windows 10 computers with a USB port, you can automatically sync the devices in your household or other immediate space (about 20 feet):

    1. Plug in the dongle that came in the box with your device. 
    2. From the Fitbit app dashboard, click the Account icon (User-added image).
    3. Tap or click Advanced Settings.
    4. Turn on the option Fitbit Connect Classic Mode.

    All of the nearby Fitbit devices that are not connected by Bluetooth to another computer, phone, or tablet will sync automatically every 15-30 minutes. When you check your stats in the Fitbit app, you'll see your synced data, but you won't see real-time data. 

  • Mac or Windows 8.1 computers
    1. Click the icon with a Fitbit logo located near the date and time on your computer.
    2. Click Open Main Menu, and then click Sync Now. You may be asked to sign in, after which your device should sync with your account.

When does my scale sync?

After your Fitbit Aria or Fitbit Aria 2 is set up on your wireless network, it will automatically sync your stats to your Fitbit dashboard after every weigh-in.
User-added image

After you see your measurements, you should see a checkmark, indicating that syncing is complete. You can then view your data on your Fitbit dashboard.

Where can I see when my device last synced?

Find information about your Fitbit device, such as firmware version, and battery level and when your device last synced in your Fitbit dashboard:
From the Fitbit app dashboard, tap the Account icon (User-added image) > device tile. If you're using the dashboard, click the gear icon (User-added image). You'll see the last sync time right below the image of your Fitbit device.

Why can't I sync my device?

If your device stopped syncing, the likely problem is a connection issue. For detailed information on how to diagnose and solve the problem, see Why won't my Fitbit device sync? 

Will syncing work on my phone, tablet, or computer?

You can sync Fitbit trackers and watches using the Fitbit app. The Fitbit app is available for iOS, Android, and Windows 10 devices. For more information choose a section below.

  • Fitbit app for iOS

    The Fitbit app for iOS is compatible with most iPhones and iPads. To make sure your version is supported, check To learn more about using your Fitbit device with your iPhone or iPad, watch the following video. (English only.)

  • Fitbit app for Android

    Android phones must have both a BLE radio and software support. Because BLE is an optional component of Bluetooth 4.0, not all devices with Bluetooth 4.0 have it. A device can have the radio but not the software, or have software bugs that hamper BLE. If you're buying an Android device to use with the Fitbit app, make sure it appears on our supported devices list at and review known issues at What should I know about using the Fitbit app on my Android device?

    To learn more about using your device with your Android phone, watch the following video. (English only.)

  • Fitbit app for Windows 10

    The Fitbit app for Windows 10 is available for Windows 10 phones, tablets, and computers. To see if your device is compatible, see

    To learn more about using your device with Windows 10, watch the following video. (English only.)

How often should I sync my tracker or watch?

We recommend that you sync your tracker or watch daily. Most Fitbit devices record detailed minute-by-minute data for seven days. (Fitbit Alta records minute-by-minute data for five days). Fitbit devices can store daily totals for up to 30 days.

If you have a Fitbit Surge, your device can store 35 hours of GPS data before deleting some data to make room for more.

Can I sync my tracker or watch with more than one device?

You can sync your device with any compatible phone, tablet, or computer that meets syncing requirements. If you receive notifications from your phone on your Fitbit device, you'll need to disable the Bluetooth bond between your phone and Fitbit device before using a different phone. For instructions see Why won't my Fitbit device sync to another phone or computer?

Can I sync more than one Fitbit device to the same account?

If you have multiple devices, they can all sync to the same account to make sure your dashboard provides a complete view of your activity. For more information, see Can I use more than one Fitbit device with the same account?

Last updated: March 11, 2019
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