How do Fitbit devices sync their data?

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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, watches, and Fitbit Aria Air use Bluetooth Low Energy (BLE) technology to sync with phones, tablets, and certain computers. Fitbit Aria and Fitbit Aria 2 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 device with the Fitbit app?

Data automatically syncs to the Fitbit app throughout the 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 device with the Fitbit app?

  1. With your device nearby, open the Fitbit app to the Today tab .
  2. Press and hold on the screen and pull down (on Windows 10 devices, find the picture of your device at the bottom and pull up).
For more information about the Fitbit app see What’s the new Fitbit app experience?

Choose your device to see syncing instructions.
  • iPhones & iPads
    1. In the Fitbit app, tap the Today tab  > your profile picture > your device image. 
    2. Tap Sync Now.
  • Android phones
    1. In the Fitbit app, tap the Today tab  > your profile picture > your device image. 
    2. Tap the arrows next to Sync Now.
  • Windows 10 devices
    1. From the Fitbit app dashboard, tap the Account icon User-added image > your device image.
    2. Tap the sync icon.

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

    1. Plug in the dongle that came in the box with your device. 
    2. In the Fitbit app, tap the Today tab  > your profile picture.
    3. Tap Advanced Settings.
    4. Turn on the Fitbit Connect Classic Mode option.

    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.

  • Macs 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 > Sync Now. You may be asked to sign in.

When does my Fitbit scale sync?

After your Fitbit Aria or Fitbit Aria 2 is set up on your wireless network, it automatically syncs your stats to the Fitbit app 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 in the Fitbit app.

For Fitbit Aria Air, make sure you have the Fitbit app open on your nearby phone to sync your weight log.

Where can I see when my Fitbit device last synced?

Find information about your Fitbit device, such as firmware version, battery level, and when your device last synced:
  • Fitbit app

    Tap the Today tab  > your profile picture > your device image. 

  • dashboard

    On the dashboard, click the gear icon User-added image. The last time you synced is listed below the name of your Fitbit device.

Why can't I sync my Fitbit 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?

Sync Fitbit trackers and watches using the Fitbit app on iPhones, iPads, Android phones, and Windows 10 devices. 

  • iPhones & iPads

    The Fitbit app 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.)

  • Android phones

    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.)

  • Windows 10 devices

    The Fitbit app 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 Fitbit device?

We recommend that you sync your tracker or watch daily. Most Fitbit devices record detailed minute-by-minute data for 7 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 Fitbit device with more than one phone?

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 you see a complete view of your activity. For more information, see Can I use more than one Fitbit device with the same account?

Why was the all-day sync option removed from the Fitbit app?

To improve your experience with notifications, syncing, and firmware updates, we removed the option to turn off all-day sync from the Fitbit app. When your phone is near your Fitbit device with Bluetooth turned on, it periodically syncs with the Fitbit app to update your stats and download available firmware updates. More frequent syncing rarely, if ever, noticeably decreases your device’s battery life. To learn more about what factors affect battery life, see Can I extend my Fitbit device’s battery life?

Last updated: June 22, 2020
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