About Fitbit Surge

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Get to know your Fitbit Surge. Choose a shortcut to see the answer below:

What sizes does Surge come in?

Fitbit Surge™ is available in small, large, and extra large.
  • The small fits a wrist between 5.5 and 6.7 inches in circumference (or 140 - 170 mm).
  • The large fits a wrist between 6.3 and 7.9 inches in circumference (or 161 - 200 mm).
  • The extra-large fits a wrist between 7.8 and 9.1 inches in circumference (or 198-230 mm). 

What does Surge track?

Regardless of the activity, Fitbit Surge tracks steps, heart rate, distance, calories burned, floors climbed, and simplified heart rate zones. 

How does Surge track my exercise?

Fitbit Surge has two ways to track specific exercises. You can tell your tracker when an exercise starts and stops in order to see real-time stats and a workout summary on your wrist. This method, known as exercise mode, also provides GPS. You can also let your Surge automatically detect exercise with the SmartTrack™ feature. For more information, see How do I track my exercise and activities with Fitbit?

How do I change the clock face? 

Surge offers several designs for the clock screen. To see your options, open the Fitbit app and tap or click the Account icon (User-added image> Surge > Clock Face. If you change the clock face, sync your tracker to see the change.

Is the Fitbit app compatible with my mobile device?

The Fitbit app is compatible with select iOS, Android, and Windows Phone devices. For a full list, see We're continually improving our device compatibility so if you don't see your device on the list check back soon.

What is Surge made of?

The Surge wristband is a flexible, durable elastomer material similar to that used in many sports watches. It does not contain latex. The buckle is made of surgical-grade stainless steel. While all stainless steel contains nickel and may cause an allergic reaction in someone with nickel sensitivity, the amount of nickel in all Fitbit products meets the European Union's stringent Nickel Directive.

See our Wear and Care page for cleaning instructions and care tips.

How does Surge track my heart rate?

When your heart beats, your capillaries expand and contract based on blood volume changes. PurePulse™ LED lights on your Surge reflect onto the skin to detect blood volume changes and finely tuned algorithms are applied to measure heart rate automatically and continuously. The heart rate icon you see on the display tells you if you're in one of three heart rate zones. For more information about heart rate and heart rate zones, see What should I know about my heart rate data?

How does Surge track my sleep?

The motion sensor on your Surge analyzes your movement patterns to determine whether you're asleep, restless, or awake. We use this data to calculate your sleep efficiency. You don’t need to press any buttons or otherwise enter a “sleep mode” to begin tracking sleep. Simply wear your Surge to bed.

What is a silent alarm?

The silent alarm uses vibration to gently awake or alert you at the time specified. You can set up to eight silent alarms from a computer or from a compatible mobile device. Silent alarms can be configured to recur on multiple days of the week (for example 8:00 AM, Monday-Friday).

How does Surge track my steps?

Fitbit trackers use a 3-axis accelerometer to understand your motions. By analyzing acceleration data, our trackers provide detailed information about frequency, duration, intensity, and patterns of movement to determine your steps taken, distance traveled, calories burned, and sleep quality. For more information see How does my tracker count steps?

How does Surge track my floors?

To count floors your Surge uses an altimeter, which is sensor that calculates altitude based on atmospheric pressure. Surge registers a floor when it detects continuous steps combined with an elevation gain of about 10 feet. For more information see How does my tracker count floors?

How does my data get from Surge to the website?

Your Surge will automatically sync every 15 minutes whenever there is new data to upload and your Surge is within range of a compatible mobile device or the wireless sync dongle plugged into your computer.

How long does the battery last?

If you aren’t tracking runs or exercises that use GPS, your fully charged Surge should last up to 7 days before needing a charge. A fully charged Surge can track up to 10 hours of activities that use GPS.

Can I share my Fitbit data through Twitter and Facebook?

Fitbit can share your daily or weekly averages to Twitter. You can also connect with Facebook friends on Fitbit to share data and compete against one another.
Last updated: November 21, 2017
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