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How accurate is my Flex?

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Fitbit is dedicated to developing the most accurate wrist-based activity trackers on the market. Our team has spent more than a year and performed multiple internal studies to rigorously test the accuracy of Flex. Through our testing, we have confirmed that Flex is one of the most accurate wireless tracking devices designed specifically for your wrist.

While accuracy counts, we believe tracking your health and fitness trends are what lead to big results. We want to make people more aware of their everyday activities and motivate them to do more. To that end, we feel you shouldn't worry if you miss a few steps or get a few extra steps here or there. What matters most is seeing your progress over time so you can achieve your health and fitness goals.

Why is my Flex step count different than my count on other Fitbit products?

Flex has been tested extensively against our clip-based devices like the Fitbit One and Fitbit Zip. That said, because Flex is specifically designed for your wrist, if you move your body a lot and not your arms (or vice versa), you may get a slight difference in activity than you would see on your clip-based trackers. Additionally, since you’re more likely to wear Flex 24/7, you may count a few more steps.

This is no different than any wrist-based tracker on the market. For most people, there may be no difference at all between clip and wrist based trackers or it may be within a few percentage points difference. That said, if you have a lifestyle where you move your hands a lot such as playing the drums everyday, you may see a few extra steps on your Flex as we do want to give you credit for this activity.

Why do I get extra steps sometimes?

Fitbit trackers have a finely tuned algorithm for step counting. The algorithm is designed to look for intensity and motion patterns that are most indicative of people walking and running.  When working at a desk, cooking, or doing other arm movements, the tracker can pick up some extra steps if it thinks you are walking. Many of these situations—such as working or cooking—do include steps in between stationary periods so the tracker tries to give you credit for those steps.

For the vast majority of customers, the amount of stray steps accumulated is negligible when compared to the entire day.

Will Flex count steps when I’m pushing a stroller or a shopping cart?

Flex will count your steps when you are pushing a stroller or a shopping cart as we do want to give you credit for this activity. That said, because your hands are not moving, your step count may be a bit lower during this activity.

Will my Flex pick up steps when I’m in the car or riding a vehicle somewhere?

Flex is a smart device that has been designed to not pick up your steps in these activities. It has been tested against driving, buses, trains, and other public transportation and should not give you extra steps when you’re traveling. That said, sometimes you’ll hit a bumpy road and may get a step or two. These should not make a big difference in your overall stats.

How can I make my Flex tracking more accurate?

You can improve the accuracy of your Flex by changing the Dominant Hand setting. To do so, log into your fitbit.com dashboard, click the gear icon in the top right, and go to Settings > Devices. Changing this setting to "Dominant" will decrease the sensitivity of step counting and should reduce any over counting of steps when your body is not moving. The "Non Dominant" setting will increase the sensitivity of step counting, and we recommend this setting if your Flex is not counting enough steps.

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Last updated: August 6, 2015
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