How Accurate is Fitbit Workout?

Fitbit is a popular fitness tracker, but how accurate is it when it comes to workouts? We did the research to find out.


The accuracy of the measurement technology in fitness trackers, such as Fitbit, has grown substantially over the years. It is now able to track activities ranging from vigorous exercise to resting heart rate with a degree of accuracy on par with fitness equipment used by professional athletes and trainers. While fitness trackers can be used to gain valuable insights into one’s overall health and activity levels, there are certain factors that can affect their accuracy. In this article, we discuss common variables that may lead to inaccurate Fitbit workouts and how best to ensure accurate results.

We outline the effectiveness of the various sensors used in Fitbit devices and their ability to measure vital metrics such as steps taken and calories burned during a given workout session. We also explain potential errors which could adversely affect data accuracy, such as improper placement on the body or disconnection issues caused by poor Bluetooth connection. Finally, we provide an overview of best practices one should follow when using their device in order to ensure accurate readings.

How Accurate is Fitbit Workout?

Fitness trackers like Fitbit are popularly used by people who want to track their fitness levels. But how accurate is it when tracking your workout? This article will delve into the accuracy of Fitbit’s fitness tracking and explore what factors influence its accuracy. Read on to find out how precise Fitbit’s fitness tracking really is and what you can do to get the most out of your fitness tracker.

How Fitbit Tracks Workouts

Fitbits, like other activity tracking devices, rely on a number of sensors to accurately monitor your physical activities. The tracker employs an accelerometer to detect motion, identifying when you’re running, biking or swimming. This information is then used to determine the distance that you have traveled and the calorie burn associated with your activity.

Fitbits also feature a heart rate monitor that can offer further precision in estimating how many calories you’ve burned by measuring the intensity of your workout and monitoring your body’s response over time. This means that your workouts will be accurately tracked and logged for both duration and intensity so that you can gain insights into not just how long, but also how efficiently, you’re exercising – helping improve performance over time.

In addition to tracking physical activity, Fitbits can be worn while sleeping to measure heart rate variability as well as monitors activities such as steps taken throughout the day. This data is then converted into helpful metrics such as active minutes and calories burned throughout daily living as well as providing recommendations based upon amount of sleep received each evening.

Accuracy of Heart Rate Measurement

Accuracy of heart rate measurement is a feature that Fitbit boasts prominently and quite a few people use the device to measure their resting heart rate. Fitbits are said to be accurate enough to measure your basal metabolic rate (BMR) and get a baseline for your caloric burn.

When it comes to measuring heart rate, Fitbit does quite well, but it’s not perfect. In terms of absolute accuracy, research by the American Council on Exercise (ACE) found that the accuracy varies from model to model — with the Flex 2 performing best with 94 percent accuracy and the Alta HR performing worst with 93 percent accuracy. The bottom line is that all models generally perform very well when compared to an electrocardiograph, which is considered the gold standard for measuring heart rate.

Fitbit also includes SmartTrack technology which detects certain activities like running or biking when you are wearing your band or watch and records them automatically in its app—even tracking basic metabolic/heart rate data while you exercise. Studies have shown that SmartTrack was up to ninety-nine percent (99%) accurate at identifying aerobic exercises within a given duration interval while overestimating total caloric expenditure by twenty-two per cent (22%).

Overall, Fitbits generally provide accurate readings of your basic metabolic rate and this can give you an idea of how much energy you are using both during activities like running and even during sleep cycles. While studies have shown that these readings may not always be one hundred percent (100%) accurate, they do appear as effective as traditional methods at providing a baseline from which individual users can optimize their physical workout regimens.

Accuracy of Calorie Burn Measurement

Fitbit devices are designed to monitor and accurately measure your heart rate, steps, and calorie burn as you exercise. But how accurate is the calorie burn measurement?

Generally speaking, Fitbits tend to overestimate calorie burn on activities of moderate intensity or below. That means it may not be a precise reflection of the actual number of calories burned when you are doing lower intensity activity such as walking and jogging. This is because Fitbit can’t determine your exact level of workout effort and therefore can’t accurately measure your calorie burn for those activities. For example, during walking or jogging at a slow to moderate pace, a fitbit may overestimate the amount of energy used.

However, Fitbits are much more accurate when it comes to measuring strenuous activities like running and high-intensity interval training (HIIT). This is because HIIT workouts require intense bursts of energy and Fitbits can detect this type of movement which helps them give an accurate measure of the calories burned.

When measuring calories burned during the day with movements like walking, sitting or standing, fitness trackers generally give an estimate that is close to what would be considered normal for a given weight range based on factors such as age, height and activity level. These estimates may vary slightly due to individual differences in metabolism but should generally be within 10% accuracy if used correctly according to manufacturer guidelines.

Accuracy of Sleep Tracking

Fitbit devices track sleep stages using a combination of movement and heart-rate patterns. By analyzing these patterns, the device can tell when you are in light, deep and REM sleep. While most Fitbit models accurately detect when you fall asleep, they may not be as accurate at estimating the time spent in each stage of sleep. Most Fitbits use optical sensors to measure heart rate, which is usually accurate when measuring your instantaneous heart rate. However, since these sensors only measure your heart rate in short bursts during the night, they may overestimate light or REM sleep and underestimate deep sleep.

It’s important to remember that devices like Fitbit cannot diagnose or treat any sleeping disorders you may have; rather, they can provide reliable data that helps you get an idea of your overall sleeping patterns along with information on any potential problems you may encounter during the night. It is important to speak to a healthcare professional if you are experiencing frequent nights of interrupted or poor quality sleep as this could be a indication of an underlying medical condition that needs treatment.

Tips to Improve Accuracy

Wearables, like Fitbit, can be a great tool to track and monitor your workouts. However, like any other device, it is important to understand how to use it correctly to get the most accurate readings. Knowing some tips and tricks to improve the accuracy of your Fitbit can help you to get the best results from your workouts. Let’s take a closer look at how to get the most out of your Fitbit.

Wear the Tracker Properly

Wearing the Fitbit tracker the right way can ensure that you get accurate readings and make the most of your workouts. It’s important to wear it on your non-dominant arm, one to two finger widths away from your wrist bone, and keep it secure but not too tight.

You should also clean your wrist with a soft and dry cloth before putting on your tracker, which will help sweat and moisture not interfere with tracking accuracy. Additionally, avoid wearing lotions or materials next to the tracker such as metal jewelry or watches. Wearing them too close together can cause interference.

Whenever possible, wear the tracker for two hours or more per day in order for its algorithms to learn about you and better measure your activity levels. Keep in mind that Fitbit’s sensors are designed to track motion from 8-14 hours each day so it might take several days for tracking accuracy improvements to be seen if you newly start wearing it properly and consistently every day.

Use the Right Workout Mode

Using the right type of workout mode is essential for accuracy with your Fitbit. It’s important to check which workout mode is best for the exercise you’re doing and to accurately select that mode when you start the activity. Different modes use different algorithms for measuring the intensity of a workout, so it’s important to choose the right one so your calories burned are properly tracked. For example, if you’re going for a run, you would use outdoor run mode as opposed to cycling or treadmill modes. If you’re doing high-intensity interval training (HIIT), then using cardio boxing or another HIIT-specific mode will give you the most accurate info. Additionally, when using connected GPS or heart rate monitoring, it’s important that they are both properly paired with their respective apps in your device settings within the Fitbit app in order to ensure accuracy.

Track Your Workouts Manually

In addition to the calendar feature on Fitbit that helps you track your daily activity goals, you can also track your workouts manually. This ensures that all of your workout information is accurately recorded in your account. To do this, you’ll need to set up the exercise type and duration in the app, so it’s recommended that you plan ahead before starting any new workouts. You may also wish to log your weightlifting reps and sets or any other fitness information — all of which will add more details to your tracking accuracy.

Using an accurate log when tracking can have a number of benefits. Accurately documenting progress enables users to not only review activities more precisely, but also spot patterns that may lead towards a more successful long-term fitness journey — something many athletes are interested in pursuing. Accurate tracking can also help those comparing different types of exercises better assess the impact certain activities may have on their goals, such as increased calorie burn or muscle building potential.


When considering the accuracy of Fitbit workout tracking, it is important to remember that it is not a medical device and should not be relied upon in the same way. While it is capable of offering valuable insights into physical activity levels and related health metrics, the data provided by Fitbit should be treated as an estimate rather than an absolute measurement. If a more precise measurement of physical activity or fitness level is required, a medical professional or certified fitness trainer should be consulted.

Overall, Fitbit provides accurate workout tracking in many situations, but individual results may vary based on user technique and environment. In addition, specific measurements such as heart rate may not always be reliable and should not be used for diagnostic purposes. Ultimately, Fitbit offers users with helpful insights into their activity level, but due to its limitations it cannot replace professional monitoring.

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