However, based on the accuracy of other Fitbit models, it's safe to say that the Inspire 2 is likely to be accurate within a few percentage points. The accuracy of the Fitbit Inspire 2 calorie counter needs more testing. And the upgraded model, Fitbit Charge 5, is even more accurate than the Charge 4. A study conducted by Wareable found that the Charge 4 was highly accurate when it came to tracking heart rate and steps. Newer and more expensive Fitbit models tend to be more accurate than older and less expensive models.įor example, the Fitbit Charge 4 has been found to be one of the most accurate fitness trackers on the market.
Weight: As the Fitbit depends on your weight to calculate calories burned calorie burn, its estimate may be less accurate for people who fall outside a certain weight range.Įvery Fitbit model is slightly different, so the accuracy of the calorie burn counter will vary by model.If you're sedentary, it may underestimate your calorie burn. If you're very active, the Fitbit may overestimate your calorie burn. Activity level: The Fitbit calorie accuracy burn rate is most accurate when you're doing moderate to vigorous activity.In a Journal of Personal Medicine study, fitness trackers had the highest level of error when tracking walking. If you're doing a low-intensity activity, such as walking, the calorie burn estimate may also be affected. The intensity of activity: More intense activities can cause the Fitbit to overestimate energy expenditure, depending on where you wear it.This will ensure that the heart rate sensor gets a good reading. According to Fitbit, you should wear the tracker two to three fingers from your wrist bone. This can also lead to an inaccurate calorie burn estimate. If it's not positioned correctly, it may not be able to get an accurate heart rate reading. Wrist placement: The Fitbit is designed to be worn on the non-dominant wrist.This can lead to an inaccurate calorie burn estimates and tracking. Fitbit may not always be able to get an accurate heart rate reading for some people. Heart rate variability: Everyone's heart rate varies to some degree.People who use smart wearables tend to increase overall activity and steps count.There are a few factors that can affect the accuracy of the Fitbit calorie burn counter. In fact, some research suggests that smart wearables alone may introduce a positive impact on one's fitness life. Nevertheless, heart rate tracking and steps counting are features that are usually quite useful and dependable. The bottom line? Despite its limitations, such as the small sample size of devices and individuals, the research seems to be in line with previous ones suggesting that the commercially available smartwatches and wrist-worn fitness trackers don't provide reliable measurements of your daily energy expenditure. Steps count also seems to be on point for all of the devices involved in the research. Polar Vantage V and the Fitbit Sense wearables fluctuate depending on the exercise.
Watches calories counter series#
The good news is the Apple Watch Series 6 was pretty reliable in tracking heart rate across all activities. The research also seems to be in line with previous ones trying to assess the same capabilities but with different wrist-worn devices. It seems that the wearables are even more inconsistent with individuals that have lower-than-average and higher-than-average energy expenditure. That's because you can't reliably track progress even if absolute values are off.
Not only that, but the average deviation from the actual daily expenditure was unpredictable and wildly varying rendering the watches useless at tracking calories.
The guys at Stronger by Science summarized it into a simple table that evaluates the accuracy, variability and reliability of each device.Īs it turns out, all of the devices were pretty bad at tracking calories in almost all of the activities. Now, we won't bore you with the details of the study or the methods used as they seem solid enough and instead, we will talk about the findings. As reference devices, the team used the Polar H10 chest strap and the MetaMax 3B. The Apple Watch Series 6, Polar Vantage V and the Fitbit Sense were used by 30 healthy male and female participants engaging in weight training, cycling, running walking and even sitting.
In a paper published in January this year, researchers try to evaluate the usefulness of wrist-worn smart devices for tracking energy expenditure and heart rate.
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