In the same study, the researchers wanted to compare the accuracy of the Fitbit Charge 2 to cheaper Fitbit trackers on the market. This is incredibly far off from the real results. Most models overestimated the number of calories burned by more than 50%. In contrast, the Fitbit Charge 2 is way less accurate when it comes to measuring the number of calories burned while walking. The Fitbit underestimated the calorie burn by just 4%, which is impressive. In their studies, they found that the tracker was incredibly accurate when measuring calories burned while running. In a study conducted by researchers at Aberystwyth University, the researchers wanted to know exactly how accurate the Fitbit Charge 2 was. One of the most popular Fitbit models is the Fitbit Charge 2. Other times, Fitbits can underestimate the number of calories burned. Final Thoughts Is Fitbit Calories Burned Accurate?Īll fitness trackers, including Fitbit, tend to overestimate how many calories are burned per day.Should You Still Use A Fitness Tracker?.How Does Fitbit Compare To Other Brands?.How Does Fitbit Track Calories Burned?.Are Some Models More Accurate Than Others?.