Fitbit, one popular brand of fitness tracker, has faced criticism regarding the accuracy of its calorie burn estimates. While Fitbit uses similar methods as other fitness trackers to calculate calories burned, there have been reports of inconsistencies between predicted calorie burn and actual energy expenditure in some individuals. Factors like device placement or improper usage can affect the accuracy of Fitbit's calculations. However, it is worth noting that many users still find Fitbit's calorie burn estimates helpful for tracking their overall activity levels and progress towards their goals despite any potential inaccuracies.