Charge 2 Calories Burned Accuracy? Compared to Calories In

[Jack12312]

I've been using my FitBit Charge 2 for approx. 1 year now, so I'd like to think it has a pretty good baseline. 

I'm curious of the accuracy of the calories burned section of the device. My average calories burned per day (taken from last week) is 3671. I am 24, 183cm, 77.4kg and 17% BF.

According to my Fitbit my BMR is 1824. 

I have an office job, so I'm pretty sedentary in the mornings, but I aim for 10K steps per day (which is frequently hit). I am in the gym 5 days a week weight training with some cardio (100 - 200 kcals burned per cardio session (tracked through fitbit) 2-3/5 days). 

I'd like to say i'm pretty active. The only issue is that my calories in comes nowhere near this 3600 mark. I'm currently on 2400 and my bodyweight has small fluctuations as normal, and my BF% is sitting around the 16-17% mark. It has been this way for a significant amount of time now (approx. 2 months). I attempted to raise my calories, but the weight gain was far too rapid with a significant BF increase also. 

In a time where I'm looking to gain some size, my Charge 2 is telling me that I need to consume in excess of 3800 calories per day, whereas the reality is that with my current composition, that would balloon me. 

Any help is greatly appreciated.

[AlvaroFitbit]

@Jack12312 It's great to see that you've visited the Fitbit Community! Thank you for your inquiry. Your account will calculate your caloric burn (and use this to calculate how many calories you can ingest based on your current goal) using your personal information (height, age, weight, etc.) and heart rate data. Still this is only an estimation. If you are seeing a difference on how your body is reacting to the calories you have consumed then please do consult a doctor (every health/weight plan should be accompanied by a doctor or health professional supervision). Also since you have taken the time to analyze how your body is responding you can take action to adapt your calorie consumption and avoid over eating in this bulking period.

Let me know how it goes!