My fitbit calorie burn on the fitbit site itself is fine and I actually have good results using it as my allowance. The allowance fitbit gives based on my loss goals, is quite similar to the lower to middle end of my Spark range. But this aspect is a little confusing with the way the two sites link.
Spark is pulling over all our fairly active and very active minutes from fitbit as exercise minutes. In terms of minutes, this works out fine for me because most of the minutes at this activity level are exercise in my case. There are some incidental activity like when I walk to run errands or jog in place during commercials, but I only see these activity levels when I am actually pretty active.
The main issue is with the calorie burn it credits as exercise. I am not sure, but I think it is just the total calorie burn during those minutes which does include our bmr so it is more than we would log if we were to log all of it as exercise. I found if I set my weekly goal about 1000 calories less than what it typically credits me for the week (not a precise number but I wanted to exclude my bmr for that time in the week and a little extra for non-exercise activity), my allowance seems fine. I just ignore the "burning too many calories message" that appears later in the week. Also, I made sure my spark weight loss goal deadline matched the date that fitbit predicts I will be at goal and that seems to help.
I like how spark pulls the activity minutes from fitbit. But figuring out how to work with the exercise calorie burn it gives is a little confusing.
| December Minutes: 580