I agree with Tessler, first make sure your settings and goals are aligned as much as possible on both sites. First is all the obvious profile setting stuff (height, weight, age, gender, time zone). Also:
*Make sure your current weight and goal weights are the same on both sites. Now, on fitbit choose your rate of loss (.5 pounds a week, 1 pound a week, 1.5 pounds a week or 2 pounds a week). Run that through the food plan set up. Now on the food plan summary page there is a date that fitbit predicts you will reach your goal if you lose at the planned rate. Enter that goal date number on your Spark account under the deadline for reaching goal weight. This should set your for the same rate of loss as fitbit. Hopefully your fitbit allowance will be somewhere in your Spark range?
*The other factor is your activity. Spark adjusts you plan by the calorie burn you enter in your weekly exercise calories goal. Fitbit adjusts it by your movement and any activity you log that day. Here is where it gets a little iffy. Ideally you could enter your typical weekly exercise calories after fitbit and spark have been linked for a week or so. The problem is, I believe these calories include your bmr for that time (which is already factored into your Spark allowance). For a one hour activity in a day, the bmr isn't adding much extra (in my case about 55 calories for an hour), but if you are doing well towards your activitity goals you may be adding a couple or more hours of bmr and over a week that adds up. Playing around with it, I just enter the typical weekly calorie burn minus 1000 calories. The other thing you could do is subtract one calorie per minute. for example using my last week's data. Spark pulled over 1145 minutes as exercise and credited me with 3568 exercise calories. If I subtracted one calorie per minute, I would actually be deducting a bit more than my bmr from the total (this will depend on your stats though, my bmr works out to be about 55 calories per hour). This might be about right or it might be a little high, look at your range. I prefer if my fitbit allowance on a sedentary day is at the low end of my Spark range. Then I can eat higher in the range on a very active day and at the bottom on a inactive day.
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