As for me, I use fitday's "seated work" setting, which is around 2040 calories (the exact number varies a slight bit depending on my exact weight for that day). I've been keeping a chart of my daily calorie intake, number of calories burned through lifestyle and exercise, and the deficit. I then divide the total deficit by 3500 once a week (3500 being the number of calories which need to be burned to lose 1 pound of fat).
I thought my lifestyle calorie needs (the 2040 calories) was set too high because it seemed like I wasn't losing anything..though in each week there was a deficit (which never amounted to 3500 in one week though). But now I'm starting to see that the daily and weekly fluctuations made the chart seem wrong, because when I just added up the totals for each week, I was astounded to see that I was EXACTLY on point. I lost 4 pounds in 5 1/2 weeks (yes, very slow I agree!) and sure enough that's what the chart said.
A lot of people seem to have fitday set to "bedridden" to make the daily calories needed more accurate. Maybe because I live in NYC, where we walk a lot just to get to our daily appointments and to get to places such as the store or the subway to work (up and down all those subway stairs and then a few blocks to get to the subway and then walk from the station to work..UGH
).I'm starting to think you really CAN get this weightloss stuff down to an exact science.



). There is NO WAY to know for sure how many calories I burn during X activity. Heck, there's not even any way to know for sure that my 17 soy crisps have 160 calories like the package says because they are all just a little different in size, plus food manufacturers round the numbers on their labels--did they round up or round down? Who knows, but it could make a big difference if you're talking about something of which you eat multiple servings at a time.
Besides, the way most calulators and monitors work at determining how many calories you burn is based on a normal or "average" body composition when you enter your age and weight. At my weight, I'm pretty sure I have a much higher fat percentage than they'd like to use to calculate, so I assume pretty much every calulation is skewed to make me think I'm burning more than I really am.