Hi toastermm. FitDay uses a standard forumla to estimate your calorie burn. It has to do with gender, weight, etc. The 3200 calorie number is not your sit around all day number. It is a number that takes into account the lifestyle you selected in your Profile. So, it you choose a different lifestyle in your Profile tab this number would change.
We do try to use the best known estimates, but these are just estimates and can be off depending on a bunch of factors. If you think you know your burn rate, you can absolutely customize this in FitDay. Go to your "Activities" page and there is a "Customize" link next to the Lifestyle value. Click on this and you can set your own metabolic rate or choose a different estimation technique.
I hope this help and good luck with your goals. Let me know if you need any more info.