how many calories are we suppose to burn in one day ?

i did the gastric bypass about 10 months ago, i now weigh 236 pd  my height is 5'6" i already lost 106 pds. i go on the tredmill 5 times a week i burn 780 calorie in one day, but my weight lose is slow im only losing 5 pds a month, ( this has happening in the last 3 month.)  help me ( im doing the 5 day pouch test ) i need some helpful ideas, if anybody has any please let me know.

I have no idea if this is accurate or not but at the bottom right of this page has an estimete of how many calories you need to maintain your weight.  I have no idea if it's accurate or not. http://www.thinnerself.com/files/calculator.htm You have to put in your information at the top to get the results.