For the analytical types- calories per minute

Hey everyone, I have a bodybugg and it shows calorie burn different than regular hrms, it actually shows me calories per minute burn, which got me to thinking about true workout caloric burn, and how I can log it, cause the BB tracks "activity" not necessarily work out periods , so i'm active 5 minutes going into work, and then 10 minutes her or there, and that adds up through out the day, so to figure out what I actually could log to mpf at the end of the day I would figure how many calories i burned per minute from living subtract that from total calories burned and I would get the "activity" calories. so here is an example

Basic components

60 minutes in an hour 24 hours in a day. (60*24=1440 minutes in a day)

I go under Goals in MPF and it says in a day i burn 1780 calories just living.

so i take 1780/1440 to get 1.236 (i'll round up to 1.3) So according to mpf I burn 1.3 calories per minute living
which btw is pretty accurate according to my body bugg

So now, lets say I work out for 60 minutes, and burn 300 calories (just an example) I take 1.3 *60 = 78 then 300-78 equals 222, which would then be my actual work out burn.

Like i said for the analytical types I am obviously very analytical.