I don't know the computer you're talking about, but I do know a little bit about fat grams. I've read that if we're trying to lose weight, we should try to consume less than 40 grams of fat per day (less than 60, for men), and probably closer to 20. So maybe your computer is telling you how many fat grams you've burned so you can figure the difference between what you've consumed for the day and what you've burned? Just a thought.