I don't understand you question, how to calculate your BF% or how to burn body fat by working out?

My rec center has a unit called a bod pod. I've never used it, but other guys have. However, I don't think its perfectly accurate. Maybe 1-2 % off. But it will give you a general idea.

Here's some pictures to give u an idea
It just looks like some I don't agree with tho..

http://www.bodyfatpics.com

if you're a member at a gym they usually have personal trainers there that will measure your body fat for free, at least the gym i go to does that.

Caliper.. Google it

Clean diet and cardio ..... http://www.eroids.com/forum/general/general-talk/diet-clinic-now-live