How do you calculate the amount of Kcals you burn a day?

[FREAKZILLA]

To burn fat you eat less than you burn correct? how do you know how much your burning?

[BFGUITAR]

There are a bunch of calculations you could do but the simplest way is to eat the same amount of kcal every day for 2 weeks and measure your average change inw eight over those 2 weeks (weight yourself every day at the exact same time).