STEAK!!!!!! Fat/protein etc....

I use the weight of my steak (cut included) before cooking.   Grilling renders off a decent amount of fat and weight (3oz. On my last porterhouse) . 

Im curious as to know if it’s hettwr to weigh after or before? Are the numbers calculated based on raw or cooked ?!? 

I completely get it’s all an estimate when it comes to meat because  because every cut has different amounts Fat marbleization to meat ratio  but I’m just curious !!?!? 

Thanks and good. Luck.