How to calculate Aggregate?

Aggregate of all Semesters of any degree means aggregate % of all semesters that you have appeared for so far starting from sem1 (upto latest results) 
(diploma shud not be counted. diploma students start from sem 3 onwards) 

  correct method of calc aggregate is :
[ (Total of all marks obtained in all semesters so far) / (Total of all maximum(out of) marks of all semesters so far) ] x 100

  Final year aggregate is different from the above . It is the aggregate of final year semesters only.