Calculating a gate score is a simple task.

The GATE percentile is calculated by a simple formula:

P = ( (N - your rank)/ N) x 100

Where

P : percentile

N : total number of candidates appeared for exam.

(N- Your rank) indicates the number of candidates who have scored less marks than you.

Example:

My rank is 100.

Total Appeared is 18000

My GATE score is 409

P = ( (18000-100)/18000 x 100 = 99.44 %

so your percentile is 99.44

Note: Still IITK does not released total number of candidates appeared for exam. Wait for a while. 

As per our experience approximately XL -10,000 and BT - 20000 students might have attended 2015 GATE Exams.