Hello,Aspirant
You can go through the below link how to calculate the percentile:
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-normalisation-process-how-scores-are-calculated/amp

You will get an idea about percentile calculation by above link.
Are you can use this formula to predict the rank but it may differ from official rank which was released on the month of April:

Rank Formula = (100 - your total score) X 874469 /100.

For advance you should get rank below 224000 .who got below these are eligible.maybe this cutoff also change.
Because after conducting the second jEE mains exam on April.on the basis of best of two exam scores is considered for rank.so you have to wait for official results released by national testing agency NTA on the month of April.


If you have any questions further let me know.
Thank you!!!!

Hello Kumaraswamy , you can check your rank and your chances for qualifying for JEE Advanced by using the below link:

https://www.google.com/url?q=https://engineering.careers360.com/jee-main-rank-predictor&sa=D&source=hangouts&ust=1548220100044000&usg=AFQjCNE4NV-FhJGHaGw42SWhuxzJ6aDPnA

All the best for your future endeavours and wishing the best for you.  

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