Hello bankaru,
As you have secured 83.07 percentile in the jee main paper 2 it is good .
To calculate the rank for B.Arch:
100 - your total percentile score is the percentage of people ahead of you. 112679 are the number of candidates appeared for January exam.
So rank formula is (100 - your total score) X 112679 /100.
Your estimated rank will be 19127 rank of crl . To that rank cut off . It will be very difficult to grab a seat any NITs . Because  the competition is very high
All the best

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