Dear, Abhishek

It is hard to tell you the percentile but i can tell you on the basis of Rank so you can predict after the getting rank result. these cut-off can vary littile bit. But you can predict basis on this. there are institute name and category.

JEE-Main 2018 Cutoff B.Arch/B.Planning

(1) Malaviya National Institute of Technology, Jaipur

General         1263

OBC-NCL       779

SC                275

ST                51

(2) Maulana Azad National Institute of Technology, Bhopal   

General        1629

OBC-NCL      772

SC               288

ST               139

(3) National Institute of Technology, Calicut

General        1323

OBC-NCL      506

SC               145

ST                84

(4) National Institute of Technology, Hamirpur

General         1902

OBC-NCL       888

SC                194

ST                122

(5) National Institute of Technology, Patna

General        2092                                                                                                                      OBC-NCL      930

SC                377

ST                170

(6) National Institute of Technology, Raipur

General         1977

OBC-NCL       883

SC                281

ST                159

(7) National Institute of Technology, Rourkela

General        1469

OBC-NCL       610

SC                172

ST                111

(8) National Institute of Technology, Tiruchirappalli

General         670

OBC-NCL      319

SC               152

ST               42

(9) Visvesvaraya National Institute of Technology, Nagpur

General       1578

OBC-NCL     700

SC              240

ST              119

I think above information may help you.

All the best.