Priyanshu, before the prediction of your admission chances in the NITs, please understand that NTA conducts two JEE papers viz. JEE MAINS PAPER1 and PAPER 2 for admission to B.Tech and B. arch courses respectively. You have not specified whether you want to inquire about your chances based on percentile secured in JEE MAIN PAPER-1 or JEE MAIN PAPER-2. So, I am going to answer your query taking into consideration that the query is about Paper2 and if your query was different, then you can let me know in the comments.

Now, to calculate your expected rank for B.Arch based on the percentile score that you have secured, you can use this formula:

So, (100 - your total percentile score) is the percentage of people ahead of you. Also, 112679 were the number of candidates who appeared for January exam.

So rank formula is (100 - your total score) X 112679 /100.

Also,note that the ranks will change according to increase or decrease in the number of participants in the next session.

Now, according to this formula, your expected rank is around 6986. Note that it is the expected All India Rank and not your category rank which is very difficult to predict at this point of time. As you may be knowing, the admission to any college also depends on your home state and gender status apart from your category and marks, of course, and since you have not given the details of the same so I am answering your query in a generic way. In your case, you have a decent percentile and the corresponding expected general or ALL INDIA RANK rank and you may get a B.Arch seat in some of the NITs (however the chances are not very high) although you would not probably get the best NITs based on your scores as they require a percentile close to 98 and above for admission in All India Quota. Now, here are some of the NITs where you can get admission based on previous years trends and your scores:-

NIT HAMIRPUR

NIT PATNA (based on home state considerations)

NIT RAIPUR

If you want to check the previous year cutoffs of NITs, you can visit this link

https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

However, you have a decent enough percentile and it could give you admission to some other decent state and private institutes accepting JEE Scores and hence you should try for the state level counselling as well.

Not only that, you have another attempt to go where you can try to perform better and increase your chances of getting desired colleges.

Also, if you want to predict your colleges using your scores, you can use this college predictor