Hey.

You can use the formula given below to calculate JEE B.Arch Rank from your percentile-

(100- your total percentile score) * 1,45,386/ 100.  

According to your percentile, on applying this formula you can expect a rank around 20,800. This is only a probable rank. You can expect a rank in a similar range. Also, the ranks are expected to change after considering the Results of the April session as the rank list will be prepared after considering the scores of both the sessions.

Best of luck!