Say take the example for PCM in which 276166 students appeared for
the exam. To calculate the MHT CET rank 2019 rank, you first need to know the
percentage of people ahead of you with higher percentile scores. To calculate
that, the formula would be 100 which is the highest score minus your percentile
score.
Since the percentile is calculated from a scale ranging from 100
to 0, the formula applies the total number of students which is 276166 /100
multiplied by the percentage of people who are ahead of you to arrive at the
rank.

Therefore, the formula to calculate the rank is Probable Rank = (100- percentile score) X 276166 /100

Let's take an example,

If percentile score is 90.70, rank will be
(100-90.70) X 276166/100 = 25683

I hope this helps you.. Thank you.