How to calculate CPM

I want to know how to calculate CPM basically I want the formula if anybody has that then let me know


@King_Kong
what I understand is this but I could be wrong.
CPM = Combo Per Minute
Means =Total Combo successfully processed (no error etc) per Time (in minute) elapsed
Basic mathematical calculation should be ex . if 90 combo/data took 3 minute to processed so CPM= 90/3 = 30
now you can use the pretty elegant way like @Ruri does ^__^

@Ruri Thanks

@Br4uN Thanks