Some tools collect data in counts but that isn't a very useful number when trying to understand how much time
- Divide the cycles by the clock rate of the machine in MHz to get microseconds.
- Divide the result by 1000 in order to get milliseconds as shown by the formula below:
msec = (cycles/clockrate)/1000
For example, on a 2.993GHz machine, a function with 36040 cycles would convert as (36040/2993)/1000, which is 12.04143 usec or .01204 milliseconds.
From this link