Calculating the flow rate inside a pipe

Calculate the volume flow rate per time unit.

 

Input: Flow rate, pipe inner diameter

Output: Flow rate per unit time

 ml/h  cu in/h
 ml/min  cu in/min
 ml/sec  cu in/sec
 l/h  us gal/h
 l/min  us gal/min
 l/sec  us gal/sec
 m3/h  barrel oil/h
 m3/min  barrel oil/min
 m3/sec  barrel oil/sec