Divide the flow rate in cubic centimeters per second by 3,785.4 to convert to gallons per second. For example, if you have a flow rate of 20,000 cm/s, divide 20,000 by 3,785.4 to get 5.28 gal/s.
Divide the flow rate in gallons per second by 60 to convert to gallons per minute. In this example, divide 5.28 by 60 to get 0.09 gpm.
Divide the flow rate in cubic centimeters per second by 227,124 to convert to gallons per minute in one step. In this example, check your answer by dividing 20,000 cubic centimeters per second by 227,124 to verify your answer of 0.09 gpm.