To calculate the required CFM for a CPU cooler, you need to know the power consumption, fan power consumption, ambient temperature, and allowed CPU temperature. The formulas are:
Q = 0.09 P / ΔT (CMM)
Q = 3.16 P / ΔT (CFM)
Use the form above to input the values, and the calculator will provide the required airflow in both CMM and CFM.
The following known conditions must first be understood: