Enter the CPU fan speed, the number of pulses per second, and the number of pulses per revolution into the calculator to determine the missing variable.

CPU Fan Speed RPM Calculator

Enter any 2 values to calculate the missing variable


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CPU Fan Speed Formula

The following formula is used to calculate the CPU fan speed (RPM) for a given number of pulses per second and pulses per revolution.

RPM = (PPS * 60) / PPR

Variables:

  • RPM is the CPU fan speed in revolutions per minute
  • PPS is the number of pulses per second
  • PPR is the number of pulses per revolution

To calculate the CPU fan speed, multiply the number of pulses per second by 60 and then divide by the number of pulses per revolution.

What is a CPU Fan Speed?

CPU fan speed, measured in revolutions per minute (RPM), indicates how fast the fan is spinning. The fan speed is crucial for maintaining optimal temperatures within the computer case, ensuring that the CPU and other components do not overheat. Higher RPMs typically mean better cooling performance, but they can also result in increased noise levels. The fan speed can be controlled automatically by the motherboard based on temperature readings or manually adjusted through software or BIOS settings.

How to Calculate CPU Fan Speed?

The following steps outline how to calculate the CPU fan speed.


  1. First, determine the number of pulses per second (PPS).
  2. Next, determine the number of pulses per revolution (PPR).
  3. Finally, calculate the CPU fan speed using the formula RPM = (PPS * 60) / PPR.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Number of pulses per second (PPS) = 120

Number of pulses per revolution (PPR) = 4