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Hertz to RPM Converter

Convert frequency in hertz to revolutions per minute (RPM), with revolutions per second and other units alongside.

What this tool does

Convert frequency in hertz to revolutions per minute (RPM), with revolutions per second and other units alongside. Type an amount in hertz, choose the units, and the tool converts it to revolutions per minute (rpm). It offers 7 frequency units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Hertz, Revolution per minute (rpm), Revolution per second, Cycle per minute, Radian per second (angular frequency), Degree per second (angular frequency), Kilohertz. Starts as Hertz.
  • To: Choose one of the same 7 units as "From". Starts as Revolution per minute (rpm).

How to use

  1. Enter the amount you want to convert.
  2. Choose the unit to convert from and the unit to convert to.
  3. Read the result: the converted amount and the same amount in the other units. It appears once every required field has a valid value.

Worked examples

Conversions from hertz to revolutions per minute (rpm):

  • 1 Hz = 60 rpm
  • 5 Hz = 300 rpm
  • 10 Hz = 600 rpm
  • 50 Hz = 3,000 rpm
  • 100 Hz = 6,000 rpm

Multiply the number of hertz by 60 to get revolutions per minute (rpm). Both units are exact definitions, so 60 is the exact factor: 1 Hz = 60 rpm.

Sources: Hertz: SI Brochure, 9th edition (2019). Revolution per minute (rpm): exact by definition.

Limitations

  • Converts the unit of a frequency only. It does not know the pole count of a motor or any gear ratio.
  • Assumes one cycle equals one revolution.
  • Radians per second and degrees per second are angular frequency: one cycle is 2 pi radians or 360 degrees.

FAQs

Q: How do I convert hertz to RPM?
A: Multiply the hertz by 60, because there are 60 seconds in a minute. For example, 1 Hz is 60 RPM.
Q: Does this treat one cycle as one revolution?
A: Yes. It assumes one cycle of the frequency is one full turn. For a device where the frequency is not the shaft speed, such as a motor with several pole pairs, the shaft speed differs.

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