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RPM to Hertz Converter

Convert rotational speed in revolutions per minute (RPM) to frequency in hertz (Hz), with other frequency units alongside.

What this tool does

Convert rotational speed in revolutions per minute (RPM) to frequency in hertz (Hz), with other frequency units alongside. Type an amount in revolutions per minute (rpm), choose the units, and the tool converts it to hertz. It offers 8 frequency units and also shows the same amount in the others.

Inputs

  • Value: A number.
  • From: Choose one: Revolution per minute (rpm), Hertz, Revolution per second, Millihertz, Kilohertz, Megahertz, Radian per second (angular frequency), Degree per second (angular frequency). Starts as Revolution per minute (rpm).
  • To: Choose one of the same 8 units as "From". Starts as Hertz.

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 revolutions per minute (rpm) to hertz:

  • 1 rpm ≈ 0.0166667 Hz
  • 5 rpm ≈ 0.0833333 Hz
  • 10 rpm ≈ 0.166667 Hz
  • 50 rpm ≈ 0.833333 Hz
  • 100 rpm ≈ 1.666667 Hz

Multiply the number of revolutions per minute (rpm) by about 0.0166667 to get hertz. The factor follows from exact definitions. It has more digits than fit here, so it is shown rounded.

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

Limitations

  • Converts the unit of a speed only. It does not know the pole count of a motor or any gear ratio.
  • Assumes one revolution equals one cycle.
  • 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 RPM to hertz?
A: Divide the RPM by 60, because there are 60 seconds in a minute. For example, 60 RPM is 1 Hz.
Q: Does this treat one revolution as one cycle?
A: Yes. It assumes each revolution is one cycle, which is the usual meaning of the hertz for rotation.

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