Revolutions per minute converted to hertz.
Revolutions per minute to Millihertz Converter — rpm to mHz
Convert Revolutions per minute (rpm) to Millihertz (mHz) using the exact conversion factor (1 revolutions per minute = 16.66666667 millihertz). See the formula, worked examples, conversion table, history, and common uses.
Revolutions per minute to Millihertz converter
Converter
Frequency Converter
Convert hertz, SI frequency prefixes, RPM, beats per minute, and angular frequency.
Context values
Some unit families need one extra value for a physically accurate result.
Millihertz is 0.001 hertz units.
Result = input x 0.01666666667 / 0.001.
Frequency uses hertz as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Revolutions per minute to Millihertz
Revolutions per minute and Millihertz both describe how fast something cycles or rotates, and the conversion is a routine part of reading a car tachometer or motor spec sheet against a scientific frequency figure. Revolutions per minute is most often used for engine and motor speed specifications (car tachometers).
Formula
millihertz = revolutions per minute × 16.6666666667
This factor comes from each unit's defined relationship to the category's base unit: 1 revolutions per minute equals 0.0166666666667 base units, and 1 millihertz equals 0.001 base units, so dividing one by the other gives the direct revolutions per minute-to-millihertz factor of 16.6666666667.
Simple example
1 rpm × 16.66666667 = 16.66666667 mHz
1 revolutions per minute = 16.66666667 millihertz.
Real-world example
1,000 rpm × 16.66666667 = 16,666.66667 mHz
1,000 revolutions per minute = 16,666.66667 millihertz.
Conversion table
| Revolutions per minute (rpm) | Millihertz (mHz) |
|---|---|
| 60 rpm | 1,000 mHz |
| 600 rpm | 10,000 mHz |
| 1,000 rpm | 16,666.66667 mHz |
| 3,000 rpm | 50,000 mHz |
| 6,000 rpm | 100,000 mHz |
| 10,000 rpm | 166,666.6667 mHz |
Reverse conversion: Millihertz to Revolutions per minute
16.66666667 mHz × 0.06 = 1 rpm
16.66666667 millihertz = 1 revolutions per minute.
revolutions per minute = millihertz × 0.06
For a page dedicated to this direction, see Millihertz to Revolutions per minute.
Understanding the Revolutions per minute
Revolutions per minute (rpm) measures rotational speed. RPM (revolutions per minute) equals hertz divided by 60, since one revolution per minute is 1/60 of a cycle per second. It is classified as a Non-SI unit (mechanical/automotive).
Where it's used: Used worldwide in automotive, mechanical, and industrial contexts
Uses of the Revolutions per minute today
- Engine and motor speed specifications (car tachometers)
- Industrial machinery and turbine speed ratings
- Hard drive and disc rotational speed
History of the Revolutions per minute
RPM developed alongside rotating machinery in the 19th-century industrial era as a practical, directly-readable way to describe rotational speed (a tachometer counting revolutions per minute), rather than converting to the more abstract cycles-per-second used in physics.
Historical origin. Revolutions per minute was not the invention of a single named person; it developed through the process described above.
Understanding the Millihertz (mHz)
Millihertz is 0.001 hertz units.
Revolutions per minute — sources
- NIST Special Publication 811 — General guide to non-SI unit conventions including rotational speed.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millihertz are in 1 revolutions per minute?
1 revolutions per minute equals 16.66666667 millihertz, using the exact defined conversion factor rather than an estimate.
How do I convert revolutions per minute to millihertz?
Multiply the revolutions per minute value by 16.66666667. The converter above does this instantly to whatever precision you set.
How do I convert millihertz back to revolutions per minute?
Use the reverse factor: 1 millihertz equals 0.06 revolutions per minute. You can also use the swap control in the converter above to flip the direction instantly.
What is a revolutions per minute?
Revolutions per minute (rpm) measures rotational speed. RPM (revolutions per minute) equals hertz divided by 60, since one revolution per minute is 1/60 of a cycle per second. It is classified as a Non-SI unit (mechanical/automotive).
What is a millihertz?
Millihertz (mHz) is a unit of frequency.
Is the revolutions per minute to millihertz conversion exact?
Yes. Both revolutions per minute and millihertz are defined by fixed standards rather than physical artifacts, so the factor of 16.66666667 used above is exact to as many digits as you choose to display.
Where is the revolutions per minute still used today?
Used worldwide in automotive, mechanical, and industrial contexts