Millihertz is 0.001 hertz units.
Millihertz to Hertz Converter — mHz to Hz
Convert Millihertz (mHz) to Hertz (Hz) using the exact conversion factor (1 millihertz = 0.001 hertz). See the formula, worked examples, conversion table, history, and common uses.
Millihertz to Hertz 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.
The hertz is one cycle per second.
Result = input x 0.001 / 1.
Frequency uses hertz as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millihertz to Hertz
Millihertz and Hertz 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. Specifically: Millihertz is 0.001 hertz units, and the hertz is one cycle per second.
Formula
hertz = millihertz × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 millihertz equals 0.001 base units, and 1 hertz equals 1 base unit, so dividing one by the other gives the direct millihertz-to-hertz factor of 0.001.
Simple example
1 mHz × 0.001 = 0.001 Hz
1 millihertz = 0.001 hertz.
Real-world example
1,000 mHz × 0.001 = 1 Hz
1,000 millihertz = 1 hertz.
Conversion table
| Millihertz (mHz) | Hertz (Hz) |
|---|---|
| 60 mHz | 0.06 Hz |
| 600 mHz | 0.6 Hz |
| 1,000 mHz | 1 Hz |
| 3,000 mHz | 3 Hz |
| 6,000 mHz | 6 Hz |
| 10,000 mHz | 10 Hz |
Reverse conversion: Hertz to Millihertz
0.001 Hz × 1000 = 1 mHz
0.001 hertz = 1 millihertz.
millihertz = hertz × 1000
For a page dedicated to this direction, see Hertz to Millihertz.
Understanding the Millihertz (mHz)
Millihertz is 0.001 hertz units.
Understanding the Hertz
Hertz (Hz) measures frequency. The hertz is the SI derived unit of frequency: one cycle per second. It is classified as a SI derived unit.
Where it's used: Standard scientific unit worldwide; also everyday (AC power frequency, radio, audio)
Uses of the Hertz today
- Electrical power frequency (50/60 Hz worldwide)
- Radio, audio, and signal processing
- Computer processor clock speeds (GHz)
History of the Hertz
The hertz is named after Heinrich Hertz, who in 1886-1889 was the first to conclusively demonstrate the existence of electromagnetic waves predicted by Maxwell's equations. The unit ('cycles per second') was renamed in his honor and adopted internationally in 1930, becoming the SI derived unit of frequency in 1960.
Historical origin. Hertz was not the invention of a single named person; it developed through the process described above.
Hertz — sources
- BIPM SI Brochure — Coherent derived units — Defines the hertz as the SI unit of frequency.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many hertz are in 1 millihertz?
1 millihertz equals 0.001 hertz, using the exact defined conversion factor rather than an estimate.
How do I convert millihertz to hertz?
Multiply the millihertz value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert hertz back to millihertz?
Use the reverse factor: 1 hertz equals 1,000 millihertz. You can also use the swap control in the converter above to flip the direction instantly.
What is a millihertz?
Millihertz (mHz) is a unit of frequency.
What is a hertz?
Hertz (Hz) measures frequency. The hertz is the SI derived unit of frequency: one cycle per second. It is classified as a SI derived unit.
Is the millihertz to hertz conversion exact?
Yes. Both millihertz and hertz are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.