The hertz is one cycle per second.
Hertz to Millihertz Converter — Hz to mHz
Convert Hertz (Hz) to Millihertz (mHz) using the exact conversion factor (1 hertz = 1,000 millihertz). See the formula, worked examples, conversion table, history, and common uses.
Hertz 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 1 / 0.001.
Frequency uses hertz as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hertz to Millihertz
Hertz 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. Hertz is most often used for electrical power frequency (50/60 hz worldwide).
Formula
millihertz = hertz × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 hertz equals 1 base unit, and 1 millihertz equals 0.001 base units, so dividing one by the other gives the direct hertz-to-millihertz factor of 1000.
Simple example
1 Hz × 1000 = 1,000 mHz
1 hertz = 1,000 millihertz.
Real-world example
1,000 Hz × 1000 = 1,000,000 mHz
1,000 hertz = 1,000,000 millihertz.
Conversion table
| Hertz (Hz) | Millihertz (mHz) |
|---|---|
| 60 Hz | 60,000 mHz |
| 600 Hz | 600,000 mHz |
| 1,000 Hz | 1,000,000 mHz |
| 3,000 Hz | 3,000,000 mHz |
| 6,000 Hz | 6,000,000 mHz |
| 10,000 Hz | 10,000,000 mHz |
Reverse conversion: Millihertz to Hertz
1 mHz × 0.001 = 0.001 Hz
1 millihertz = 0.001 hertz.
hertz = millihertz × 0.001
For a page dedicated to this direction, see Millihertz to Hertz.
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.
Understanding the Millihertz (mHz)
Millihertz is 0.001 hertz units.
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 millihertz are in 1 hertz?
1 hertz equals 1,000 millihertz, using the exact defined conversion factor rather than an estimate.
How do I convert hertz to millihertz?
Multiply the hertz value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert millihertz back to hertz?
Use the reverse factor: 1 millihertz equals 0.001 hertz. You can also use the swap control in the converter above to flip the direction instantly.
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.
What is a millihertz?
Millihertz (mHz) is a unit of frequency.
Is the hertz to millihertz conversion exact?
Yes. Both hertz and millihertz are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.
Where is the hertz still used today?
Standard scientific unit worldwide; also everyday (AC power frequency, radio, audio)