Millihertz (mHz)
One thousandth of a hertz: one cycle every 1,000 seconds.
1 millihertz = 0.001 hertz (exactly).
About the millihertz
Millihertz describes oscillations so slow that a single cycle takes many seconds. One millihertz is 0.001 hertz, a period of 1,000 seconds, or about 16.7 minutes. At the other end of the scale, one revolution per minute works out to roughly 16.7 mHz, which is how a clock's second hand turns.
Slow phenomena are the natural home of the unit. The planned space-based gravitational-wave detector LISA is designed to operate from 0.1 to 10 mHz, a band that ground detectors cannot reach. The milli prefix is the SI factor of one thousandth, so a millihertz is a thousand times smaller than a hertz and a billion times smaller than a terahertz. Where signals are slower still, such as a daily cycle near 11.57 microhertz, microhertz take over.
Sources: Wikipedia: Hertz; Wikipedia: Orders of magnitude (frequency); Wikipedia: Revolutions per minute
Millihertz conversion chart
1 millihertz expressed in every other frequency unit:
| Unit | 1 millihertz |
|---|---|
| Hertz | 0.001 |
| Kilohertz | 0.000001 |
| Megahertz | 1×10⁻⁹ |
| Gigahertz | 1×10⁻¹² |
| Revolutions Per Minute | 0.06 |
| Beats Per Minute | 0.06 |
| Terahertz | 1×10⁻¹⁵ |
| Radians Per Second | 0.006283185307 |
| Degrees Per Second | 0.36 |
More Metric (SI) units
- hertz (frequency)
- kilohertz (frequency)
- megahertz (frequency)
- gigahertz (frequency)
- terahertz (frequency)
- revolution per minute (frequency)
- beat per minute (frequency)
- meter (length)
- kilometer (length)
- centimeter (length)
- millimeter (length)
- micrometer (length)
- nanometer (length)
- picometer (length)
- decimeter (length)
- hectometer (length)
Browse all frequency units.