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To convert from hertz (Hz) to millihertz (mHz), use the following formula:
millihertz (mHz)
= 1000× hertz (Hz)
Let's convert 5 hertz (Hz) to millihertz (mHz).
Using the formula:
5 × 1000 = 5000
Therefore, 5 hertz (Hz) is equal to 5000 millihertz (mHz).
How many hertz are in one millihertz? One millihertz (mHz) contains 0.001 hertz (Hz) — the inverse of the factor above. Multiplying by 1000 takes you from hertz to millihertz; multiplying by 0.001 brings you back.
Put in words: one hertz equals 1000 millihertz, so the hertz is the larger unit of this pair. Converting between them never changes the amount of frequency being measured — only the size of the unit you count it in.
Hertz (Hz) is the standard unit of frequency, measuring the number of cycles per second.
You encounter it everywhere in modern technology, from the sound you hear and the screen you're looking at to the speed of your computer's processor (CPU). The plural form is simply hertz.
The unit is named in honor of the German physicist Heinrich Rudolf Hertz.
In the late 1880s, he was the first person to provide conclusive proof of the existence of electromagnetic waves. His groundbreaking experiments laid the groundwork for the development of radio, television, and all forms of wireless communication.
Hertz is a fundamental measurement you encounter in everyday technology, often without realizing it. Here are two of the most common examples:
A sound's pitch is determined by its frequency (measured in hertz): higher frequencies produce higher pitches.
For example, the A above middle C on a piano is standardized at 440 Hz.
The refresh rate of your computer monitor, TV, or smartphone screen is measured in hertz.
This number indicates how frequently the display updates the image per second—a higher value results in smoother motion, which is especially noticeable in videos and gaming.
When discussing computer processors, you often hear the term gigahertz (GHz). One gigahertz is equal to one billion hertz (1 GHz = 109 Hz).
This value represents the processor's CPU clock speed—the number of processing cycles it can execute per second.
Before gigahertz became the standard, speeds were often measured in megahertz (MHz), where 1 GHz equals 1,000 MHz. While not the sole indicator of performance, a higher clock speed generally means a processor can perform calculations and execute instructions more quickly.
Ever wondered how scientists measure incredibly slow, barely-there movements, like the subtle shifting of continents or the rhythm of a distant star?
They often use a special unit of frequency called the millihertz (mHz).
A millihertz is a unit of frequency equal to one-thousandth of a hertz (0.001 Hz). It's designed to measure things that happen very, very slowly.
While a standard hertz (Hz) measures cycles per second (think sound waves or computer speeds), a millihertz measures events that occur very slowly, taking a very long time to complete a single cycle.
To put it in perspective, something oscillating at one mHz takes 1,000 seconds—or nearly 17 minutes—to complete just one cycle!
This makes the unit perfect for tracking extremely slow phenomena.
Key applications include:
Frequency and time are two sides of the same coin.
In physics, the time it takes for one complete cycle is called the period (T), while frequency (f) refers to the number of cycles that occur per second. They are inversely related: as one increases, the other decreases.
The relationship is expressed as T = 1/f.
To find the period in seconds from a frequency in mHz, you first convert mHz to Hz (1 mHz = 0.001 Hz) and then find its reciprocal.
Formula:
Example:
The mHz range is crucial for one of the most exciting fields in modern astronomy: the search for gravitational waves.
Space-based observatories, such as the Laser Interferometer Space Antenna (LISA), are specifically designed to detect low-frequency gravitational waves in the millihertz band.
These ripples in spacetime are believed to be caused by some of the most massive and dramatic events in the universe, such as:
Detecting signals in the millihertz band offers scientists a unique opportunity to explore cosmic events, allowing them to observe the universe in a completely new way.
Here are some quick reference conversions from hertz (Hz) to millihertz (mHz):
| hertz | millihertz |
|---|---|
| 0.000001 Hz | 0.001 mHz |
| 0.001 Hz | 1 mHz |
| 0.1 Hz | 100 mHz |
| 1 Hz | 1000 mHz |
| 2 Hz | 2000 mHz |
| 3 Hz | 3000 mHz |
| 4 Hz | 4000 mHz |
| 5 Hz | 5000 mHz |
| 6 Hz | 6000 mHz |
| 7 Hz | 7000 mHz |
| 8 Hz | 8000 mHz |
| 9 Hz | 9000 mHz |
| 10 Hz | 104 mHz |
| 20 Hz | 20000 mHz |
| 30 Hz | 30000 mHz |
| 40 Hz | 40000 mHz |
| 50 Hz | 50000 mHz |
| 100 Hz | 105 mHz |
| 1000 Hz | 106 mHz |
| 10000 Hz | 107 mHz |
For all Frequency converters, choose units using the From/To dropdowns above.