Hertz to millihertz
Type a value in hertz to see it in millihertz straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the hertz box.
- Read the result in millihertz as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mHz = Hz × 1,000
Multiply the value in hertz by 1,000 to get millihertz.
Example
To convert 25 Hz to millihertz: 25 × 1,000 = 25,000 mHz.
Conversion table
| Hertz (Hz) | Millihertz (mHz) |
|---|---|
| 1 | 1,000 |
| 2 | 2,000 |
| 3 | 3,000 |
| 5 | 5,000 |
| 10 | 10,000 |
| 20 | 20,000 |
| 25 | 25,000 |
| 50 | 50,000 |
| 100 | 100,000 |
| 250 | 250,000 |
| 500 | 500,000 |
| 1,000 | 1,000,000 |
About the units
- Hertz
- The hertz is the SI unit of frequency, one cycle per second, equal to the reciprocal second (s⁻¹).
- Millihertz
- A millihertz is one thousandth of a hertz, one cycle every 1000 seconds, used for slow phenomena such as seismic oscillations.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many millihertz are in one hertz?
1 Hz = 1,000 mHz exactly.
How do I convert hertz to millihertz?
Use mHz = Hz × 1,000. For example, 25 Hz = 25,000 mHz.
How many hertz are in one millihertz?
1 mHz = 0.001 Hz.
How many hertz is a 3.5 GHz processor?
3.5 GHz is 3500 MHz or 3.5 billion hertz, so the processor clock ticks 3.5 billion times per second. Clock speed alone does not decide performance; core count and design matter too.
How do I convert BPM to hertz?
Divide beats per minute by 60, so a tempo of 120 BPM is 2 Hz, two beats per second. The same works for heart rate: 72 beats per minute is 1.2 Hz.