Hertz to Millihertz Converter
One Hertz equals 1000 Millihertz (1 Hz = 1000 mHz). Multiply a Hertz value by 1000 to get the equivalent in Millihertz. Use the calculator above for your value, or check the examples and reference table below.
Formula
mHz = Hz × 1000
Multiply the Hertz value by 1000 to get the equivalent value in Millihertz.
Example Conversions
1 Hertz (Hz)
1000 Millihertz (mHz)
5 Hertz (Hz)
5000 Millihertz (mHz)
10 Hertz (Hz)
10000 Millihertz (mHz)
25 Hertz (Hz)
25000 Millihertz (mHz)
100 Hertz (Hz)
100000 Millihertz (mHz)
Conversion Table
| Hertz (Hz) | Millihertz (mHz) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to Convert Manually
Use these steps to convert Hertz values to Millihertz without the calculator.
- Write down the value in Hertz (Hz) that you want to convert.
- Multiply that value by 1000.
- For example, 10 Hertz × 1000 = 10000 Millihertz.
- Label the result as Millihertz (mHz).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Hertz and one Millihertz.
About Hertz and Millihertz
The hertz is the SI derived unit of frequency: one cycle per second, named after Heinrich Hertz. Sound pitch, mains electricity (50/60 Hz), and display refresh all measure in hertz. The millihertz is one thousandth of a hertz: one cycle every 1,000 seconds. Very slow oscillations like tides, building sway, and biological rhythms are measured in millihertz. One Hertz equals 1000 Millihertz (1 Hz = 1000 mHz). Hertz is used in audio pitch and tuning and in mains power frequency. Millihertz is used in tidal and seismic oscillations.
Precision and Rounding:Frequency conversions are exact decimal shifts except rpm and rps, which involve the factor 60. Audio and radio work round to convenient figures; clock signals, tuning, and rotating machinery balancing need the unrounded value.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Hertz equals15000Millihertz.
15 Hz × 1000 = 15000 mHz
FAQ
How do I convert Hertz to Millihertz?
Multiply the Hertz value by 1000 to get the equivalent value in Millihertz.
What is the formula for Hertz to Millihertz?
The formula is mHz = Hz × 1000.
How many Millihertz are in 1 Hertz?
1 Hertz equals 1000 Millihertz.
Can I convert Millihertz back to Hertz?
Yes. 1 Millihertz equals 0.001 Hertz, and the related converter can reverse the calculation.
What are common names for Hertz and Millihertz?
Hertz is shown as Hz and may also be searched as hertz. Millihertz is shown as mHz and may also be searched as millihertz.
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