Millihertz is 0.001 hertz units.
Millihertz to Petahertz Converter — mHz to PHz
Convert Millihertz (mHz) to Petahertz (PHz) using the exact conversion factor (1 millihertz = 1e-18 petahertz). See the formula, worked examples, and conversion table.
Millihertz to Petahertz 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.
Petahertz is 1000000000000000 hertz units.
Result = input x 0.001 / 1e+15.
Frequency uses hertz as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millihertz to Petahertz
Millihertz and Petahertz 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. Specifically: Millihertz is 0.001 hertz units, and petahertz is 1000000000000000 hertz units.
Formula
petahertz = millihertz × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 millihertz equals 0.001 base units, and 1 petahertz equals 1e+15 base units, so dividing one by the other gives the direct millihertz-to-petahertz factor of 1e-18.
Simple example
1 mHz × 1e-18 = 1e-18 PHz
1 millihertz = 1e-18 petahertz.
Real-world example
1,000 mHz × 1e-18 = 1e-15 PHz
1,000 millihertz = 1e-15 petahertz.
Conversion table
| Millihertz (mHz) | Petahertz (PHz) |
|---|---|
| 60 mHz | 6e-17 PHz |
| 600 mHz | 6e-16 PHz |
| 1,000 mHz | 1e-15 PHz |
| 3,000 mHz | 3e-15 PHz |
| 6,000 mHz | 6e-15 PHz |
| 10,000 mHz | 1e-14 PHz |
Reverse conversion: Petahertz to Millihertz
1e-18 PHz × 1e+18 = 1 mHz
1e-18 petahertz = 1 millihertz.
millihertz = petahertz × 1e+18
For a page dedicated to this direction, see Petahertz to Millihertz.
Understanding the Millihertz (mHz)
Millihertz is 0.001 hertz units.
Understanding the Petahertz (PHz)
Petahertz is 1000000000000000 hertz units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many petahertz are in 1 millihertz?
1 millihertz equals 1e-18 petahertz, using the exact defined conversion factor rather than an estimate.
How do I convert millihertz to petahertz?
Multiply the millihertz value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert petahertz back to millihertz?
Use the reverse factor: 1 petahertz equals 1e+18 millihertz. You can also use the swap control in the converter above to flip the direction instantly.
What is a millihertz?
Millihertz (mHz) is a unit of frequency.
What is a petahertz?
Petahertz (PHz) is a unit of frequency.
Is the millihertz to petahertz conversion exact?
Yes. Both millihertz and petahertz are defined by fixed standards rather than physical artifacts, so the factor of 1e-18 used above is exact to as many digits as you choose to display.