Frequency
rpdtomHz
Convert revolutions per day (rpd) to millihertz (mHz).
Factor1 rpd = 0.01157407 mHz
Converter
rpd
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mHz
Rendered to 6 significant figures.
Formula
Formula
mHz = rpd × 0.01157407
Multiply any value in revolutions per day by 0.01157407 to obtain the value in millihertz.
Worked example
Convert 1 rpd to mHz.
- 01Start with 1 rpd.
- 02Multiply by the conversion factor: 1 × 0.01157407 = 0.0115741 mHz.
Result1 rpd = 0.0115741 mHz
Conversion table
| rpd | mHz |
|---|---|
| 1 | 0.011574 |
| 2 | 0.023148 |
| 5 | 0.05787 |
| 10 | 0.11574 |
| 20 | 0.23148 |
| 50 | 0.5787 |
| 100 | 1.1574 |
| 200 | 2.3148 |
| 500 | 5.787 |
| 1000 | 11.574 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from rpd to mHz?
1 rpd equals 0.01157407 mHz. To convert, multiply the value in revolutions per day by 0.01157407.
How do I convert 1 rpd to mHz?
1 rpd = 0.0115741 mHz. For any value, multiply by 0.01157407.
How do I convert mHz back to rpd?
Divide by the same factor — or equivalently, multiply by 86.4. So 1 mHz = 86.4 rpd.
When would I need to convert revolution per day to millihertz?
Frequency conversions between rpd and mHz are needed in signal and RF engineering, motor and turbomachinery rotational-speed work, vibration and pulse-rate analysis, and control-loop sample-rate specification. Hz dominates electronics and instrumentation; kHz, MHz and GHz cover audio through microwave; rpm and rps dominate mechanical rotational equipment; cycles per minute, second and hour cover slow industrial cyclic processes. Angular frequency (rad/s) and time-period (Hz ↔ seconds) conversions are NOT included — they require either a 2π factor or a reciprocal relationship.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).