Frequency
rpdtocycles/hr
Convert revolutions per day (rpd) to cycles per hour (cycles/hr).
Factor1 rpd = 0.04166667 cycles/hr
Converter
rpd
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cycles/hr
Rendered to 6 significant figures.
Formula
Formula
cycles/hr = rpd × 0.04166667
Multiply any value in revolutions per day by 0.04166667 to obtain the value in cycles per hour.
Worked example
Convert 24 rpd to cycles/hr.
- 01Start with 24 rpd.
- 02Multiply by the conversion factor: 24 × 0.04166667 = 1 cycles/hr.
Result24 rpd = 1 cycles/hr
Conversion table
| rpd | cycles/hr |
|---|---|
| 1 | 0.041667 |
| 2 | 0.083333 |
| 5 | 0.20833 |
| 10 | 0.41667 |
| 20 | 0.83333 |
| 50 | 2.0833 |
| 100 | 4.1667 |
| 200 | 8.3333 |
| 500 | 20.833 |
| 1000 | 41.667 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from rpd to cycles/hr?
1 rpd equals 0.04166667 cycles/hr. To convert, multiply the value in revolutions per day by 0.04166667.
How do I convert 1 rpd to cycles/hr?
1 rpd = 0.0416667 cycles/hr. For any value, multiply by 0.04166667.
How do I convert cycles/hr back to rpd?
Divide by the same factor — or equivalently, multiply by 24. So 1 cycles/hr = 24 rpd.
When would I need to convert revolution per day to cycle per hour?
Frequency conversions between rpd and cycles/hr 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).