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Frequency

rpdtorph

Convert revolutions per day (rpd) to revolutions per hour (rph).

Factor1 rpd = 0.04166667 rph

Converter

rpd

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1rph

Rendered to 6 significant figures.

Formula

Formula
rph = rpd × 0.04166667

Multiply any value in revolutions per day by 0.04166667 to obtain the value in revolutions per hour.

Worked example

Convert 24 rpd to rph.

  1. 01Start with 24 rpd.
  2. 02Multiply by the conversion factor: 24 × 0.04166667 = 1 rph.
Result24 rpd = 1 rph

Conversion table

rpdrph
10.041667
20.083333
50.20833
100.41667
200.83333
502.0833
1004.1667
2008.3333
50020.833
100041.667

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from rpd to rph?
1 rpd equals 0.04166667 rph. To convert, multiply the value in revolutions per day by 0.04166667.
How do I convert 1 rpd to rph?
1 rpd = 0.0416667 rph. For any value, multiply by 0.04166667.
How do I convert rph back to rpd?
Divide by the same factor — or equivalently, multiply by 24. So 1 rph = 24 rpd.
When would I need to convert revolution per day to revolution per hour?
Frequency conversions between rpd and rph 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).

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