▸ processconvert
Frequency

rphtomHz

Convert revolutions per hour (rph) to millihertz (mHz).

Factor1 rph = 0.2777778 mHz

Converter

rph

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

Result
16.6667mHz

Rendered to 6 significant figures.

Formula

Formula
mHz = rph × 0.2777778

Multiply any value in revolutions per hour by 0.2777778 to obtain the value in millihertz.

Worked example

Convert 60 rph to mHz.

  1. 01Start with 60 rph.
  2. 02Multiply by the conversion factor: 60 × 0.2777778 = 16.6667 mHz.
Result60 rph = 16.6667 mHz

Conversion table

rphmHz
10.27778
20.55556
51.3889
102.7778
205.5556
5013.889
10027.778
20055.556
500138.89
1000277.78

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from rph to mHz?
1 rph equals 0.2777778 mHz. To convert, multiply the value in revolutions per hour by 0.2777778.
How do I convert 1 rph to mHz?
1 rph = 0.277778 mHz. For any value, multiply by 0.2777778.
How do I convert mHz back to rph?
Divide by the same factor — or equivalently, multiply by 3.6. So 1 mHz = 3.6 rph.
When would I need to convert revolution per hour to millihertz?
Frequency conversions between rph 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).

Related conversions