Pulse-aware conversion
Accounts for encoders, teeth, blades or repeated sensor events.
Convert a measured event frequency into rotational speed while accounting for encoder pulses, gear teeth, fan blades, motor poles, or other repeated events per revolution.
RPM = Hz x 60 / pulses per revolution x output-to-source speed ratio.
Accounts for encoders, teeth, blades or repeated sensor events.
Models simple gearbox, pulley or transmission relationships.
Shows RPM, revolutions per second and seconds per revolution.
Hertz means events per second, while RPM means revolutions per minute. If one measured event represents one complete revolution, multiply hertz by 60. For example, 50 Hz equals 3,000 RPM in a direct one-event-per-revolution relationship.
Many sensors produce more than one event per revolution. An encoder may emit dozens or thousands of pulses, a toothed wheel may create one pulse per tooth, and an optical sensor may see multiple blades. Divide measured hertz by the number of pulses or events per source revolution before multiplying by 60.
The optional speed ratio converts source rotational speed to an output shaft. Enter output RPM divided by source RPM: use 0.5 when the output turns at half source speed and 2 when it turns twice as fast. AC motor speed also depends on pole count and slip, so electrical supply frequency is not automatically equal to mechanical revolutions per second.
| Input | What it means | Planning note |
|---|---|---|
| Input frequency | Measured pulses or events each second | Identify what one event represents before converting. |
| Pulses per revolution | Events generated by one source revolution | Use encoder PPR or the actual sensed feature count. |
| Speed ratio | Output RPM divided by source RPM | Include gearing only when the desired output differs from the source. |
| RPM | Output revolutions per minute | Validate against equipment limits and measurement tolerances. |
Convert pulse frequency into shaft RPM.
Account for blade-pass events when estimating rotation.
Relate measured frequency, gearing and output speed.
At one event per revolution and a 1:1 ratio, 1 Hz equals 60 RPM.
A direct one-event-per-revolution conversion gives 3,000 RPM, but motors and sensors may require pole, pulse, ratio and slip adjustments.
It is the number of measured pulses or repeated events produced during one complete source revolution.
Motor synchronous speed depends on pole count, and induction motors also operate with slip below synchronous speed.
Last reviewed: August 23, 2026. Electromagnetic calculations use 299,792,458 m/s in vacuum and the selected refractive-index approximation.
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