Calculating Output Frequency for Rotary Encoders

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Here are three handy calculations for incremental rotary encoders:

Frequency  = (RPM X Line Count/60)

Use this formula when line count of the encoder and RPM are known.  The answer is in Hertz (Hz) or cycles per second.  Keep in mind that many encoders and drives will have a Maximum frequency limit that you should not exceed.

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Line Count = (Frequency X 60/RPM)

Use this calculation when Frequency and RPM are known.  Can be useful for determining the highest resolution encoder you can use without over driving the Maximum output specifications on the encoder or equipment it is being connected to.

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RPM = (Frequency X 60/Line Count)

Use this formula when frequency and Line count are known. This is useful when you are trying to determine the speed of rotation.

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Quantum Devices Inc. has a calculator for finding RPM, Encoder output Frequency,  or Line count (Resolution) when given the other two variables.

You can check it out here : http://www.quantumdev.com/Calculator.html


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Quantum Devices is a manufacturer of rotary encoders.  Incorporating QDI’s patented sensor technology, our QPhaseTM Family of Encoders feature high resolution, increased frequency response and superior reliability over temperature (0 to 120 degrees C). QDI incremental and absolute encoders set a new standard and are backed by a 2 year factory warranty. We invite you to request an evaluation unit, additional information or price quotations.

The Quantum Devices main web site can be found at www.quantumdev.com

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About Quantum Devices Inc.
Quantum Devices, Inc. (QDI) Barneveld, WI, was established as a Wisconsin corporation in October 1989, as an outgrowth of activities in the general area of optoelectronics. The main goal of QDI is to provide customers with a complete source for all stages of product design and development, starting from concept to a marketable commodity. These products include application specific Silicon Photodiodes, Optical Encoders and Light Emitting Diodes (LED) for commercial, industrial and medical applications. QDI's photodiodes and LED's are used in instrumentation for photosynthesis and photobiological research, biomedical and medical instrumentation for measuring blood sugar levels (glucometer), oxyhemoglobin and pulse rate (pulse oxymeter). One of the most dramatic products developed at QDI was the application of LED lighting systems for use as the light source for Photodynamic Therapy (PDT). Sales of QDI products include both domestic and international markets. Quality and reliability are very important concepts in maintaining our company wide commitment to overall product performance. Quality simply means continuous process improvement. We are committed to continually increasing our product excellence through increased quality and reliability. Quantum Devices, Inc. is ISO 9001 certified and the ISO Standard will provide the guidance for the vital function of maintaining our commitment to constantly improve our product quality. Quantum Devices is now proud to introduce it's new line of rotary encoders. Incorporating QDI's patented sensor technology, our QPhase™ Family of Encoders feature high resolution, increased frequency response and superior reliability over temperature (0 to 120 degrees C). QDI incremental and absolute encoders set a new standard and are backed by a 2 year factory warranty. We invite you to request an evaluation unit, additional information or price quotations. Mission Statement Quantum Devices is dedicated to the principle that light provides the power for all life on earth. We believe the quality, delivery and control of light is essential to the wellness of man and his advancement into the future.

One Response to Calculating Output Frequency for Rotary Encoders

  1. Pingback: Optical Encoder Calculator « Quantum Devices INC

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