Motor Pie 4+

Motor Calculations made easy‪!‬

Pork Pie Software Limited

Designed for iPhone

    • 4.4 • 9 Ratings
    • $3.99

iPhone Screenshots


Speed, Power, Torque, Current, and many more motor based calculations in the palm of your hand! Includes supporting theory and worked examples. Knowledge is Power!

Motor calculations made easy!

As with all our apps this app provides the underlying maths and theory behind the calculations together with worked examples. This will allow you to not just get an answer, but more more importantly to understand how the answer was derived.

This app is written to allow you to undertake ac electric motor calculations with ease. The following two features are available within the app:


This feature provides the following four tools:

Speed RPM: Upon entering a motor’s supply frequency, number of poles, and percentage slip if applicable, the motor’s synchronous speed and slip speed in RPM is calculated.

Output Power: Upon entering a motor’s phase or line voltage, current, power factor, and efficiency the the motor’s mechanical output power in kW and horsepower HP is calculated.

Torque: Upon entering a motor’s shaft power and shaft speed the motor’s torque in Nm and foot-pounds (lbf⋅ft) is calculated.

Speed Rads/s: Upon entering a motor’s shaft speed the motor’s angular speed in Radians per second is calculated.

Horse Power to kW Converter: Upon entering a Horse Power output power, the app calculates the corresponding kWm output power. By toggling the input value the reverse can also be calculated.


This feature provides the following two tools:

Full Load Current: Upon entering a motor’s mechanical power rating together with its phase or line voltage, power factor, and efficiency the motor’s full load current current (Amps) is calculated.

Input Power: Upon entering a motor’s mechanical power rating together with its power factor and efficiency the motor’s electrical input power in kW and kVA is calculated.

“Written by Engineers for Engineers”

About Pork Pie Software:

Pork Pie Software is a mobile app development company based in New Zealand. Our apps are actually written and coded by real engineers that practice in the engineering area that each app is written in.

All feedback and suggestions are genuinely welcome. As we write our own apps we can quickly update and improve our apps based on your feedback.

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What’s New

Version 1.7.2

Thanks for using our Motor Pie app. We’re constantly improving this app in conjunction with your feedback to make this app even better.

This update includes:

• Updated the Full Load Current feature so you can now provide your motor power in both kW and Horse Power (Hp) and convert between the two.

If you like the app, please leave us a review!

“Written by Engineers for Engineers”

Ratings and Reviews

4.4 out of 5
9 Ratings

9 Ratings

App Privacy

The developer, Pork Pie Software Limited, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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