Applied Mechatronics’ AppSizer tool is designed for sizing servo, stepper, AC, or DC motors into a motion control application. It’s an easy to use app for calculating motor torque and velocity requirements, system inertia , and motion system performance for the most common mechatronic positioning systems: rotary loads, screw driven devices, and rack & pinion and belt & pulley mechanisms.

AppSizer features individual pages for sizing the most common motion control applications. Each application page allows you to enter drivetrain and move profile details, such as move distance and time, mechanical reduction and efficiency, and other system details. It will then provide you with the motor performance requirements for triangular and trapezoidal move profiles, and can calculate the load to motor inertia mismatch, which is key to a properly sized motion system.

The AppSizer includes the following pages:
•Calculators - tools for converting rotary motion to linear velocity, rotary torque to linear thrust, a horsepower calculator, and inertia and torque converters.
•Rotary Load Mechanism Motor Sizer
•Screw Drive Mechanism Motor Sizer
•Rack & Pinion Mechanism Motor Sizer
•Belt & Pulley Mechanism Motor Sizer

AppSizer employs widely accepted kinematic engineering formulae that we’ve used in our 30 years of sizing and applying motion systems, now with the added convenience of being able to perform them on your mobile device anywhere.

Please visit our FAQ page at

(Disclaimer: Applied Mechatronics LLC has developed the AppSizer tool as a guide for helping size your motion system. The parameters that are calculated should not be used for final motor selection unless reviewed and approved by a licensed professional engineer. The customer is ultimately responsible for their machine design. By downloading the AppSizer you agree to indemnify Applied Mechatronics LLC of all potential liability caused by misuse, application misunderstanding, or errors.)

What's New

Version 1.1.1

Fixes a bug on the Calculators tab that was producing an inverse result.

Ratings and Reviews


Very useful for quick motion calc estimates

This applications great for doing quick motion control application estimates. It's a must have for anyone who is regularly working on motion control apps, or even for someone who wants a simple quick way to check their sizing estimates.

Mr. Physix

Thank you Applied Mechatronics

This is a fantastic app. Highly accurate. I've been waiting for someone to come out with a motor sizing app.

Hard rock dave

Awsome app

Very intuitive and easy to use. Recommended!


Applied Mechatronics, LLC
15.7 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Age Rating
Rated 4+
© 2016 Applied Mechatronics


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.