# What are the Jx Jy and Jz values in RobotLoad

**URL:** <https://tech-community.robotics.abb.com/t/what-are-the-jx-jy-and-jz-values-in-robotload/11015>\
**Category:** RobotStudio\
**Created:** [February 4, 2023, 6:51pm UTC](https://tech-community.robotics.abb.com/t/what-are-the-jx-jy-and-jz-values-in-robotload/11015 "2023-02-04T18:51:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![gxfricke](https://avatars.discourse-cdn.com/v4/letter/g/ac8455/32.png) [@gxfricke](https://tech-community.robotics.abb.com/u/gxfricke)\
**Post date:** [February 4, 2023, 6:51pm UTC](https://tech-community.robotics.abb.com/t/what-are-the-jx-jy-and-jz-values-in-robotload/11015/1 "2023-02-04T18:51:22Z")

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I’m trying to use RobotLoad for the first time and I can’t find any information on what the Jx, Jy and Jz values are. I have all of the CAD data for my tool and load, I just don’t know how these values correlate to the CAD data.

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**Author:** ![matti](https://avatars.discourse-cdn.com/v4/letter/m/e480ec/32.png) [@matti](https://tech-community.robotics.abb.com/u/matti)\
**Post date:** [February 6, 2023, 12:47pm UTC](https://tech-community.robotics.abb.com/t/what-are-the-jx-jy-and-jz-values-in-robotload/11015/2 "2023-02-06T12:47:57Z")

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Hallo,  
J is the moment of inertia for each axis. It tells something about the mass distribution around an axis.  
(or a resistance against acceleration)

You can get this easily from CAD when looking for mass and mass center of an object.  
Unit is kgm².