# Reference planes

**URL:** <https://discourse.slicer.org/t/reference-planes/3538>\
**Category:** Support\
**Created:** [July 20, 2018, 10:43am UTC](https://discourse.slicer.org/t/reference-planes/3538 "2018-07-20T10:43:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![haylea.b](https://avatars.discourse-cdn.com/v4/letter/h/f07891/32.png) [@haylea.b](https://discourse.slicer.org/u/haylea.b)\
**Post date:** [July 20, 2018, 10:43am UTC](https://discourse.slicer.org/t/reference-planes/3538/1 "2018-07-20T10:43:12Z")

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Hi everyone, I am wondering how you can make your own reference plane on 3D Slicer? I also need help with calibrating the measurements for the ruler?  
thanks in advance for your support