# Measurement/ ruler in 4.8

**URL:** <https://discourse.slicer.org/t/measurement-ruler-in-4-8/2020>\
**Category:** Support\
**Created:** [February 4, 2018, 9:56pm UTC](https://discourse.slicer.org/t/measurement-ruler-in-4-8/2020 "2018-02-04T21:56:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sarvraj\_Kohli](https://avatars.discourse-cdn.com/v4/letter/s/ecb155/32.png) [@Sarvraj\_Kohli](https://discourse.slicer.org/u/Sarvraj_Kohli)\
**Post date:** [February 4, 2018, 9:56pm UTC](https://discourse.slicer.org/t/measurement-ruler-in-4-8/2020/1 "2018-02-04T21:56:38Z")

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Hello  
Im a new slicer user, kindly enlighten me.

How can measure distances between two structure ( like measuring the length of a tooth on a CT scan)?

Can someone please provide a link to the tutorial for the same. The documentation provided is too difficult to understand. Is there a module that provides for this specific purpose like drag and drop two points and we get the distance in mm measured?

Thankd

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [February 5, 2018, 6:31am UTC](https://discourse.slicer.org/t/measurement-ruler-in-4-8/2020/2 "2018-02-05T06:31:26Z")

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Yes, there is a ruler tool to do exactly what you want to do:  
[https://www.slicer.org/wiki/Documentation/4.8/Modules/Annotations](https://www.slicer.org/wiki/Documentation/4.8/Modules/Annotations)

 ![](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/1X/677f06bdf711468707faf594c72c7993f90d2513.png)

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [April 12, 2019, 4:49pm UTC](https://discourse.slicer.org/t/measurement-ruler-in-4-8/2020/3 "2019-04-12T16:49:34Z")

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3 posts were split to a new topic: [Ruler measurement does not give the result that I expect](https://discourse.slicer.org/t/ruler-measurement-does-not-give-the-result-that-i-expect/6484)