# Calculating the distance between two points

**URL:** <https://discourse.slicer.org/t/calculating-the-distance-between-two-points/4033>\
**Category:** Support\
**Created:** [September 9, 2018, 6:44am UTC](https://discourse.slicer.org/t/calculating-the-distance-between-two-points/4033 "2018-09-09T06:44:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aseman](https://avatars.discourse-cdn.com/v4/letter/a/c0e974/32.png) [@aseman](https://discourse.slicer.org/u/aseman)\
**Post date:** [September 9, 2018, 6:44am UTC](https://discourse.slicer.org/t/calculating-the-distance-between-two-points/4033/1 "2018-09-09T06:44:05Z")

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Operating system:windows 10  
Slicer version:4.8.1  
Hi 3D slicer experts  
I want to calculate the distance between two points A and B in following figure. Which module should I use to do this?  
Thanks a lot  
 ![Picture](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/d/8/d821f2baaa440181895b7dd81560843ae0aef5fe.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:** [September 9, 2018, 12:09pm UTC](https://discourse.slicer.org/t/calculating-the-distance-between-two-points/4033/2 "2018-09-09T12:09:51Z")

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You can use [ruler](https://www.slicer.org/wiki/Documentation/Nightly/Modules/Annotations) tool to measure distance in an image.