# Indirect Tag with calc

**URL:** <https://forum.inductiveautomation.com/t/indirect-tag-with-calc/15290>\
**Category:** General Discussion\
**Created:** [September 9, 2017, 12:21pm UTC](https://forum.inductiveautomation.com/t/indirect-tag-with-calc/15290 "2017-09-09T12:21:17Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![antoniosantos\_ccb](https://avatars.discourse-cdn.com/v4/letter/a/e0b2c6/32.png) [@antoniosantos\_ccb](https://forum.inductiveautomation.com/u/antoniosantos_ccb)\
**Post date:** [September 9, 2017, 12:21pm UTC](https://forum.inductiveautomation.com/t/indirect-tag-with-calc/15290/1 "2017-09-09T12:21:17Z")

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Hello.

I need to convert temperature and I am using indirect tag.  
Is it possible to convert using calc ? ((Tank {1}/Tb\_Temperatura)-30)/2  
What can I do to use indirect tag and show the tempurature converted?

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**Author:** ![Kevin.Collins](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.collins/32/13497_2.png) [@Kevin.Collins](https://forum.inductiveautomation.com/u/Kevin.Collins)\
**Post date:** [September 9, 2017, 7:35pm UTC](https://forum.inductiveautomation.com/t/indirect-tag-with-calc/15290/2 "2017-09-09T19:35:44Z")

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Have you considered using a [Derived Tag](https://docs.inductiveautomation.com:8443/display/DOC79/Types+of+Tags#TypesofTags-DerivedTags) for this? Might be a good option to explore.

 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/5/5a2e0ff204e6f59074ccee5c1c53fbf080c585a6.png)  
 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/2/23c56cb411ba385e915504f9ddac653152532938.png)  
 ![](https://us1.discourse-cdn.com/inductiveautomation/original/2X/8/8e1029857b50d535da6d7a5f7c7b629ad2a7761a.png)

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<div class="post-metadata">

**Author:** ![Kevin.Collins](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.collins/32/13497_2.png) [@Kevin.Collins](https://forum.inductiveautomation.com/u/Kevin.Collins)\
**Post date:** [September 9, 2017, 7:38pm UTC](https://forum.inductiveautomation.com/t/indirect-tag-with-calc/15290/3 "2017-09-09T19:38:03Z")

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You could also probably use an [Expression Tag](https://docs.inductiveautomation.com:8443/display/DOC79/Types+of+Tags#TypesofTags-ExpressionTags) and utilize the [tag](https://docs.inductiveautomation.com:8443/display/DOC79/tag) expression function to pull in the indirect value…