# How calculate integral of history tag

**URL:** <https://forum.inductiveautomation.com/t/how-calculate-integral-of-history-tag/27741>\
**Category:** Ignition\
**Created:** [August 24, 2019, 7:16am UTC](https://forum.inductiveautomation.com/t/how-calculate-integral-of-history-tag/27741 "2019-08-24T07:16:17Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![JordanCClark](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jordancclark/32/83362_2.png) [@JordanCClark](https://forum.inductiveautomation.com/u/JordanCClark)\
**Post date:** [August 24, 2019, 11:24am UTC](https://forum.inductiveautomation.com/t/how-calculate-integral-of-history-tag/27741/2 "2019-08-24T11:24:38Z")

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Hi Chris,

Did you see this topic? (Note: The link in that post is dead. Use the one in the bottom post.)

> [@Chart Help](http://forum.inductiveautomation.com/t/chart-help/9303/2):
>
> Time for a paradigm shift. Dah-da-da-daahh! (Imagine Jeff Dunham’s “Melvin, the Superhero Guy”) wink First, a window to play with. [Integral\_2014-11-07\_1314.proj](https://us1.discourse-cdn.com/inductiveautomation/original/2X/a/ac01bdd388a88ed210b3220d8491a9f97cf49c59.proj) (41.8 KB) Ok, the best you’ll be able to do is an approximation. The only thing we have are a set of discrete data points. Strictly speaking, we have no idea what is happening between the points. Graphing these points will give us a straight line between each one. The more samples you have the finer the details, and the closer the a…

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