# Storage calculator spreadsheet

**URL:** <https://forum.inductiveautomation.com/t/storage-calculator-spreadsheet/69702>\
**Category:** Ignition\
**Created:** [February 10, 2023, 4:22pm UTC](https://forum.inductiveautomation.com/t/storage-calculator-spreadsheet/69702 "2023-02-10T16:22:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![eddie\_johnson](https://avatars.discourse-cdn.com/v4/letter/e/57b2e6/32.png) [@eddie\_johnson](https://forum.inductiveautomation.com/u/eddie_johnson)\
**Post date:** [February 10, 2023, 4:22pm UTC](https://forum.inductiveautomation.com/t/storage-calculator-spreadsheet/69702/1 "2023-02-10T16:22:11Z")

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Looking for a storage calculator spreadsheet for the Ignition Historian.

TIA

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**Author:** ![andrews](https://avatars.discourse-cdn.com/v4/letter/a/898d66/32.png) [@andrews](https://forum.inductiveautomation.com/u/andrews)\
**Post date:** [February 12, 2023, 4:26am UTC](https://forum.inductiveautomation.com/t/storage-calculator-spreadsheet/69702/2 "2023-02-12T04:26:53Z")

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See this post:

> [@Disk Space Calculation](https://forum.inductiveautomation.com/t/disk-space-calculation/4972/2):
>
> Determining the size of your database really does vary depending on your setup. There are a lot of variables to take into account. Our historian logs data by exception and has the ability to compress the data. So if a value hasn’t changed in 10 days nothing gets logged. So, there are 3 varibles to look at: Number of tags Rate of change - % of tags that change every scan cycle Compression - how the historian compresses the data We try our best to keep the size of the database to a minimum. S…