# Storage calculator spreadsheet **URL:** \ **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:** 1\ **Showing post:** 2
**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")
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… --- _[View the full topic](https://forum.inductiveautomation.com/t/storage-calculator-spreadsheet/69702)._