# Difference between usage between last month and this month

**URL:** <https://forum.adalo.com/t/difference-between-usage-between-last-month-and-this-month/41973>\
**Category:** Get Help\
**Created:** [September 12, 2023, 2:53pm UTC](https://forum.adalo.com/t/difference-between-usage-between-last-month-and-this-month/41973 "2023-09-12T14:53:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aves](https://avatars.discourse-cdn.com/v4/letter/a/bcef8e/32.png) [@aves](https://forum.adalo.com/u/aves)\
**Post date:** [September 12, 2023, 2:53pm UTC](https://forum.adalo.com/t/difference-between-usage-between-last-month-and-this-month/41973/1 "2023-09-12T14:53:53Z")

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I am creating an electricity usage management app. The collection consists of rooms No., Month, and Usage. What should I do if I want to calculate the usage amount from the comparison with the previous month for the same room?

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**Author:** ![system](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.adalo.com/system/32/40401_2.png) [@system](https://forum.adalo.com/u/system)\
**Post date:** [September 22, 2023, 2:54pm UTC](https://forum.adalo.com/t/difference-between-usage-between-last-month-and-this-month/41973/2 "2023-09-22T14:54:47Z")

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