# Add form calculations

**URL:** https://community.glideapps.com/t/add-form-calculations/76824
**Category:** Ask for Help
**Created:** [October 3, 2024, 10:13pm UTC](https://community.glideapps.com/t/add-form-calculations/76824 "2024-10-03T22:13:49Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)
#### Post date: [October 4, 2024, 1:27am UTC](https://community.glideapps.com/t/add-form-calculations/76824/2 "2024-10-04T01:27:49Z")

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I think the way to go is something like this:

- Use a custom form to add your Usage.

> [@How do I create a custom form?](https://community.glideapps.com/t/how-do-i-create-a-custom-form/25014/126):
>
> Exactly which App did you try? My original concept App doesn’t have any categories.

- When the user enters the product, you do a lookup to retrieve your unit for that product.
- Allow users to entere their own quantity with their own unit, and then convert to your standard unit using this column.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/e/0/e0f6ab4cd6e63d1ee3d7ab72fcdc93abac5ca042.png)

- Record the new row using your standard unit, but also store the user’s original quantity and unit for displaying purposes.

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_[View the full topic](https://community.glideapps.com/t/add-form-calculations/76824)._