Delete a custom field in Salesforce

Delete a custom field in Salesforce

Setup | Object Manager | go to the object | Fields and Relationship tab | go to the field (which you want to delete) | in right hand side dropdown select delete (in lightning) (in classic, you will find a del link - you can click that) | please note, this don't permanently delete the field

Please note, it may stop you to delete if the field has reference (like the field is used in formula field etc.), remove this field from the references or  delete the reference then delete the field.

Salesforce starts to hard delete these fields after 15 days. The hard-delete process permanently removes all metadata and system data for the field. Erase skips the 15-day grace period, and immediately sets the field to ready for the hard-delete process. Undelete (if available) restores the field.

Visual: https://www.youtube.com/watch?v=HcGI7Ck_xto