How to velocity or estimate a requirement based on the number of sub tasks?

[Chiaki Oigo]

I'd like to track my team's velocity or estimate a requirement based on the number of sub tasks in JIRA. Looks like I can do it by the number of tasks but not sub tasks. Do you know any way to achieve this?
https://confluence.atlassian.com/jirasoftwarecloud/configuring-estimation-and-tracking-764478030.html

[Nic Brough -Adaptavist- · Accepted solution]

No, there's no way to do this.

Velocity is a measure of what you deliver compared to what you committed to doing, and it is not partial - you either deliver what you said, or you do not.  A sub-task is a part of an item you might deliver.  The progress through sub-tasks is irrelevant to velocity.

[Chiaki Oigo]

Hi Nic,

Thank you for your answering. I got it. Unfortunately, it's impossible..

Thanks.

[Nic Brough -Adaptavist-]

Yes, it's "impossible" because it is incorrect.