How can I find out which passwords are considered weak?

Hi, ealtenburg!

Welcome to Trend Micro Home Users Community.

You may use Trend Micro Password Manager's Password Doctor. Password Doctor will help you identify passwords that are too short or accounts that use the same password.

For more information, you may refer to this link below:

How to use Password Doctor (Password Manager)

Let us know if you have further questions.

- TM_Cathy

Or you can try "Kaspersky password checker". Google for it. I used it to check my password strength.