Transaction log for standalone DB vs AlwaysON availability Group
For a high transaction active DB what is the ratio of log generation if it is a standalone DB and when it is part of SQL Alwayson availability group(synchronous commit).


Assuming Full Recovery mode, which AGs require, 1:1.  AGs don't require any additional logging beyond what a Full Recovery database already does.

In Simple recovery mode you might have some minimally logged operations, but for a "high transaction active" database, it's unlikely.  See eg

SQL Server 2016, Minimal logging and Impact of the Batchsize in bulk load operations