Board Thread:Questions and Answers/@comment-25356210-20160710221950/@comment-26863727-20160711144507

It can vary heavily. The Galactic Empire had uncountable numbers of standard troopers(not stormtroopers) and tens of thousands of ships, not counting fighters. On the flipside, the United Federation of Planets formed a fleet of 30 ships in TNG and it was the largest in their history.