I’ve got 1000 USD and a strategy that makes sense and has a good profit factor.

But how do I calculate best optimal fixed fraction % for it?

Clearly if I risk 1% or 2% per each trade, I am not going anywhere and equity is not utilized at its fullest potential… on the other hand if I trade let’s say risking 90% of equity on each trade, I am playing with fire and about to blow up my account, right?

So how do you calculate best MM FF% ?

What do you use for educated guess then?

One way you can think about it is to figure out the odds of long runs of consecutive losing trades and then figure out what risk level leaves you well able to survive them. And play it conservatively. You may think 1% odds of a run of 10 straight losses gives you a lot of wiggle room, but in reality if you trade actively enough you’re basically guaranteed of having a run that bad, if not worse.