We're a little slow so doing an educational post. If you are not familiar with the Kelly Criterion, get familiar. It's a formula designed for gambling which maximizes return for an account size. It both maximizes gain, without crossing a threshhold where you can blow up. To use a calculator you need to keep rigorous statistics. I don't tend to on EW based trades, mainly because the skew is so heavy. However, when I try a new system, like my BB band approach, I test it with small amounts, then maximize later. My Oanda account for forex pumps the needed statistics out for me thankfully.
How many trades are successful (edge)
Average gain of the winning trades, vs. average loss of the losing (skew).
I found this handy dandy calculator online.
I've attached the image for the lasts 30 day performance using the BB squeeze method. It's a small account, $1400.
I have 1.23 Risk:Return ratio which I can plug into the calculator as 123% average to 100% return. Note the ratio is more important than the total. I didn't make any 123% trades. I can put in 4.92 to 4 for instance and it will calculate the same.
I have a 49% success rate.
I get a bet size of $106 per trade.
Note, if you get a negative number or 0, the calculator is telling you cannot trade profitably.
I have kept my Forex trades small, as I have not historically done well. However, if this proves out, I'll add to the account.