[MickMason]

For simplicity I found it's easier to forget about margin and leverage.....

Your account is $1000
Your maximum risk is 2% ($20)
Your stop loss is 50pips
Divide $20 by 50pips = 40 cents per pip
Trade size 4k

Another example...

Your account is $1000
Your maximum risk is 2% ($20)
Your stop loss is 30pips
Divide $20 by 30pips = 66 cents per pip
Trade size 6.6k


Hope that helps


Mick