Quote from cabletrader:
Risk is calculated by taking a percentage of capital balance (ie 1%) and then dividing it by the stop loss for the trade, and from there calculating trade size, allowing some margin for unexpected slippage if required.
In your example, risk is 1%, it is not calculated. It is preset. Gosh...
Quote from cabletrader:
Leverage used never came into the equation, it's a meaningless 'by-product' number which serves no purpose, using some arbitrary number like you've done is misleading as can clearly be seen if you do the calculation I mentioned.
Account leverage and position size are of course related by the simple formula you should know before you blow up:
Leverage = Position size x contract face value /account size
= account risk x contract face value/stop loss
From this we get
Account risk = Leverage x stop-loss / contract face value
Now this is our difference:
For 25 pips stop loss (mini contract) and an account of $5,000 you calculate the position size for 1% risk as :
Position size = .01 x 5000/(25 x 1) = 2. Your leverage is equal to 4 (2 x 10K/5K).
In my case, for maximum leverage of 2, I calculate the position size follows:
Position size = 2 x 5000 /10000 = 1
So you trade 2 contracts and I trade 1. Suddenly, ECB starts selling Euros and there is a 100 pip gap down our long EURUSD position stop price. You lose 4% in a single trade and I lose 2%. After 8 such hypothetical losses , you are down 32% and I am down only 16%. If you are a fund or a fx pro trader, you are forced to liquidate everything because you are over cummulative stop loss of 30%. Extreme scenario some may call it but it seems it happens occasionally. Last year proved that 10 consecutive losers is not that impossible scenario.
Furthermore, the above callculation you suggested and I also used in my example for position sizing for illustarting the relation of leverage to risk is for naive and newbie traders. You should really visit a forex dealing room and ask to find out how traders calculate position size and risk. Nothing like the naive stuff you proposed. I worked in a dealing room. I will not reveal the calculations here but I can tell you one thing. It involves several parameters, like percent risk, cummulative risk allowance, past performance and market volatility.
Best.