[B]Thinking in terms of R[/B]
You’ve probably come across traders shouting out the hundreds of pips they made in a day or the 10% gain in a week. But if you ask me, all these are noise. Why?
Well, you could be risking 1000 pips and made 500 pips, a risk reward of 1 to 0.5.
Or you could risk 20% of your account on a trade and earn 10%, a risk reward of again 1 to 0.5
Statements like these are misleading simply because they are relative.
A more objective approach would be measuring profits in terms of R.
[B]So what is R?[/B]
I define R as your initial risk on each trade.
If you long a stock at $50 with SL at $45, then your initial risk is $5. Thus this $5 is 1 R. If you sold your stock at $60, you made $10. Thus a profit of 2R. (10/5=2)
Similarly, if you short a stock at $100 with SL at $120, then your initial risk is $20. Thus this $20 is 1R. If you cover back your stock at $50, you made $50. Thus a profit of 2.5R. (50/20=2.5)
Once you’ve understand R then you can move on to the next aspect of position sizing. Risking a fixed % of your capital per trade no matter how many pips your Stoploss is.
We want to maintain risking a constant % of our initial capital ® on each trade. No matter what the volatility of the instrument or the size of the Stoploss.
And this formula will do just that.
[B]Position Size = R / (Stoploss in pips * Pip Value)[/B]
Let’s assume I’m risking 1% a trade on a $10000 account, thus i can risk up to $100 per trade. So R is now $100.
Also i notice a potential long setup on Eurusd that requires 50 pips Stoploss.
50 pips * Position Size = $100
And each mini lot is worth $1
So what is my position size? Here we have position size = 2 which means we can risk $2 per pip. Which is equivalent to 2 mini lots of Eurusd.
Is that simple? Yes!
By now you’d realize the larger your Stoploss the smaller your position size keeping R constant.
And the smaller your Stoploss the larger your position size keeping R constant.
Thus no matter what contracts you trade or how their volatility differ from one another, this formula will keep your R in check.
Once again,
[B]Position Size = R / (Stoploss in pips * Pip Value)[/B]
Rayner