No, not exactly.
First, you choose an appropriate risk percentage, which determines the dollar-amount of your risk. In the previous example, the risk percentage is 1%, which corresponds to a risk amount of $480. This risk percentage is chosen without regard to where you will place your stop-loss.
Then you choose your entry price and your stop-loss. Your stop-loss is chosen without regard to the risk percentage which pertains to this trade. Let’s say your chosen stop-loss is 50 pips away from your entry price.
Finally, you set your stop-loss (in pips) equal to your risk amount (in dollars). In this case, 50 pips = $480. Therefore, in this trade, one pip (of profit or loss) is worth $9.60 (that is, $480 / 50 = $9.60). This pip-value will determine the position size of this trade.
Suppose you had chosen a stop-loss of 30 pips, instead. Then, one pip would be worth $16, and a different position size would be calculated.
In other words, the stop-loss you select will represent your risk, because you have equated it to your selected risk amount.
No, again.
In the example above, you have the same risk regardless of the stop-loss you subsequently choose. But, once you have specified your account currency, your account balance, the pair you want to trade, your chosen risk percentage, and your stop-loss – then you cannot also choose your position size. Instead, math will determine your position size, based on the other metrics you have chosen.
We could use the metrics in the example above to calculate the position size, by hand – but, let’s be lazy and use the Position Size Calculator, instead.
Let’s assume that the pair being traded is EUR/USD. We enter the following metrics into the Calculator:
- Account currency: USD
- Account balance: 48000
- Risk percentage: 1
- Stop-loss: 50
- Currency pair: EUR/USD
The result looks like this –
If your trading platform allows you to trade in micro-lot increments, then you can enter a 96-micro-lot position. If your platform allows trades in mini-lots, then you can enter a 9-mini-lot position without exceeding your predetermined risk. Etc.
As you will see, when you enter a different stop-loss in the Position Size Calculator, the risk amount does not change, but the position size does.
One final note: We didn’t have to enter the current price for the pair being traded (in this example), because the quote currency in the pair traded matched the account currency (both USD).
But, in any calculation in which the quote currency does not match the account currency, the Position Size Calculator will ask for the current price of the pair being traded. Change the pair to USD/JPY, for example, and see how this works.