Let’s calculate the maximum lot size you can use to avoid getting stopped out before your stop loss (SL) level, based on your provided information.
Assuming you have a $300 USD account balance with a leverage of 1:500, and your SL position is 50 pips below your entry point, we can determine the maximum lot size by trial and error.
SCENARIO 1:
Let’s try a lot size of 0.6, which is equivalent to 60,000 units.
The margin requirement for 0.6 lot size would be:
Margin requirement = 60,000 / 500 = $120 USD
This means $120 USD would be deducted from your $300 USD account balance and set aside as margin for opening a 0.6 lot size long position on EURUSD.
After deducting the margin requirement, you are left with $180 USD for drawdown. For a 0.6 lot size position, each pip movement has a value of $6 USD. Thus, with $180 USD available, you can withstand a drawdown of up to 30 pips ($180 / $6). However, this falls short of your desired 50-pip stop loss.
SCENARIO 2:
Let’s try a smaller lot size of 0.4.
The margin requirement for 0.4 lot size would be:
Margin requirement = 40,000 / 500 = $80 USD
This time, $80 USD would be deducted from your $300 USD account balance as margin for opening a 0.4 lot size long position on EURUSD.
After deducting the margin requirement, you are left with $220 USD for drawdown. For a 0.4 lot size position, each pip movement has a value of $4 USD.
Calculating the drawdown capacity:
Drawdown capacity = Available balance / Value per pip
Drawdown capacity = $220 USD / $4 USD per pip = 55 pips
Therefore, with an account balance of $220 USD and entering a 0.4 lot size long position on EURUSD, you can tolerate a drawdown of approximately 50 pips. However, keep in mind that opening a position often incurs a commission of roughly 1 pip, which amounts to $4 for a 0.4 lot size position.
In conclusion, I recommend entering a 0.4 lot size long position on EURUSD to ensure your $300 USD account balance can withstand a drawdown of around 50 pips, which is close to maximizing your margin requirement for facilitating a 50-pip drawdown.
I understand that your account is actually 300 Euros instead of 300 USD. Now that you know how to perform the calculation, you may convert your account balance to USD, which is roughly $327 base on current EURUSD exchange rate.