How to Calculate Margin in Forex
What is Margin in Forex?
Margin is not a fee or transaction cost; it's a security deposit that your broker holds to cover potential losses. In Hungary, retail forex brokers typically require margin as a percentage of the total trade size, determined by the leverage you choose. For example, with 1:30 leverage (the maximum allowed by ESMA for major pairs), you need 3.33% margin. So, to trade 1 lot of EUR/USD at 1.10, you need margin = (100,000 × 1.10) / 30 = 3,666.67 USD.
Margin Calculation Formula
The basic formula is: Margin = (Lot Size × Contract Size × Market Price) / Leverage. Always use the base currency (the first currency in the pair) for calculation. For example, if trading USD/JPY, the base is USD, so contract size is in USD. For cross pairs like EUR/GBP, calculate in the base currency (EUR) then convert to your account currency (USD).
Example for Hungary Traders
Suppose you open a 0.5 lot position on EUR/USD at 1.1200 with 1:30 leverage. Margin = (0.5 × 100,000 × 1.1200) / 30 = 1,866.67 USD. If your account balance is 5,000 USD, your used margin is 1,866.67 USD, leaving free margin of 3,133.33 USD. This free margin must cover any floating losses to avoid a margin call.
Used Margin vs Free Margin
Used margin is the total margin locked by all open positions. Free margin is the difference between your account equity (balance + floating P&L) and used margin. When free margin drops to zero, you get a margin call, and the broker may close positions. In Hungary, brokers often set margin call levels at 100% and stop out at 50% of required margin.