How to Calculate Margin in Forex
What is Margin in Forex?
Margin is not a fee or a cost; it's a security deposit that your broker holds to cover potential losses. It allows you to control a large position with a relatively small amount of capital. For France traders, understanding margin is critical because the AMF enforces strict leverage limits to prevent excessive risk.
The Margin Formula
The basic formula is: Margin = (Trade Size × Current Price) / Leverage. Trade size is measured in lots (standard = 100,000 units; mini = 10,000; micro = 1,000). The current price is the exchange rate of the pair you are trading. Leverage is the multiplier provided by your broker.
Example for France Traders
Suppose you are a French retail trader with a USD-denominated account. You want to buy 1 standard lot (100,000 units) of EUR/USD at an exchange rate of 1.10. Your maximum leverage is 1:30. Margin = (100,000 × 1.10) / 30 = €3,666.67. Since your account is in USD, the broker converts this to USD at the current rate (e.g., 1.10 → $4,033.33). This is the amount that will be 'locked' as margin.
Used Margin vs Free Margin
Used Margin is the total margin required for all open positions. Free Margin is the difference between your account equity and used margin. If your equity drops below used margin, you get a margin call. In France, brokers must warn you when margin level (Equity/Used Margin × 100) falls below 100%.
Leverage Limits in France
Under ESMA rules enforced by the AMF, retail clients have the following maximum leverage: 1:30 for major forex pairs, 1:20 for minors, 1:10 for exotics, and 1:2 for cryptocurrencies. Professional clients can access higher leverage but must meet criteria like portfolio size and experience.