Quick Answer
Required forex margin is calculated as Margin = (Lot Size × Contract Size × Current Price) ÷ Leverage, for example, a standard lot with 1:100 leverage at a price of 1.1000 requires $1,100 in margin.
What Is Forex Margin?
Margin in forex trading is the amount of money a broker requires you to set aside (lock up) in your account to open and maintain a leveraged position. It is not a fee or a cost, it's collateral that's returned to you when you close the trade (assuming the trade hasn't lost more than your account can cover).
Leverage and margin are inversely related: higher leverage means a smaller margin requirement for the same position size, since leverage is essentially borrowed buying power from the broker. For example, with 1:500 leverage, the same position requires five times less margin than with 1:100 leverage, but the risk per pip moved remains the same regardless of leverage, since leverage only affects margin required, not actual profit/loss.
Running out of usable margin, when losses approach the amount of margin locked up, triggers a margin call or automatic position closure (stop-out) by the broker, which is why monitoring margin level (equity divided by used margin) is critical for any leveraged trader.
How to Use
- 1Enter the lot size of your intended position.
- 2Select the currency pair (this determines the contract size and current price used).
- 3Enter the leverage ratio offered by your broker.
- 4The calculator returns the exact margin required to open the position.
Formula
Margin = (Lot Size × Contract Size × Price) ÷ LeverageStandard lot contract size = 100,000 units of base currency
Example: 1 standard lot of EUR/USD at 1.1000, with 1:100 leverage
- Lot Size = 1 (100,000 units), Price = 1.1000, Leverage = 100
- Margin = (1 × 100,000 × 1.1000) ÷ 100
- Margin = 110,000 ÷ 100
Tips & Things to Know
- Higher leverage reduces the margin needed to open a position, but it does NOT reduce your actual risk per pip, a larger position still loses the same dollar amount per pip regardless of leverage used.
- Always monitor your margin level, not just your account balance, a margin call happens when your equity falls too close to your used margin, which can happen even with a positive account balance if losses are large relative to margin.
- Different brokers and account types may offer different maximum leverage, and some jurisdictions cap maximum retail leverage by regulation (e.g. many regulators limit major pairs to 1:30 or 1:50 for retail traders).
- Margin requirements can increase during high-volatility events (major news releases, weekends) as brokers adjust risk parameters, check your broker's specific policy.