Forex Margin Calculator
Calculate forex margin with our free Forex margin Calculator. Compare rates, see projections, and make informed financial decisions.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
Required Margin = (Lot Size × Contract Size × Exchange Rate) / Leverage
Calculate the notional value of your position by multiplying lot size by contract size (100,000 for standard forex, 100 for gold) and the current exchange rate. Divide by your leverage ratio to get the required margin. Free margin is your account balance minus used margin. Margin level is equity divided by used margin, expressed as a percentage.
Worked Examples
Example 1: Standard Lot EUR/USD with 1:100 Leverage
Problem:Calculate margin for 1 standard lot EUR/USD at 1.0850 with 1:100 leverage. Account: $10,000.
Solution:Notional value = 100,000 × 1.0850 = $108,500\nRequired margin = $108,500 / 100 = $1,085\nFree margin = $10,000 - $1,085 = $8,915\nMargin level = ($10,000 / $1,085) × 100 = 921.7%
Result:Margin: $1,085 | Free: $8,915 | Level: 921.7%
Example 2: Gold (XAU/USD) with High Leverage
Problem:Calculate margin for 0.5 lots XAU/USD at $2,035 with 1:200 leverage. Account: $5,000.
Solution:Notional value = 50 oz × $2,035 = $101,750\nRequired margin = $101,750 / 200 = $508.75\nFree margin = $5,000 - $508.75 = $4,491.25\nMargin level = ($5,000 / $508.75) × 100 = 982.8%
Result:Margin: $508.75 | Free: $4,491.25 | Level: 982.8%
Frequently Asked Questions
What is margin in forex trading?
Margin is the amount of money required in your account to open and maintain a leveraged trading position. It acts as a good-faith deposit, not a fee or transaction cost. For example, if you want to trade 1 standard lot (100,000 units) of EUR/USD with 1:100 leverage, you need 100,000 / 100 = $1,000 margin. The margin is locked by your broker while the position is open and returned when you close it (adjusted for profit or loss). Margin requirements vary by broker, instrument, and regulatory jurisdiction. Understanding margin is crucial because insufficient margin leads to margin calls and forced position closure.
How does leverage affect required margin?
Leverage and margin have an inverse relationship: higher leverage requires less margin for the same position size. With 1:50 leverage, you need 2% of the notional value as margin. With 1:100, you need 1%. With 1:500, you need just 0.2%. For a $100,000 position: at 1:50 you need $2,000 margin; at 1:100 you need $1,000; at 1:500 you need only $200. While higher leverage means you can open larger positions with less capital, it dramatically increases your risk. A 1% move against you with 1:500 leverage wipes out five times your margin. European regulators cap retail leverage at 1:30 for major forex pairs.
What is a margin call and how do I avoid one?
A margin call occurs when your account equity falls below the required margin level, typically at 100% margin level (where equity equals used margin). When triggered, you must either deposit more funds or close positions to free up margin. To avoid margin calls: never use more than 5-10% of your account as margin for all open positions combined, use appropriate lot sizes based on risk management (not maximum leverage), always set stop losses to limit drawdown, avoid holding multiple correlated positions simultaneously, and keep a healthy margin buffer. Most brokers have a stop-out level (often 50%) where they automatically close your positions to prevent further losses.
What is the difference between used margin and free margin?
Used margin is the total amount locked by your broker for all open positions. Free margin is the remaining equity available to open new positions or absorb floating losses. Free Margin = Account Equity - Used Margin. For example, with a $10,000 account and $2,000 used margin, your free margin is $8,000. If your open trades have a floating loss of $1,000, your equity drops to $9,000 and free margin becomes $7,000. Monitoring free margin is essential — when it approaches zero, you are close to a margin call. Professional traders typically keep their used margin below 20% of account equity.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy