Risk Warning: CFDs and forex trading involve significant risk of loss. Leveraged products can result in losses exceeding your deposit. This calculator is for educational purposes only and does not constitute financial advice.
Forex Margin Calculator
Calculate the margin required to open a forex position at any leverage level. Enter your position size in units and the base-to-account exchange rate to find the exact margin requirement in your account currency.
Formula
Margin formula
Margin = (Position Units × Base→Account Rate) ÷ Leverage
Base→Account Rate is the rate from the pair's base currency to your account currency.
EUR/USD · USD account → EUR/USD spot (e.g. 1.1050)
USD/JPY · USD account → 1.0 (base IS account currency)
GBP/JPY · USD account → GBP/USD rate (e.g. 1.27) — NOT the GBP/JPY rate
Worked Example
Given
100,000 units · 100:1 leverage · EUR/USD pair · USD account · EUR/USD = 1.1050
- Position Units
- 100,000 (1 standard lot)
- Base→Account Rate
- 1.1050 (EUR/USD, base=EUR, account=USD)
- Leverage
- 100:1
- Required Margin
- (100,000 × 1.1050) ÷ 100 = $1,105.00
Frequently Asked Questions
- What is margin in forex trading?
- Margin is the deposit your broker holds as collateral when you open a leveraged position. It is not a fee — it is a portion of your account equity reserved while the trade is open. For example, at 100:1 leverage, opening a 1-lot EUR/USD position (100,000 EUR) with a USD account at EUR/USD = 1.1050 requires $1,105 in margin.
- What is the Base → Account Rate and how do I find it?
- This is the exchange rate that converts 1 unit of the base currency (the first currency in a pair) into your account currency. For EUR/USD with a USD account: base=EUR, account=USD → enter the current EUR/USD rate (e.g. 1.1050). For USD/JPY with a USD account: base=USD, account=USD → enter 1.0. For GBP/JPY with a USD account: base=GBP, account=USD → enter the GBP/USD rate (e.g. 1.27).
- How is margin different from the position size?
- Position size is the full notional value of your trade (e.g. 100,000 units). Margin is a fraction of that notional value determined by your leverage ratio: Margin = (Position Units × Base→Account Rate) ÷ Leverage. With 100:1 leverage, your margin is 1% of the notional value. With 50:1 leverage, it is 2%.
- What happens if my free margin falls too low?
- Brokers issue a margin call when your account equity falls below the maintenance margin level (typically 50–100% of the required margin). If you do not deposit more funds or reduce your position, the broker may automatically close your trades — a stop-out. Always maintain a buffer of free margin to withstand normal price fluctuations.
- Does higher leverage mean higher margin requirements?
- No — higher leverage means lower margin requirements per lot. At 100:1 leverage, a 1-lot EUR/USD position requires ~$1,105 margin. At 50:1, the same position requires ~$2,210. Higher leverage reduces the capital tied up as margin, but amplifies both profits and losses relative to that margin.