Forex Margin Calculator — Required Margin by Leverage & Lot Size
Calculate the exact margin required to open any trade based on instrument, leverage, lot size, and live price. Supports 76+ instruments across forex, metals, crypto, indices, and commodities. Non-USD account currencies are converted automatically using live TradingView rates.
What Is Margin in Forex Trading?
Margin is the amount of money your broker requires you to deposit as collateral to open and maintain a leveraged position. It is not a cost or a fee — it is a security deposit that is returned to you when the trade is closed. Understanding margin is the most fundamental skill in leveraged trading: running low on free margin is the single most common cause of forced position closures and blown accounts, even among traders with profitable strategies.
The required margin formula used by every broker is:
The result is expressed in the instrument's quote currency. If your account currency is different (e.g. EUR account trading GBP/USD), the calculator automatically converts the margin using the live exchange rate between the quote currency and your account currency.
1 lot at 1.1000, 1:100 leverage.
(100,000 × 1 × 1.1000) ÷ 100 = $1,100 required margin.
1 lot at 1.2700, 1:100 leverage, EUR account.
Margin in USD = $1,270. Converted at live USD/EUR rate = ≈€1,154. This calculator handles it automatically.
Margin by Leverage Comparison Tool
Enter your trade details to instantly see how much margin each leverage level locks up — and how much free margin remains from your account balance. Values update in real time.
| Leverage | Margin % | Required Margin | Free Margin | Margin Level | Risk Assessment |
|---|---|---|---|---|---|
| 1:10 | 10.00% | $10850.00 | ⚠ Insufficient | 46% | Conservative |
| 1:30 | 3.33% | $3616.67 | $1383.33 | 138% | Conservative |
| 1:50 | 2.00% | $2170.00 | $2830.00 | 230% | Moderate |
| 1:100 | 1.00% | $1085.00 | $3915.00 | 461% | Moderate |
| 1:200 | 0.50% | $542.50 | $4457.50 | 922% | High Risk |
| 1:500 | 0.20% | $217.00 | $4783.00 | 2304% | High Risk |
Maximum Lot Size from Account Balance
Enter your account balance, leverage, entry price, and contract size to see the absolute maximum lots you can open — and the recommended safe limits. Adjust any field to see results update instantly.
Never trade at full margin. Any adverse move triggers an instant margin call.
Leaves 50% free margin as buffer. Suitable for experienced traders with tight stops.
Leaves 80% free margin. Recommended for beginners and all prop firm challenges.
Used Margin, Free Margin & Margin Level — What Each Number Means
Your trading platform shows four margin-related numbers at all times. Most traders focus only on the balance — ignoring free margin and margin level until it is too late. Here is what each figure means and why it matters.
The total margin locked across all currently open positions. You cannot use this capital for new trades until those positions are closed. This calculator shows the used margin per individual trade.
Equity minus used margin. This is your available capital for opening new positions and absorbing floating losses. When free margin approaches zero, any adverse price move can trigger a margin call — even if your balance is positive.
Equity ÷ Used Margin × 100%. Most brokers issue a margin call at 100% and trigger automatic stop-outs at 50%. Professional traders aim to maintain margin level above 500% at all times to provide adequate buffer.
Margin Guide — How Forex Margin Actually Works in Practice
Understanding the formula is the easy part. Managing margin effectively across multiple open positions, across different instruments, with changing market conditions is where most retail traders struggle. Here is a practical guide to the decisions that matter.
High-leverage (1:500) is appropriate only for major forex pairs with tight spreads. For volatile instruments like crypto, indices, or exotic pairs, use lower leverage (1:10–1:30) even if your broker allows more. Volatility can consume free margin faster than you can react.
Professional traders rarely use more than 20–30% of available margin at any one time. Using 80%+ leaves almost no buffer for floating losses. A single 1% adverse move can trigger a margin call when margin usage is too high.
Each open position consumes used margin simultaneously. If you have three positions open, the used margin displayed in your platform is their sum. The Maximum Lot Size tool above assumes no other positions — always adjust for your current exposure.
Some brokers increase margin requirements during weekends and overnight sessions to account for gap risk. Always check your broker's margin schedule if you plan to hold positions through a session close, especially around major economic events.
Required Margin by Leverage — EUR/USD, 1 Standard Lot at 1.1000
The table below shows how dramatically required margin changes with leverage using EUR/USD as a reference. Higher leverage reduces the margin required — but does not reduce your actual pip value or dollar risk per price move. It simply means you can open larger positions with less capital, at the cost of much less buffer before a margin call.
| Leverage | Margin % | Required Margin (1 lot) | Typical Account Type | Assessment |
|---|---|---|---|---|
| 1:10 | 10% | $11,000 | Institutional / ultra-conservative | Very Safe |
| 1:30 | 3.33% | $3,667 | EU/UK regulated retail (ESMA cap) | Regulated |
| 1:50 | 2% | $2,200 | US regulated retail (NFA/CFTC) | Safe |
| 1:100 | 1% | $1,100 | Standard offshore retail | Moderate |
| 1:200 | 0.5% | $550 | High-leverage offshore broker | High Risk |
| 1:500 | 0.2% | $220 | Maximum offshore leverage | Dangerous |
* Based on EUR/USD at 1.1000 with 100,000 unit contract size. Use the calculator above for any instrument, leverage, and account currency combination.
Margin in Prop Firm Context — FTMO, The5ers & Funded Next
Prop firms use a fundamentally different margin model from retail brokers. Rather than a traditional margin call based on equity falling below used margin, prop firms impose daily loss limits and maximum drawdown rules that are far more restrictive and are enforced automatically by their risk desk software. Understanding this distinction is critical before trading any funded account.
Related Trading Tools
Margin calculation is one step in a complete pre-trade risk workflow. Use these tools together to ensure every trade is correctly sized before you enter the market.
Calculate the exact lot size for any trade based on account balance, stop loss price, and risk percentage — across 70+ instruments.
Model the statistical probability of blowing your account over 100,000 Monte Carlo simulations based on win rate, R:R, and position size.
Calculate the exact dollar value of one pip for any instrument and lot size — essential for accurate stop loss placement.