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Forex Margin Calculator — Leverage and Required Margin
How required margin is calculated
Required Margin = (Lot Size × Contract Size × Price) ÷ Leverage Derived metrics: Free Margin = Equity − Required Margin Margin Level = (Equity ÷ Required Margin) × 100% Where: Lot Size = 1.0 standard, 0.1 mini, 0.01 micro Contract Size = 100,000 (FX), 100 (XAUUSD), 5,000 (XAGUSD), 1 (BTCUSD) Price = in account currency (apply FX conversion if needed) Leverage = 30 for 1:30, 100 for 1:100, 500 for 1:500
The position's notional value (lot size × contract size × price) is what the trader is actually controlling. Leverage determines what fraction of that notional must be locked as margin — at 1:30, you commit 1/30 of the notional. The remaining 29/30 is the broker's exposure to your performance. Free margin is the equity not currently locked in any position; it determines how many additional positions you can open. Margin Level — (equity / margin) × 100% — is the broker's health-check metric. At 100% margin level, equity exactly matches the required margin; any further loss triggers margin call. At 50% (or whatever the broker's specific stop-out level is) the broker force-closes positions until margin level is restored. For typical retail trading at 1:30 leverage and 1-2% per-trade risk, margin level rarely drops below 1000% — the constraint is risk, not margin.
Worked example
Inputs
- Currency pair: EUR/USD
- Lot size: 0.5 lots
- Current price: 1.085
- Leverage: 1:30
- Account equity: $10,000 USD
Calculation
- Compute notional value: 0.5 × 100,000 × 1.085 = $54,250.
- Apply leverage: $54,250 ÷ 30 = $1,808.33 required margin.
- Compute free margin: $10,000 − $1,808.33 = $8,191.67 available for other positions.
- Compute margin level: ($10,000 ÷ $1,808.33) × 100 = 553%.
- Verify health: margin level well above the typical 50% stop-out threshold — comfortable.
Result: $1,808.33 required margin · 553% margin level
Edge cases & special pairs
- JPY pairs price in account currencyUSDJPY price is in JPY but margin must be computed in account currency. For a USD account: required margin = (lot × 100,000 × 1) ÷ leverage = 0.5 × 100,000 ÷ 30 = $1,666.67. The base currency (USD) is what's used for margin, not the quote. For cross JPY pairs (EURJPY), use the EURJPY rate × USDJPY rate inverse.
- XAUUSD marginRequired margin = lot × 100 × price ÷ leverage. At gold $2,400 with 1:20 leverage and 0.1 lot: 0.1 × 100 × 2,400 ÷ 20 = $1,200. Note the much higher margin per lot than FX — gold's $2,400 price vs EURUSD's 1.085 creates a 2,400× difference in notional per contract unit.
- Leverage caps by regionEU/UK retail: max 1:30 on majors, 1:20 on minor FX, 1:20 on gold, 1:10 on indices, 1:2 on crypto. US (CFTC): max 1:50 on majors, 1:20 on others. Australia (ASIC): max 1:30 across instruments. Pro accounts: 1:100-1:500 depending on jurisdiction. Offshore: often 1:1000+.
- Dynamic leverage by tierSome brokers apply tiered leverage — first $50,000 notional at 1:500, next $50,000 at 1:200, beyond $100,000 at 1:100. Position sizes that span tiers get a weighted-average margin requirement. Most retail traders stay within tier 1; check the broker's specifications page for cutoff levels.
- Hedging account marginOn hedging accounts, you can hold both long and short positions simultaneously. Some brokers charge separate margin for each leg; others apply 'netting hedge' rules where opposing positions reduce total margin. MT5 reports the effective margin under Trade → Margin column.
- Margin call vs stop-out levelsMargin call (warning) and stop-out (force-close) are different. Common levels: margin call at 100% margin level, stop-out at 50%. Some brokers stop-out at 30% (more permissive — gives trade more room) or 80% (more conservative — closes earlier). Check your broker's terms before sizing large positions.
- Crypto margin requirementsCrypto CFDs have aggressive margin requirements: 1:2 to 1:5 leverage typical on regulated brokers. A 1.0 lot BTCUSD at $65,000 with 1:5 leverage requires $13,000 margin. Plan capital accordingly; crypto positions consume far more margin per dollar of notional than FX.
When to use this calculator
Use this calculator in three contexts. (1) Pre-trade sanity check: confirm the trade won't exhaust your margin before it has room to move. (2) Multi-position planning: if running 5 EAs simultaneously, compute combined margin requirement and confirm sufficient free margin headroom for all positions plus buffer for adverse moves. (3) Leverage selection: brokers often offer multiple leverage tiers (1:30, 1:100, 1:500) — the calculator shows how each impacts your free margin headroom. Important: higher leverage does NOT increase risk per trade if position size is held constant via fixed-fractional sizing. It only changes how much equity is locked in margin vs free for other positions. Many retail traders confuse leverage with risk; they're independent dimensions.
Related guide: How to choose a broker (leverage policy section) →
Frequently asked questions
Does higher leverage mean higher risk?
Mathematical proof: lot size × pip value × stop pips = risk amount. None of these terms include leverage. Leverage only determines required margin, which constrains how many positions you can hold simultaneously. The 'leverage = risk' myth comes from undisciplined position sizing — a trader at 1:500 may open 10 lots because they CAN (margin allows it), but the right discipline is to open the same 0.1 lots that 1% risk math dictates regardless of leverage.
Will my broker really force-close my positions at stop-out?
Stop-out happens at the broker's tick-rate, which can be milliseconds. By the time you see the stop-out alert, positions are already closed. The forced closure is typically at the worst available price during the fast move — slippage 5-20x normal. For accounts approaching stop-out, the right action is to manually close some positions yourself BEFORE the broker does, locking in losses at orderly prices. Never let stop-out happen if you can avoid it.
Can my account go negative due to margin issues?
Specifically: ESMA / FCA / ASIC require negative balance protection. CFTC does not explicitly require it but most US brokers offer it. Offshore (SVG, Vanuatu) brokers typically don't provide it — if your account goes negative, you owe the difference. The CHF 2015 event saw retail traders facing $50,000+ negative balances from $5,000 starting accounts when stops weren't filled due to liquidity vacuum. Always verify negative balance protection is enabled on your account.
How does margin work on Cent accounts?
The trade-off: Cent account spreads are usually wider than Standard ECN accounts (because Cent accounts are aimed at beginners, brokers profit on spread rather than commission). For a serious EA test, run on Cent for 30 days first (validates execution), then graduate to Standard ECN for live trading. The math is identical; only the scale differs.
Do I need 1:500 leverage to trade forex?
Concrete example: $500 account, 1% per-trade risk, 40-pip stop EURUSD. Required position: 0.125 lots, rounded to 0.12. Required margin at 1:30: 0.12 × 100,000 × 1.085 / 30 = $434. Free margin: $500 − $434 = $66. Tight but workable. At 1:500: required margin $26, free margin $474. Much more comfortable. So for sub-$500 accounts, 1:100-1:500 helps. Above $1,000, 1:30 is plenty.
Does margin accumulate when I open multiple positions?
MT5's Trade tab shows total margin in use across all open positions. For multi-EA setups, sum the per-position margins and ensure total margin stays well below your equity. A common rule: keep total margin under 30% of equity so margin level remains above 333% — gives substantial buffer for adverse moves before any margin call concerns.