Forex Margin Calculator
Calculate exactly how much margin your next trade requires. Pick your currency pair, position size, and leverage to know upfront what your broker will lock as collateral. Covers forex, gold, indices, and crypto CFDs.
Results
Margin Required by Lot Type
| Lot Type | Units | Notional Value | Margin Required |
|---|
What is margin in forex trading?
Margin in forex trading is the deposit your broker locks as collateral to open a leveraged position. It is not a fee or a cost. Margin is your own money, held against the trade, and released back to your account when the position closes.
Margin lets you control a position much larger than your account balance. With 1:30 leverage (the standard UK retail limit), £100 of margin controls a £3,000 position. With 1:500 leverage (available on professional accounts), £100 controls £50,000. The forex margin calculator tells you exactly how much margin you need for any combination of pair, lot size, and leverage before you place the trade.
Used margin, free margin, and equity explained
Forex platforms display four related numbers that every trader needs to understand:
- Balance. The cash in your account when no trades are open. £10,000 balance means £10,000 sitting there.
- Equity. Balance plus or minus the floating profit and loss of any open trades. If you are £200 in profit on an open position, equity equals balance plus £200.
- Used margin. The total margin currently locked against open positions. This is the number the forex margin calculator returns for each trade you plan to open.
- Free margin. Equity minus used margin. This is how much margin you have left to open new trades or absorb losses on existing ones.
Free margin is the most important number after equity. When free margin drops to zero, you cannot open new positions, and existing positions are at immediate risk of being closed by the broker.
What is margin level?
Margin level is the percentage ratio of equity to used margin. The formula is:
Margin Level = (Equity ÷ Used Margin) × 100%
A margin level above 100% means your account has more equity than used margin. Most brokers issue a margin call when the level drops to 100%, and force-close trades (stop out) when it drops to 50% or lower. A healthy margin level for active trading is 1,000% or higher, which means you are using less than 10% of your equity as margin.
How does the forex margin calculator work?
The Forex Complex margin calculator returns the exact margin requirement for any trade in your account currency. It uses this formula:
Required Margin = (Trade Size × Contract Size) ÷ Leverage
For a 1.0 lot trade (100,000 units) on EUR/USD at 1:30 leverage with EUR/USD quoted at 1.0850:
Required Margin = (1.0 × 100,000 × 1.0850) ÷ 30 = $3,616.67 ≈ £2,860
The same trade at 1:500 leverage only requires $217 (about £171) in margin. The calculator pulls live exchange rates and converts to your account currency (GBP, USD, EUR, and so on) so the output is the exact amount your broker will lock.
How is margin calculated in forex?
Use The Forex Complex calculator in four steps:
- Select your account currency. Choose the currency your account is denominated in (GBP, USD, EUR, JPY). Margin will be returned in this currency.
- Choose the instrument. Major or minor forex pair, gold (XAU/USD), silver, indices (US30, NAS100, GER40), or crypto CFDs.
- Enter your position size. In lots (1.0 = standard, 0.1 = mini, 0.01 = micro) or units.
- Set your leverage. 1:30 for UK retail FCA accounts, 1:20 for indices, 1:5 to 1:10 for crypto, and higher tiers for professional or offshore accounts.
The output is your required margin in your account currency. Combine with the position size calculator to size the trade by risk first, then check margin to confirm the account can support it.
Margin requirement table by leverage tier
Required margin for a 1.0 standard lot of EUR/USD (notional value ~$108,500) at different leverage levels, in pounds:
| Leverage | Required margin per 1.0 lot EUR/USD | Margin as % of notional |
|---|---|---|
| 1:5 (crypto retail) | £17,150 | 20% |
| 1:10 (commodity retail) | £8,575 | 10% |
| 1:20 (indices retail) | £4,290 | 5% |
| 1:30 (FX major retail UK) | £2,860 | 3.33% |
| 1:100 | £860 | 1% |
| 1:200 | £430 | 0.5% |
| 1:500 (pro account) | £171 | 0.2% |
UK retail traders are capped at 1:30 on major FX pairs under FCA rules. Higher leverage tiers require professional client classification.
Turn Trading Calculations Into Real Trading Decisions
Use your calculated risk levels, position sizing, and technical analysis together with live forex trading signals and market commentary from The Forex Complex.
What is a margin call in forex?
A margin call in forex is a notification from your broker that your account equity has dropped close to or below the margin required to keep your open positions running. It is a warning that you need to add funds, close trades, or watch the broker close them for you.
Most brokers trigger a margin call when your margin level hits 100% (equity equals used margin). If the market keeps moving against you and your margin level drops to the stop-out level (typically 50%, sometimes 20% or 30% depending on the broker), the broker automatically closes positions, largest first, until the margin level recovers.
A margin call is not the same as a stop-out. The margin call is the warning. The stop-out is the automated liquidation. By the time you receive a margin call, you may have minutes or seconds to act before forced liquidation begins.
Margin requirements for gold, indices, and crypto
The same calculator works across asset classes, but the leverage and contract size differ. Here is how it applies to the most-traded non-FX instruments under UK FCA retail rules.
Gold (XAU/USD) margin
For gold, the UK retail leverage cap is 1:20, meaning margin equals 5% of the notional position value. A 1.0 lot of XAU/USD (100 ounces) at $2,000/oz has a notional value of $200,000, so required margin is roughly $10,000 (~£7,900) at 1:20. Professional accounts can access 1:200 or higher, dropping margin to a few hundred pounds per lot.
Indices (US30, NAS100) margin
Indices like US30 (Dow Jones) and NAS100 (Nasdaq 100) carry a UK retail leverage cap of 1:20. A 1 lot US30 position at 38,000 index value has a notional value of $38,000, so required margin is roughly $1,900 (~£1,500) at 1:20. The exact figure depends on broker contract specifications, so always confirm with the calculator using your broker’s contract size.
Crypto CFD margin
Crypto CFDs carry the strictest UK retail leverage cap at 1:2 (50% margin requirement). A £10,000 notional BTC CFD position requires £5,000 in margin. This is intentional, since crypto volatility can wipe out high-leverage accounts in a single candle. The calculator returns the exact figure when you select a crypto pair.
Why margin management is important in forex trading
Margin management is what keeps your account alive long enough for your trading edge to play out. Most retail accounts fail not from a single bad trade but from over-leveraged exposure that triggers a margin call at the worst possible time.
Three rules that protect your margin:
- Never use more than 20% of your equity as used margin. That keeps margin level at 500% or higher, which is comfortable space for normal market volatility.
- Calculate margin before every trade. Use The Forex Complex margin calculator alongside the leverage calculator so you know how much margin a new trade adds and how that affects your overall margin level.
- Watch correlated exposure. Three EUR-related trades open at the same time (EUR/USD, EUR/GBP, EUR/JPY) effectively triple your euro exposure even though the margin only counts once per position. A single EUR news event can trigger margin calls across all three.
The drawdown calculator and risk of ruin calculator show why disciplined margin use is the single most important factor in account survival.
Common mistakes traders make with forex margin
Five mistakes that put accounts at risk:
- Confusing margin with risk. Margin is the deposit locked against the trade. Risk is the amount you lose if the stop-loss hits. A £200 margin trade with no stop-loss can lose far more than £200. Set a stop-loss every time.
- Maxing out leverage to maximise position size. Just because 1:500 leverage lets you control £50,000 with £100, it does not mean you should. High leverage shrinks the buffer between equity and stop-out level, turning normal volatility into liquidation events.
- Ignoring margin requirements on cross pairs and exotics. Some brokers raise margin requirements on exotic pairs (e.g. USD/TRY, USD/ZAR) and during high-volatility events. Always check before opening.
- Treating used margin as gone money. Used margin is locked, not spent. It returns to your balance when the position closes. But while it is locked, it is not available to absorb losses on the trade itself, which is the root cause of most margin calls.
- Trading without knowing the stop-out level. Brokers vary widely. Some stop out at 50%, others at 30%, others at 20%. Trading without knowing the threshold means trading without knowing when forced liquidation begins.
Frequently asked questions
What is free margin in forex?
Free margin is the equity in your account that is not currently locked as used margin. The formula is Free Margin = Equity − Used Margin. Free margin is what you have available to open new positions or absorb losses on existing trades. When free margin drops to zero, you cannot open new positions, and a margin call typically follows.
What happens during a margin call in forex?
A margin call happens when your account equity drops close to the level of your used margin, usually at a margin level of 100%. The broker notifies you to add funds or close positions. If the market keeps moving against you and the margin level falls to the stop-out level (typically 50%), the broker automatically closes your largest losing positions to restore the ratio. You cannot prevent stop-out once it triggers.
What is a good margin level in forex trading?
A healthy margin level is above 500%, meaning you are using less than 20% of your equity as margin. Active scalpers and short-term traders often run 1,000% or higher to leave plenty of buffer for fast market moves. Anything below 200% is high-risk territory, and below 150% means a single losing trade can trigger a margin call.
How do I calculate margin with leverage?
The forex margin formula is Required Margin = (Trade Size × Contract Size) ÷ Leverage. For a 1.0 lot EUR/USD position (100,000 units) at 1:30 leverage with the pair at 1.0850, required margin is roughly $3,617 (~£2,860). The Forex Complex margin calculator runs this maths automatically and converts to your account currency at the live rate.
What is the difference between used margin and free margin?
Used margin is the amount currently locked against your open positions and unavailable to absorb losses or open new trades. Free margin is the rest of your equity, available for either purpose. As open trades move into profit, free margin rises; as they move into loss, free margin falls. When free margin reaches zero, a margin call is imminent.
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