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When you open a forex trading account, your platform may display several numbers that look similar but serve different purposes. Two of the most important are free margin and used margin. If you do not understand the difference, you could open too many positions, underestimate your exposure, or discover that your account has very little room to absorb a losing trade.
For beginners, the confusing part is that money allocated as margin is not the same as money lost on a trade. Used margin is generally the amount reserved to support open positions, while free margin reflects the remaining equity available after that requirement. Both figures can change as your trades move into profit or loss.
In this guide, I will explain how these figures work, how to calculate them, and why monitoring them matters. The examples are educational illustrations, not trading recommendations or promises of profit.
What Is Used Margin in Forex?
Used margin is the amount of money your broker requires to maintain your open trading positions. Think of it as collateral allocated to support positions taken with leverage. It is not normally a separate fee that disappears when a trade opens, although trading costs and losses can reduce your account equity.
The amount required depends on factors such as position size, the instrument, the applicable margin rate, leverage, account currency, and the broker's rules. A larger position will generally require more margin than a smaller position under otherwise similar conditions.
For example, suppose a broker requires 2% margin for a position with a notional value of $10,000. The basic margin requirement would be $200. This is a simplified illustration: actual calculations can also depend on conversion rates, contract specifications, and instrument-specific rules.
Once you open the position, the required amount is reflected in your used margin. If you open another position, the platform may increase the total used margin. The exact treatment of hedged positions and offsetting trades varies by broker and account type.
What Is Free Margin in Forex?
Free margin is the portion of your account equity that remains after subtracting used margin. It helps show how much equity is not currently allocated to support open positions.
The standard formula is:
Free Margin = Equity − Used Margin
Free margin can be used as part of the broker's calculation when deciding whether you have enough margin to open another trade. However, having enough free margin does not mean that a new trade is sensible or that your account is adequately protected from losses.
Free margin changes as your open trades develop. If a position moves into profit, equity may increase and free margin may rise. If the position moves into loss, equity may fall and free margin may shrink. Spreads, commissions, swaps, and other account charges can also affect equity.
For a beginner, the key lesson is simple: free margin is not a target to use up. Leaving unused margin can provide flexibility, but it does not remove the risk created by your total market exposure.
Free Margin vs Used Margin: Key Differences
- Used margin: The amount currently required to support open positions.
- Free margin: Equity remaining after used margin is deducted.
- Main purpose: Used margin reflects allocated collateral; free margin helps indicate remaining margin capacity.
- Effect of losses: Floating losses usually reduce equity and therefore reduce free margin, while used margin may remain unchanged or change according to broker rules.
- Effect of new trades: Opening another position can increase used margin and reduce free margin.
These figures should be read together with balance, equity, and margin level. Looking at only one number can create a misleading impression of your account's condition.
Understand Balance, Equity, and Margin Level
To understand free and used margin properly, you need three additional terms.
Balance is generally the account value after deposits, withdrawals, and the profit or loss from closed trades have been recorded. It does not normally include the unrealised profit or loss of open positions.
Equity reflects the current account value after unrealised profit or loss is taken into account. A common simplified formula is:
Equity = Balance + Floating Profit or Loss
Margin level compares equity with used margin and is usually displayed as a percentage. Its common formula is:
Margin Level = (Equity ÷ Used Margin) × 100%
If there is no used margin because no positions are open, the platform may display margin level as zero, blank, or another platform-specific value. Check your broker's documentation for its exact display conventions.
A falling margin level can be a warning that floating losses are reducing the equity supporting your positions. The broker's margin-call and stop-out rules determine what happens if the account deteriorates further.
A Simple Free Margin Calculation Example
Imagine that a trader has a $1,000 account balance and one open position. For this simplified example, assume the position requires $200 in used margin and currently has no floating profit or loss.
- Balance: $1,000
- Floating profit or loss: $0
- Equity: $1,000
- Used margin: $200
- Free margin: $1,000 − $200 = $800
- Margin level: ($1,000 ÷ $200) × 100 = 500%
Now suppose the open position develops a floating loss of $300, while used margin remains at $200 for this example. Equity falls to $700. Free margin becomes $500, and margin level drops to 350%.
The used margin did not have to increase for free margin to fall. The decline occurred because the floating loss reduced equity. This is why checking your account only when you open a trade is not enough.
Real trading platforms may show slightly different figures because of spreads, commissions, currency conversion, contract specifications, or changing margin requirements. Always use the values and rules applicable to your own account.
How Leverage Affects Used and Free Margin
Leverage allows a trader to control a position larger than the funds required as margin. For example, under a simplified 1:50 leverage arrangement, a $10,000 notional position could require $200 in margin if the full position is eligible for that leverage and the margin rate is 2%.
Higher leverage can reduce the initial margin required for a given position, but it does not reduce the financial exposure of that position. A relatively small market move can still produce a significant profit or loss compared with the account's equity.
This distinction is important: margin is not the same as maximum possible loss. The required margin may be $200, but the position's loss can be larger than $200, depending on the market movement, account protections, and execution conditions.
Do not select a position size merely because the platform allows it. Decide how much you can afford to risk, identify where the trade idea becomes invalid, and calculate the position size from that risk. You can review the position size calculator to help estimate trade exposure before entering.
What Happens When Free Margin Becomes Low?
When floating losses reduce equity, free margin and margin level can decline. If the account reaches a broker-defined threshold, the platform may restrict new positions, issue a margin warning, or begin closing open trades. The exact process depends on the broker, account type, instrument, and applicable regulations.
A margin call is a broker-defined warning or requirement associated with insufficient margin. It does not always mean the broker will immediately close every trade. Some brokers may notify the trader, restrict new positions, or apply other procedures according to their terms.
A stop-out is a threshold at which the broker may automatically close one or more open positions. The purpose is to respond to insufficient account equity relative to the margin required, but forced liquidation can happen at unfavourable prices, particularly in fast markets.
Do not assume every broker uses the same margin-call percentage or stop-out level. Read the account agreement and margin policy before trading. The risk management guide is also useful when building rules for position sizing, exposure, and loss limits.
Common Margin Mistakes Beginners Should Avoid
1. Using all available free margin: Having enough margin to open a position is not evidence that the position is suitable. Adding trades can concentrate risk and leave less room for adverse price movement.
2. Confusing margin with risk: A small margin requirement does not mean a trade has a small potential loss. Evaluate the notional exposure, stop-loss distance, pip value, and possible execution slippage.
3. Ignoring floating losses: A balance figure may look unchanged while equity and free margin are falling. Monitor equity and margin level when positions are open.
4. Assuming stop-losses eliminate every risk: Stop-loss orders can help define an exit plan, but gaps and slippage may result in execution away from the requested level.
5. Forgetting trading costs: Spreads, commissions, and overnight financing may affect the account's equity. Understand the costs before holding positions for extended periods.
6. Ignoring broker rules: Margin requirements, leverage limits, margin calls, and stop-out policies differ. Confirm the terms that apply to your own account rather than relying on examples from another broker.
Practical Ways to Monitor Margin More Carefully
Before opening a trade, check the required margin and calculate the planned loss if the stop-loss is reached. Review your total exposure across all open positions, particularly if several trades are correlated or depend on the same currency moving in one direction.
During the trade, monitor equity, free margin, and margin level rather than relying only on balance. If free margin is declining, review whether floating losses, increased exposure, or changing margin requirements are responsible. Avoid adding positions simply to recover a loss.
Keep a written risk plan that includes position-size limits, maximum acceptable losses, and conditions for stopping trading. Your plan should be based on your financial circumstances and ability to tolerate losses, not on a desire to use every available unit of margin.
For further practice, use the pip calculator to understand how price movements translate into potential profit or loss. Calculators are learning aids; verify contract specifications and results with your broker's platform.
Final Thoughts
Free margin and used margin describe different parts of your forex account. Used margin represents the amount required to support open positions, while free margin is the equity left after that requirement is deducted. Equity changes with floating profit and loss, which means free margin can rise or fall even if used margin stays the same.
My main advice for beginners is to understand these numbers before increasing position size or opening additional trades. Margin availability is not a measure of trading quality, and a high margin level does not guarantee that a strategy is safe or profitable. Careful position sizing, regular account monitoring, and a clear understanding of broker rules are essential parts of responsible trading.
Frequently Asked Questions
1. What is the main difference between free margin and used margin?
Used margin is the amount required to support open positions. Free margin is equity minus used margin and indicates the equity not currently allocated to that requirement. Both figures can change as account equity and open positions change.
2. Can free margin become negative in forex trading?
Depending on market conditions, broker rules, and account protections, equity can fall below the used margin and the displayed free margin may become negative. Brokers may restrict trading or close positions under their margin policy. Do not rely on liquidation rules to control your risk.
3. Does high free margin mean a forex trade is safe?
No. Free margin indicates remaining equity after used margin, not the maximum potential loss or quality of a trade. Position size, total exposure, volatility, execution costs, and your stop-loss plan still matter. A high free-margin figure cannot guarantee protection from losses.
