Direct answer
Free margin level in forex is a percentage that measures the relationship between your free margin and the margin currently used by your open positions. In plain terms, it describes how much account “cushion” you have relative to what your open trades require in margin.
Explanation: the core idea
To understand free margin level, it helps to separate a few related terms:
- Used margin: the portion of your account balance or equity that is reserved to support existing open positions.
- Free margin: the amount of margin not currently reserved for open positions.
- Free margin level: a ratio expressed as a percentage that combines the two values above.
A common way to express it is:
Free margin level (%) = (Free margin ÷ Used margin) × 100
When free margin is large compared with used margin, the ratio is higher. When free margin gets reduced—often because positions move against you and equity decreases—the ratio falls.
How it works in practice (and what you can check)
Free margin level changes as your account values change:
- If open trades move and affect equity, free margin changes accordingly.
- If you open additional positions or change leverage usage, used margin can change.
- As either numerator (free margin) or denominator (used margin) shifts, the percentage moves.
Independent checks you can do without needing real-time broker data:
- Identify your account’s current free margin and used margin values.
- Compute free margin level (%) using the formula above.
- If your platform shows a different number, verify whether it uses a variation (for example, different definitions for “margin” components) and confirm with your broker’s account calculation rules.
Relevant limitations and risks
Free margin level is a useful indicator, but it does not guarantee outcomes. Key limitations:
- Thresholds vary: many platforms have internal rules for actions like margin calls or forced position closures, and these rules differ by broker and account type.
- Not all “risk” is captured: free margin level reflects margin capacity, not the probability of future price movement.
- Calculation definitions may differ: some accounts may compute margin components using slightly different conventions, so treat the formula as a typical definition and confirm the exact method in your broker’s reporting.
Because the exact trigger levels and operational responses depend on broker policies, you should interpret free margin level as a margin-safety measure, not a universal “safe/unsafe” label.