Margin is one of the most important, and often misunderstood, concepts in trading.
If you’re trading with leverage, margin directly impacts how much exposure you take on. Without proper control, even small market movements can lead to significant losses.
In this guide, we break down how the Margin Rule works, why it matters, and how to stay within the limits so you can trade with more control and confidence.
What is Margin?
Margin is the collateral required to open and maintain a leveraged position.
Instead of paying the full value of a trade, you commit only a fraction of it. This allows you to control a larger position with less capital, but it also increases your exposure.
Think of it as a deposit that gives you access to bigger market opportunities.
Without margin, and leverage, trading instruments like Forex, indices, or commodities would require significantly more capital to generate meaningful returns.
How to Calculate Margin
The formula is straightforward:
Margin = (Lots × Contract Size × Price) / Leverage
Each component matters:
Lots - how much you trade
Contract size - value per lot
Price - current market price
Leverage - multiplier applied to your capital
The key takeaway: Margin is mainly influenced by your position size.
What is Margin Used (%)?
Margin used (%) shows how much of your account is tied up in a trade.
Formula:
(Margin Used / Account Balance) × 100
This is a critical metric because it reflects how much exposure you’re taking relative to your capital.
Using too much margin on a single idea increases the risk of rapid drawdowns, even from normal market volatility.
Important Margin Levels at TTP
At The Trading Pit, we highlight two key thresholds:
If you exceed 40% more than once, it becomes a rule breach.
The goal isn’t to limit your trading, it’s to help you manage exposure and avoid unnecessary risk.
What is a “Trade Idea”?
The Margin Rule applies per trade idea, not per individual trade.
A trade idea can be:
A single asset, for example multiple positions on Gold
A group of correlated instruments, for example EUR/USD and GBP/USD
All related positions are combined into one trade idea, even if:
They’re opened at different times
They have different sizes
They are split into multiple entries
Direction Matters
Correlation isn’t just about the asset, it’s also about market direction.
These are considered the same trade idea:
This is because both positions reflect the same market view, USD weakness.
But this is not the same trade idea:
Because the market view is different.
Margin vs Risk: Not the Same Thing
This is where many traders get confused.
They are completely separate.
Example
You can have:
Low margin but high risk, due to a wide stop loss
High margin but low risk, due to a tight stop loss
That means:
You can follow the margin used per trade idea rule but break risk per trade idea rule,Or follow risk per trade idea rule but violate the margin used per trade idea rule understanding this difference is key to managing your trades properly.
Why the Margin used per trade idea Rule Exists
The Margin used per trade idea Rule is there to protect your account from overexposure.
Without it:
One trade could consume too much capital
Small market moves could trigger large losses
Accounts become highly sensitive to volatility
In short, it helps you stay disciplined and avoid unnecessary drawdowns.
Learn More
If you want a deeper breakdown of how margin is calculated and applied, you can check out our FAQ here!
Watch the Full Explanation
Prefer a visual walkthrough?
Watch our “Margin used per trade idea Rule Explained in 7 Minutes” video to see real examples and scenarios in action.
Compliance with this rule must be maintained across all existing and future accounts and trading instruments.
This content is for educational purposes only and does not constitute financial advice.
