What is a leverage ratio in trading?
In one line: A leverage ratio, like 50:1, shows how much position size each dollar of your margin can control. 50:1 means $1 controls $50.
A simple example
At 50:1, $1 of Margin controls $50 of currency. To open a $10,000 position, you'd need $200 set aside.
Turn the ratio into a margin percentage by dividing 1 by it:
| Leverage ratio | Margin needed | $ margin for a $10,000 position |
|---|---|---|
| 50:1 | 2% | $200 |
| 20:1 | 5% | $500 |
| 10:1 | 10% | $1,000 |
| 2:1 | 50% | $5,000 |
The margin calculator does this for any size.
US limits
For US retail forex, the CFTC and NFA cap leverage at 50:1 on major pairs and 20:1 on others. Stock margin accounts usually allow about 2:1 overnight. Futures use set margin amounts instead of a ratio.
Why it matters
The ratio sets how much you can control. It doesn't set how much you should risk.
Two traders both use 50:1. One opens a $100,000 position (one standard Lot) on a $2,000 account. A 20-pip move against them is $200, or 10% of the account. The other opens $10,000 (one mini lot). The same move is $20, or 1%. Same ratio, very different risk. A math example, not a promise.
A common mistake
Thinking lower leverage = less risk, automatically. What matters is position size compared to your stop. A 2:1 stock position with no stop can lose far more than a 50:1 forex trade with a tight stop and small size.
Size from the stop first: risk about 1% of the account, stop from the chart, then size with the position size calculator. Check the margin after. It should be comfortably below what the ratio allows.
The full explanation is in leverage and margin explained, and the general idea in Leverage.
Questions
What does 1:100 leverage mean?
Each $1 of margin controls $100, so the margin is 1%. That's above the US retail forex cap of 50:1 on majors.
What leverage should a beginner use?
The ratio matters less than the size. Many beginners keep their effective leverage, total position ÷ account, low, often well under 10:1.
What is effective leverage?
Your total position size divided by your account balance. A $20,000 position on a $5,000 account is 4:1 effective leverage, whatever the maximum allowed is.
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