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Almost every blown account in retail forex traces back to one decision: risking too much per trade. The 2% rule fixes this in one line — never let a single losing trade cost more than 2% of total equity.
Why 2% and not 5%
The mathematics of losing streaks are unforgiving. A trader who risks 5% per trade and loses ten in a row is down 40% — and now needs a 67% gain just to recover. The same trader at 2% per trade is down ~18% and needs ~22% to recover. Survivability scales exponentially with how small your bets are relative to equity.
| Risk per trade | Equity after 10 losses | Gain needed to recover |
|---|---|---|
| 1% | ~90.4% | ~10.6% |
| 2% | ~81.7% | ~22.4% |
| 5% | ~59.9% | ~67.0% |
| 10% | ~34.9% | ~186% |
Calculating position size correctly
The formula every retail trader should burn into memory:
Position size = (Equity × Risk%) ÷ (Stop-loss in pips × Pip value)
Worked example
Account: $10,000. Risk: 2% = $200. Trade: EUR/USD with a 25-pip stop. Pip value on a standard lot: $10.
Position size = $200 ÷ (25 × $10) = 0.8 standard lots. Anything larger violates the rule.
When 2% is still too aggressive
Newer traders, correlated positions, news-driven sessions, and weekend-gap markets all argue for tighter risk. Many professional FX managers run at 0.5% per trade and let edge compound slowly.
The discipline test
If a setup looks so good you want to risk more than 2%, the setup is not better — your psychology is louder. Trade the rule, not the feeling.
