The 1% Rule for Prop Firms: Why It Works and How to Apply It
The 1% rule is the single most important risk management principle in prop firm trading. Here is why it works and how to apply it.
What Is the 1% Rule?
The 1% rule states: never risk more than 1% of your account balance on any single trade.
For a $100K account, that is $1,000 maximum risk per trade.
Why It Matters for Prop Firms
Prop firm challenges have strict drawdown limits. The 1% rule keeps you safe:
| Account Size | 1% Risk | Trades to Hit Drawdown (4%) |
|---|---|---|
| $25,000 | $250 | ~16 consecutive losses |
| $50,000 | $500 | ~8 consecutive losses |
| $100,000 | $1,000 | ~4 consecutive losses |
| $200,000 | $2,000 | ~2 consecutive losses |
With 1% risk and a typical 40% win rate, you can expect a maximum losing streak of 3-5 trades before a profitable run.
How to Calculate Position Size
Position Size = (Account Balance X Risk Percentage) / Stop Loss Distance
Example: MES Futures, $100K Account, 0.5% Risk
- Account balance: $100,000
- Risk per trade: 0.5% = $500
- Stop loss: 10 points
- MES value: $5 per point
