Calculate optimal position sizes based on account size, risk tolerance, and stop-loss distance. Includes the 1% rule and fixed-fractional methods.
Position sizing determines how much capital to allocate to each trade — it's the bridge between your risk management rules and actual execution. Correct position sizing ensures that no single trade can significantly damage your account, while still allowing meaningful profits when you're right.
The formula is simple: Position Size = (Account × Risk%) / Distance to Stop Loss. If your $10,000 account risks 1% ($100) and your stop is 5% below entry, your position is $2,000. This ensures you lose exactly $100 if stopped out — regardless of the trade setup.
Risk/Reward Ratio (1:3 Example)
The most common approach: risk a fixed percentage (1-2%) of your current account balance on every trade. As your account grows, position sizes grow proportionally. As it shrinks, positions shrink — automatically reducing risk during drawdowns.
Example progression: $10,000 account × 1% = $100 risk per trade. After growing to $15,000: $150 risk per trade. After a drawdown to $8,000: $80 risk per trade. The method is self-correcting.
Not all trades are equal. A textbook setup with multiple confluences (S/R + pattern + volume + indicator alignment) deserves more size than a speculative trade with one signal. Consider a tiered approach:
A+ setups (high conviction): 2% risk — multiple confluences, clear invalidation, strong R:R.
B setups (moderate conviction): 1% risk — good setup but fewer confirmations.
C setups (speculative): 0.5% risk — interesting idea but less certain. These are your "lottery tickets."
With leverage, position sizing becomes critical. The formula adjusts: Margin Required = Position Size / Leverage. But your RISK remains the same — determined by your stop-loss distance, not your leverage.
Example: You want to risk $100 with a 2% stop-loss. Position size = $5,000. At 5x leverage, you need $1,000 margin. At 10x, you need $500 margin. The risk ($100) is identical — leverage just changes how much margin is locked up.
The danger: higher leverage means your liquidation price is closer to entry. Always ensure your stop-loss triggers well before liquidation.
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