Managing position size is one of the most effective ways to reduce trading risk and preserve your capital. It ensures that no single trade can wipe out a significant portion of your account, regardless of market volatility or strategy failure.
1. Know Your Risk Per Trade (% of Capital)
A common rule:
🔒 Risk no more than 1–2% of your total trading capital per trade
Example: If you have a $10,000 account and risk 1% per trade, your maximum loss = $100 per trade
2. Determine Your Stop-Loss in Dollars
Set a stop-loss based on your strategy (support/resistance, ATR, or fixed amount).
Example:
You’re buying a stock at $50
You place your stop-loss at $48
→ Your risk per share = $2
3. Use the Position Sizing Formula
Position Size=Max Risk Per Trade ($)Risk Per Share ($)\text{Position Size} = \frac{\text{Max Risk Per Trade (\$)}}{\text{Risk Per Share (\$)}}
Using the earlier example:
Max Risk: $100
Risk Per Share: $2
Position Size=1002=50 shares\text{Position Size} = \frac{100}{2} = 50 \text{ shares}
So you can buy 50 shares and still only risk 1% of your account.
4. Adjust for Leverage or Margin (if applicable)
If you’re using leverage (e.g., in forex, futures, or margin accounts), make sure your position size considers total exposure, not just margin used.
5. Consider Volatility (Optional but Smart)
Use the Average True Range (ATR) to adjust position size:
- In more volatile markets, reduce your size.
- In calmer markets, you can consider slightly larger positions (still within your risk tolerance).
✅ Bonus Tips to Reduce Risk Further:
- Avoid overtrading: Even with small size, frequent trades = cumulative risk
- Never double down on losing positions
- Recalculate size after every loss or gain if your capital changes significantly
- Use a trading journal to track your risk habits and improve discipline
🔁 Quick Reference:
Account Size | Risk per Trade (1%) | Stop-Loss ($) | Position Size |
---|---|---|---|
$5,000 | $50 | $0.50 | 100 shares |
$10,000 | $100 | $2.00 | 50 shares |
$25,000 | $250 | $5.00 | 50 shares |