Position Sizing: How Much Should You Risk Per Trade?
Position sizing determines how much capital you put into a single trade. It might be the most important skill in trading — and the most underrated.
Why Position Sizing Is Important
You can have the best strategy in the world, but if your position is too large, you won't survive the natural fluctuations.
Two traders with the same strategy, the same win rate, but different position sizing: one survives, the other goes bankrupt.
The Basic Formula
Position sizing is simple math:
- Determine your risk per trade (e.g., 1% of your account)
- Determine your stop loss distance (in pips or points)
- Calculate your lot size
Example
- Account: €5,000
- Risk per trade: 1% = €50
- Stop loss distance: 50 pips
- Value per pip (standard lot): $10
To risk a maximum of €50 with a 50 pip stop: 50 / (50 x $10) = 0.02 lots
This means you open 0.02 lots. Whether the trade wins or loses, your max loss is €50.
The 1% Rule
The most commonly used rule among professional traders: never risk more than 1% of your account per trade.
Why 1%? Because then you can have 20 consecutive losses (which is extraordinarily rare) and still have 82% of your account left.
Factors That Affect Your Position Sizing
- Account Size — larger account = more flexibility
- Stop Loss Distance — larger stop = smaller position
- Volatility — high volatility = smaller position
- Certainty of Setup — the stronger the setup, the closer to your maximum
Common Mistakes
Too Large Positions
Beginners often take positions that risk 5-10% of their account. One series of losses and they're out.
Fixed Lot Sizes
Many traders always use the same lot size, regardless of the stop loss distance. This means that the risk per trade varies significantly.
No Recalculation
If your account grows or shrinks, you need to adjust your position sizing accordingly. A fixed €50 risk is no longer correct if your account has gone from €5,000 to €8,000.
Conclusion
Position sizing is the math that protects you from yourself. It ensures that no trade can destroy your account. Always calculate your position before you open — not afterward.
