Position sizing determines how much money you put into each trade. It’s the most overlooked aspect of trading — yet it has more impact on your profitability than any indicator or pattern. The right position size protects your capital during losing streaks and maximizes gains during winning streaks.
The Fixed Percentage Method
The most popular approach: risk a fixed percentage of your total trading capital on each trade. Most professionals use 1-2%.
Formula: Position Size = (Account × Risk %) ÷ (Entry – Stop Loss)
Example: $10,000 account, 2% risk ($200), buy Bitcoin at $100,000 with stop at $97,000 (3% stop). Position size = $200 ÷ $3,000 × $100,000 = $6,667 worth of Bitcoin.
If the trade hits stop: you lose $200 (2% of account). If the trade hits a 2:1 target: you gain $400 (4% of account). Your account survives 50 consecutive losses before going to zero — practically impossible with any reasonable strategy.
Why 1-2% Works
- At 1% risk: 20 consecutive losses = 18% drawdown (recoverable)
- At 2% risk: 20 consecutive losses = 33% drawdown (painful but recoverable)
- At 5% risk: 20 consecutive losses = 64% drawdown (devastating)
- At 10% risk: 10 consecutive losses = 65% drawdown (account nearly destroyed)
Losing streaks of 5-10 trades happen to EVERY trader. Small position sizes ensure you survive them.
Adjusting for Volatility
Use ATR-based position sizing for consistency across different coins:
Position Size = (Account × Risk %) ÷ (N × ATR)
Where N = your ATR stop multiplier (1.5-2x). This automatically gives you smaller positions on volatile coins and larger positions on stable ones — same dollar risk regardless.
Common Mistakes
- “Going all in”: Putting 50-100% of your account on one trade. One bad trade = game over.
- Increasing size after losses: Revenge trading with bigger positions to “win it back.” This accelerates losses.
- Decreasing size after wins: Getting scared after a winning streak and reducing size means you miss the best opportunities.
- Ignoring position sizing entirely: Trading random amounts based on “feeling.” This is gambling.
The Kelly Criterion (Advanced)
The Kelly formula calculates the mathematically optimal bet size: Kelly % = (Win Rate × Average Win – Loss Rate × Average Loss) ÷ Average Win. In practice, most traders use “Half Kelly” (half the recommended size) for a smoother equity curve. Don’t worry about Kelly until you have 100+ trades of data to calculate from.
Master position sizing and you’ll outperform 90% of traders who focus only on entries. Apply this on every trade you make on Mal.io.
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