Position Sizing
By Menno van Ravels - 13 years in crypto, 3 bear markets survived, zero paid promotions
AI Quick Summary: Position Sizing Summary
Term
Position Sizing
Category
Risk
Definition
Position sizing determines how much capital to allocate to each trade or investment.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-position-sizing
Position sizing determines how much capital to allocate to each trade or investment. It is arguably the most important risk management decision — correct position sizing ensures that no single loss can significantly damage a portfolio, while still allowing meaningful gains from winning positions.
Position sizing is the discipline of translating your risk tolerance and trade quality into specific dollar amounts. Many traders know which way markets will go more often than not, but still lose money because their position sizes are wrong.
**The fundamental principle:** No single position should be able to cause catastrophic portfolio loss. This means setting a maximum risk per trade (e.g., 1–2% of total portfolio) and calculating position size from that maximum.
**Fixed fractional position sizing:** Risk a fixed % of portfolio per trade: - Portfolio: $100,000 - Risk per trade: 1% ($1,000 maximum risk) - Stop loss for this trade: 5% below entry - Maximum position size: $1,000 / 5% = $20,000 (20% of portfolio)
**The mathematics of ruin:** Why max risk per trade matters: - 50% win rate, 1% risk per trade: Never bankrupt, profitable with good RR - 50% win rate, 20% risk per trade: 10 consecutive losses = 90% drawdown - 10 consecutive losses at 20% risk: (0.8)^10 = 10.7% of capital remaining
**Common position sizing approaches:** 1. **Fixed fractional** (risk fixed %, adjust size): Best for traders 2. **Fixed ratio** (increase size after reaching profit targets): Better for growing accounts 3. **Kelly criterion** (mathematically optimal fraction): Theoretically optimal, risky in practice 4. **Volatility-adjusted** (larger positions in low-vol assets): Equalizes risk across different assets
**Portfolio concentration limits:** Beyond individual trade sizing, total allocation limits matter: - No single asset > 30–40% of portfolio - No single sector (e.g., DeFi) > 50% of crypto allocation - Total crypto exposure capped based on risk tolerance
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Frequently Asked Questions
What percentage of portfolio should each crypto trade risk?
1–2% per trade is the standard for active traders. This allows 50–100 consecutive losses before a 50% drawdown — sufficient buffer for any reasonable trading system's drawdown period. Higher risk per trade (5–10%) is common among aggressive altcoin traders but produces dramatic drawdowns. For long-term investors (not traders), allocation limits (10–30% in any single asset) replace per-trade risk calculations.
How do you size a position when you have high conviction?
High conviction should increase your position size within your maximum position size limit — not eliminate risk management entirely. If you normally risk 1% per trade and have very high conviction, risk 2–3% maximum. Never eliminate the position size ceiling because conviction is subjective and wrong more often than it feels. Markets don't reward conviction; they reward probability × risk/reward.
What is the relationship between position sizing and leverage?
Leverage amplifies both gains and losses, making position sizing even more critical. If you use 5× leverage, a 10% adverse move = 50% position loss. To limit portfolio risk to 1%, a 5× leveraged position should be sized to risk 1% of portfolio even with the leverage magnification. In practice: smaller notional size with leverage to keep total risk equivalent to unleveraged positions.
Related Tools on Alpha Factory
Related Terms
Kelly Criterion
The Kelly criterion is a mathematical formula that determines the optimal percentage of your portfolio to risk on a single bet or trade, maximizing long-term growth rate while avoiding ruin. It balances edge size against probability of winning.
Risk Per Trade
Risk per trade is the maximum amount of capital a trader is willing to lose on a single trade, typically expressed as a percentage of total account equity. Professional traders commonly risk 0.5–2% per trade, ensuring that no single loss can significantly damage their account or trigger emotional decision-making.
Stop Loss
A stop loss is a pre-set order that automatically sells (or closes) a position when price reaches a specified level, limiting the maximum loss on a trade. Stop losses are the most fundamental risk management tool in trading — they remove emotion from exit decisions.
Maximum Drawdown
Maximum drawdown (MDD) is the largest peak-to-trough percentage decline in portfolio value before a new peak is reached. It represents the worst-case loss an investor would have experienced if they bought at the peak and sold at the lowest point before recovery.
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