Definition
Position sizing is the process of determining how much capital to allocate to a single trade or investment. Proper position sizing is fundamental to risk management, ensuring no single trade can cause catastrophic portfolio damage. Common methods include fixed dollar amount, percentage of portfolio, and volatility-based sizing. The goal is to balance potential returns against acceptable risk. Most professional traders risk only 1-2% of their portfolio on any single trade.
Formula
Example
With a $100,000 account risking 1% per trade ($1,000), buying a stock at $50 with a stop-loss at $48, your position size would be: $1,000 / ($50 - $48) = 500 shares.
FAQ
What is Position Sizing?
Determining how many shares or contracts to trade based on risk parameters.
How do you calculate Position Sizing?
A common formula for Position Sizing is: 仓位规模 = (账户风险金额) / (入场价 - 止损价); 账户风险金额 = 账户价值 x 风险百分比
Why is Position Sizing important?
Position Sizing helps investors evaluate trading mechanics and make more informed decisions.