Percentage-Based Risk: A Position Sizing Framework

Percentage-based risk involves risking a defined percentage of your total account balance on each trade, rather than a fixed currency amount. For example, if a trader decides to risk 1% per trade, the actual monetary amount at risk would be 1% of their current account balance at the time each trade is placed.

Because percentage-based risk is calculated from the current account balance, the monetary amount at risk automatically adjusts as the account balance changes. If the account grows, the monetary risk per trade grows proportionally; if the account shrinks, the monetary risk per trade shrinks proportionally as well, without requiring manual recalculation of a percentage figure.

This automatic scaling connects to the capital preservation principle covered in the previous unit. As an account balance declines, percentage-based risk automatically reduces the monetary amount at risk on subsequent trades, which can help moderate the pace of further losses during a difficult period, compared to maintaining a fixed monetary risk regardless of balance changes.