Automating Risk-Based Position Sizing with Stop-Loss and Take-Profit Levels
Summary
The article describes a cross-platform Expert Advisor for MetaTrader 4 and 5 that uses a trader-defined entry and stop-loss level to calculate position size from a fixed dollar or percentage risk budget. It also sets a take-profit level from a configurable take-profit-to-stop-loss multiple, supports market entries and limit orders, and can expire pending orders after a chosen period. Input settings govern risk, stop distance, order behavior, and other trade parameters.
The design aims to reduce manual calculations and speed up order placement. It includes checks for minimum lot constraints that could make the actual risk exceed the target, with a setting to prevent such entries, as well as price-step validation for instruments with nonstandard tick sizes. Conditional compilation is used to support platform-specific order functions.
The article focuses on implementation rather than testing profitability. A fixed reward-to-risk multiple does not establish that a trade has a favorable expectancy, and position sizing depends on accurate contract and tick specifications. The stated percentage cap and suggested reward multiple are design choices, not universal prescriptions; traders still need to validate broker behavior and their own strategy assumptions.
Key ideas
- The Expert Advisor calculates trade volume from the distance between entry and stop loss and a chosen monetary or percentage risk limit.
- A configurable take-profit multiple sets the target distance relative to the stop-loss distance.
- The EA can reject trades when minimum permitted volume would exceed the chosen risk budget.
- Price-step checks help catch stop levels that do not align with an instrument's tick size.
- The implementation supports both MetaTrader 4 and 5, but the article does not establish strategy profitability.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.