A Chart-Based Expert Advisor for Risk and Reward Position Sizing
Summary
The article describes an interactive semi-automatic Expert Advisor for planning and placing manual trades from a MetaTrader chart. Users can set an equity-risk percentage and a risk-to-reward ratio, adjust them while the EA is running, and drag a stop-loss marker to a price level. The interface recalculates maximum permitted lot size and estimated equity risk and reward, displays colored chart regions for risk and reward, and can submit a buy or sell market order using the configured levels.
The implementation uses chart objects for editable fields, labels, buttons, rectangles, and the draggable stop-loss marker, with chart events handling user interaction. The article focuses on interface and calculation design, illustrating how to build a configurable trading aid; it does not provide performance evidence for a trading strategy or establish that the displayed risk estimates capture all live execution costs or outcomes. The tool supports decision-making and order entry rather than generating trade signals.
Key ideas
- The EA calculates position size from account equity risk and the stop-loss distance.
- Users can change the risk percentage, reward ratio, and lot size while the tool is running.
- A draggable stop-loss marker updates displayed risk and reward levels on the chart.
- The interface uses chart objects and event handling to support parameter entry and market-order submission.
- The article demonstrates a trading interface, not a strategy with measured performance.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.