Building an MQL5 Panel for Lot Size and Stop Loss Calculation
Summary
This tutorial extends an earlier risk-management tool by adding functions to estimate maximum volume from free margin, adjust lot size to a per-trade risk limit, and derive a stop-loss distance from a selected risk and lot. It also explains MQL5 chart coordinates, anchor corners, and control-library components, then applies them to a panel with editable fields, buttons, and dynamically updated selections.
The examples show panel outputs, including a calculated lot and stop distance, and describe diagnostic messages for invalid inputs or failed margin calculations. The article is primarily an implementation walkthrough, rather than a validated trading study. Its formulas depend on symbol properties and inputs such as spread and tick value, and the described calculations do not establish that a selected risk will match realized losses under slippage or changing market conditions. The focus is MQL5 interface construction and basic position-sizing workflow.
Key ideas
- Free margin and symbol volume increments are used to estimate a maximum tradable lot.
- Lot size can be reduced to fit a stated monetary risk limit.
- A stop-loss distance can be inferred from risk, lot size, spread, and tick value.
- MQL5 control classes support chart panels with editable inputs, buttons, and combo boxes.
- The examples demonstrate interface behavior but do not validate realized trading risk.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.