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Estimating Maximum Permitted Trade Size from Free Margin

Article MQL5 code base
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Summary

This document describes a trading account script that displays the maximum lot size the account can currently support. The estimate is based on free margin, which reflects account funds available for opening positions, and is influenced by account size and leverage. A small graphical panel presents the result, providing a way to check the limit without loading an expert advisor.

The note explains the tool's purpose and calculation basis, but gives no formula, implementation details, examples, or performance evidence. It also does not explain how instrument margin requirements, existing positions, or broker-specific rules affect the estimate. Traders should therefore treat the displayed size as an account-level indication rather than a complete position-sizing or risk-management method; the document does not describe how to set exposure relative to potential losses.

Key ideas

  • The script displays an estimated maximum lot size for a trading account.
  • The estimate uses free margin and depends on account size and leverage.
  • A graphical panel makes the information available without loading an expert advisor.
  • The document provides no formula or guidance on adjusting for instrument or broker margin rules.

Tags

ForexPosition sizingRisk management

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.