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Calculating Maximum Position Size from Available Margin

Article MQL5 code base
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Summary

The document describes a trading-platform script that calculates the largest lot size that can be opened using all free margin currently available in an account. It displays the calculated size in the chart’s upper-right corner for a default period of ten seconds. This makes the script a practical aid for translating available margin into a potential position size before placing a trade.

The description does not explain the calculation, margin assumptions, instrument-specific contract rules, or how the displayed figure should be adjusted for risk limits. Using all available margin does not itself establish an appropriate risk level, and the document offers no performance evidence or testing results. It identifies the script’s author and notes that an earlier version was implemented in MQL4, but provides no further operational guidance in the supplied text.

Key ideas

  • The script estimates the largest lot size that available free margin can support.
  • It displays the result in the chart’s upper-right area for a default ten seconds.
  • The description does not specify its calculation method or instrument-specific assumptions.
  • A maximum margin-based size is not a complete risk-sizing rule.

Tags

Position sizingRisk managementExecution

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