Using MQL5 Account and Symbol Data to Calculate Position Margin
Summary
This document explains how an MQL5 Expert Advisor can read account and instrument properties needed for money management. Account queries provide balance, equity, used and free margin, floating profit or loss, deposit currency, leverage, Stop Out threshold and mode, and permissions for account and expert trading. Symbol queries provide contract size, base, quote and margin currencies, and instrument descriptions.
It then outlines how to estimate the funds required to open a position by expressing the contract value in the account currency. The conversion depends on whether the instrument is a direct, reverse or cross currency pair, and the calculation uses an appropriate exchange-rate symbol and direction. The estimated contract value is divided by account leverage to obtain the margin requirement; for reverse and cross pairs, the value can change as exchange rates move. The text is an implementation guide rather than a tested risk model: its calculation section is partly omitted, and it does not establish that margin estimates alone are sufficient for sizing or controlling risk.
Key ideas
- Account properties expose balance, equity, used margin, free margin, profit, deposit currency, leverage, and Stop Out settings.
- Trading permission at the account level and permission for Expert Advisors are separate checks.
- Symbol metadata identifies contract size and the currencies used for the instrument, profit, and margin.
- Estimating required margin involves converting contract value into the account currency and accounting for leverage.
- Exchange-rate movements can change margin estimates for reverse and cross currency pairs.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.