Risk Management Basics and Lot Sizing for Automated Trading

Summary

This introductory article explains how a risk-management class for MetaTrader 5 could track daily, weekly, total, and per-trade losses, as well as profits. It describes setting thresholds, checking account conditions during operation, and stopping or closing trades when limits are breached. The discussion frames these controls as especially relevant to automated strategies and accounts with strict loss rules.

The coding walkthrough begins with order-price calculation and lot sizing. It distinguishes the maximum volume permitted by free margin from a risk-based position size, which depends on the chosen loss amount and stop distance. An example uses gold and reports a lot-size result for a stated stop distance and risk percentage. These are implementation examples rather than evidence of strategy performance. The article is part one of a series, and its stated scope is foundational functions for later integration into a fuller class and interface. Readers must still account for instrument contract specifications, transaction costs, and execution conditions when adapting the calculations.

Key ideas

• The proposed risk framework tracks loss limits across daily, weekly, total, and individual-trade periods.
• Automated checks can compare account losses with preset thresholds and respond by stopping or closing trades.
• Position sizing should reflect the chosen risk amount and stop distance, while free margin sets a separate volume constraint.
• Order prices depend on symbol quotes and order type, including pending orders.
• The worked example illustrates implementation but does not demonstrate trading performance.

Tags

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