Automated Lot Size Calculator
Info
The Automated Lot Size Calculator is a Library for MetaTrader 4 that this tool calculates the appropriate lot size for trades based on a user-defined risk percentage. Ensure your risk management strategy is clearly defined before using this feature.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 4 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL4/Libraries folder via File ? Open Data Folder in MetaTrader 4.
How to Install and Use Automated Lot Size Calculator
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
This tool calculates the appropriate lot size for trades based on a user-defined risk percentage.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 4.
Compatible Platform & Setup
This Library works on MetaTrader 4. Place the file in the MQL4/Libraries folder and restart the terminal.
Description & Settings
Related: Automated MT4/MT5 Backtester Control - another powerful library for MetaTrader 4 traders.
This tool calculates the appropriate lot size for trades based on a user-defined risk percentage. Ensure your risk management strategy is clearly defined before using this feature.Also recommended: Lot Size Calculation Based on Stop Loss and Risk Percentage - similar library with strong performance on MetaTrader 4.
The lot size is automatically determined by the risk percentage specified in the input parameters, helping traders maintain consistent risk per trade.Key Functionality
- Lot Size Calculation: Automatically computes the correct lot size.
- Risk Management: Adheres to the risk percentage set by the user.
Version 2026
You may also like: Automated Optimization Library for MT4/MT5 - excellent alternative for library users on MetaTrader 4.
Source Code
#property library
#property copyright "robotfx"
#property link "https://robotfx.org"
#property version "1.00"
#property strict
extern double lotsize = 0.01;
extern bool usemm = false;
extern int risk = 1;
double lots()
{.......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.