Lot Size Calculation Based on Stop Loss and Risk Percentage
Info
The Lot Size Calculation Based on Stop Loss and Risk Percentage is a Library for MetaTrader 4 that this function calculates the appropriate lot size for a trade based on a specified stop loss distance and a risk percentage of the trading account balance. The calculation ensures that if the stop loss level is reached, the resulting loss will be equivalent to the defined risk percentage of the total account balance.
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 Lot Size Calculation Based on Stop Loss and Risk Percentage
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 function calculates the appropriate lot size for a trade based on a specified stop loss distance and a risk percentage of the trading account balance.
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: Lot Size Calculator - another powerful library for MetaTrader 4 traders.
This function calculates the appropriate lot size for a trade based on a specified stop loss distance and a risk percentage of the trading account balance.Also recommended: Automated Lot Size Calculator - similar library with strong performance on MetaTrader 4.
The calculation ensures that if the stop loss level is reached, the resulting loss will be equivalent to the defined risk percentage of the total account balance.
For example, if the risk is set to 2% and the stop loss is set to 40 points, the lot size will be determined such that a loss at the stop loss level amounts to 2% of the deposit. This helps traders manage their risk effectively on a per-trade basis.
This feature is particularly useful for maintaining consistent risk management across all trades, regardless of stop loss distance or account size.
You may also like: Simplified Stop Loss Calculation for Market Execution Orders - excellent alternative for library users on MetaTrader 4.
Source Code
#property library
#property version "1.12"
double perc_lot_by_stop_f(int sl=0,double lot_sl_risk=1)
{
if(sl<=0) {alert("need sl to be set!..min lot mode");return(marketinfo(symbol(),mode_minlot));}
double lose_on_stop_lose=sl*(marketinfo(symbol(),mode_tickvalue)/(1/marketinfo(symbol(),mode_minlot)));
double propotion=(accountbalance()/100*lot_sl_risk)/lose_on_stop_lose;
double loto_=marketinfo(symbol(),mode_minlot)*propotion;
if(loto_<marketinfo(symbol(),mode_minlot)) loto_=marketinfo(symbol(),mode_minlot);
if(loto_>marketinfo(symbol(),mode_maxlot)) loto_=marketinfo(symbol(),mode_maxlot);.......
⚠ 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.