Universal Pip Value and Dynamic Lot Size Calculator for MQL5

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CRiskCalculator is an object-oriented MQL5 header library for risk management and volume calculations in Expert Advisors and trading tools.

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It calculates pip values and lot sizes based on account risk and Stop Loss distance in pips.

This class handles position sizing for cross-currency pairs by using native MetaTrader 5 symbol properties and a fallback conversion system.



Key Features



Dual-Engine Calculation:
Uses native broker properties (SYMBOL_TRADE_TICK_VALUE and SYMBOL_TRADE_TICK_SIZE) primarily.
Falls back to manual base/quote currency extraction and conversion rate queries if native properties are unavailable.



Broker Parameter Normalization:
Clamps calculated volumes between SYMBOL_VOLUME_MIN and SYMBOL_VOLUME_MAX.
Aligns lot sizes to SYMBOL_VOLUME_STEP to prevent broker rejection errors.



Clean OOP Design:
Encapsulated within the CRiskCalculator class with no global scope clutter.
Easy to integrate into existing EA projects or custom indicators.



Self-Configuring:
Automatically detects the account base currency (ACCOUNT_CURRENCY) upon initialization.



Integration Example

To use this class, include CRiskCalculator.mqh in your MQL5/Include/ directory and instantiate the object:

#include
<CRiskCalculator.mqh>

// Helper function to render a high-contrast panel on the chart

void DrawChartPanel(const string &lines[])
{
int x = 20, y = 30;
int width = 280, lineHeight = 18;
int height = (ArraySize(lines) * lineHeight) + 20;

// 1. Create Background Box
string bgName = "RiskCalc_BG";
if(ObjectFind(0, bgName) < 0)
ObjectCreate(0, bgName, OBJ_RECTANGLE_LABEL, 0, 0, 0);

ObjectSetInteger(0, bgName, OBJPROP_CORNER, CORNER_LEFT_UPPER);
ObjectSetInteger(0, bgName, OBJPROP_XDISTANCE, x);
ObjectSetInteger(0, bgName, OBJPROP_YDISTANCE, y);
ObjectSetInteger(0, bgName, OBJPROP_XSIZE, width);
ObjectSetInteger(0, bgName, OBJPROP_YSIZE, height);
ObjectSetInteger(0, bgName, OBJPROP_BGCOLOR, clrDarkSlateGray);
ObjectSetInteger(0, bgName, OBJPROP_BORDER_COLOR, clrDodgerBlue);
ObjectSetInteger(0, bgName, OBJPROP_BORDER_TYPE, BORDER_FLAT);
ObjectSetInteger(0, bgName, OBJPROP_SELECTABLE, false);

// 2. Render Text Lines inside the panel
for(int i = 0; i < ArraySize(lines); i++)
{
string lblName = "RiskCalc_Lbl_" + IntegerToString(i);
if(ObjectFind(0, lblName) < 0)
ObjectCreate(0, lblName, OBJ_LABEL, 0, 0, 0);

ObjectSetInteger(0, lblName, OBJPROP_CORNER, CORNER_LEFT_UPPER);
ObjectSetInteger(0, lblName, OBJPROP_XDISTANCE, x + 12);
ObjectSetInteger(0, lblName, OBJPROP_YDISTANCE, y + 10 + (i * lineHeight));
ObjectSetString(0, lblName, OBJPROP_TEXT, lines[i]);
ObjectSetString(0, lblName, OBJPROP_FONT, "Segoe UI");
ObjectSetInteger(0, lblName, OBJPROP_FONTSIZE, 9);
ObjectSetInteger(0, lblName, OBJPROP_COLOR, (i == 0) ? clrYellow : clrWhite);
ObjectSetInteger(0, lblName, OBJPROP_SELECTABLE, false);
}

ChartRedraw(0);
}

void OnStart()
{
// Instantiate the risk calculator
CRiskCalculator riskCalc;

string symbol = _Symbol;
double riskAmount = 100.0; // Target risk in account currency
double slPips = 25.0; // Stop Loss distance in pips

// Calculate parameters
double lotSize = riskCalc.CalculateLotSize(symbol, riskAmount, slPips);
double pipValPerLot = riskCalc.GetPipValuePerLot(symbol);

// Prepare output lines
string info[6];
info[0] = "=== RISK & POSITION CALCULATOR ===";
info[1] = "Symbol: " + symbol;
info[2] = "Account Currency: " + AccountInfoString(ACCOUNT_CURRENCY);
info[3] = "Target Risk: $" + DoubleToString(riskAmount, 2);
info[4] = "Calculated Lot Size: " + DoubleToString(lotSize, 2) + " lots";
info[5] = "Pip Value (1 Lot): " + DoubleToString(pipValPerLot, 2);

// Display GUI panel on chart
DrawChartPanel(info);
}



Class Reference



Method

Return Type

Description



GetPipValuePerLot(string symbol)

double

Returns the monetary value of 1 pip for 1 standard lot in the account currency.



GetPipValue(string symbol, double volume)

double

Returns the total monetary value of 1 pip for a specified volume.



CalculateLotSize(string symbol, double riskAmount, double slPips)

double

Calculates and normalizes the lot size for a target cash risk and Stop Loss in pips.



Need Custom Development or EA Integration?

For custom Expert Advisors, indicators, or advanced risk management systems for MetaTrader 5, contact us via MQL5 Freelance.

👉 Romeo Luvisotto — MQL5 Developer Profile & Freelance Services (2026)

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#include <CRiskCalculator.mqh>
void DrawChartPanel(const string &lines[])
  {
   int x = 20, y = 30;
   int width = 280, lineHeight = 18;
   int height = (ArraySize(lines) * lineHeight) + 20;
   string bgName = "RiskCalc_BG";
   if(ObjectFind(0, bgName) < 0)
      ObjectCreate(0, bgName, OBJ_RECTANGLE_LABEL, 0, 0, 0);
   ObjectSetInteger(0, bgName, OBJPROP_CORNER, CORNER_LEFT_UPPER);

.......

• 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.