//+------------------------------------------------------------------+
//|                                                     Dials MM.mq4 |
//|                                     Copyright © 2007, MQLService |
//|                                        http://www.mqlservice.com |
//| $Id: //mqlservice/mt4files/experts/indicators/Dials MM.mq4#1 $
//+------------------------------------------------------------------+
#property copyright "Copyright © 2007, MQLService"
#property link      "http://www.mqlservice.com"

#property indicator_chart_window
//---- input parameters
extern double    Risk=1.0;
extern int       StopLoss=20;

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
  Comment("");
  return(0);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
  double mrisk = AccountFreeMargin()*Risk/100.0;
  double risk1l = MarketInfo(Symbol(), MODE_TICKVALUE)*StopLoss;
  Comment("Risk is ", DoubleToStr(Risk, 2)," % = ", DoubleToStr(mrisk, 2),"$\nStop loss is ",StopLoss," pips = ", 
          DoubleToStr(risk1l, 2), "$ with 1 lot\nPosition size should be ", 
          DoubleToStr(normalize_volume(mrisk/risk1l), 2)," lots");
  return(0);
}

double normalize_volume(double lots){
  // Adjust trade volume to broker
  double step   = MarketInfo(Symbol(), MODE_LOTSTEP);
  double min    = MarketInfo(Symbol(), MODE_MINLOT);
  double max    = MarketInfo(Symbol(), MODE_MAXLOT);
  if(max > 0)
    lots = MathMin(lots, max);
  if(step > 0)
    double result = MathFloor(lots/step)*step;
  else
    result = 0;
  if(result < min)
    if(min>0)
      return(min);
    else
      return(lots);
  else if(result > 0)
    return(result);
  else
    return(lots);
}

//+----------- Coded by Michal Rutka @ MQLService.com ---------------+