Automatic Lots calculation

[texoro]

double CalcolaSize(double RischioIns){

     double diff=MyStopLoss*Digits*Point;
     diff=NormalizeDouble(diff,Digits);
     Vol=(AccountFreeMargin()*RischioIns/100)/(MarketInfo(Symbol(),MODE_TICKVALUE)*diff*MathPow(10,MarketInfo(Symbol(),MODE_DIGITS)));
     return NormalizeDouble(Vol,2);

To adapt this function to the cent accounts I added "00".

 Vol=(AccountFreeMargin()*RischioIns/10000)/(MarketInfo(Symbol(),MODE_TICKVALUE)*diff*MathPow(10,MarketInfo(Symbol(),MODE_DIGITS))) 

but I've noticed that in gearboxes with "jpy" that have a smaller number of decimal places doesn't open anything;

I also tried to change the "100" with "MarketInfo(Symbol(),MODE_DIGITS)" and "DIGTS" but nothing is wrong...

someone can give me a hand

thanks 1000

Tag:None

[William Roeder]

1.      double diff=MyStopLoss*Digits*Point;

   Why are you multiplying your MyStopLoss by 5?

2. MathPow(10,MarketInfo(Symbol(),MODE_DIGITS))

   Do you realize that that is just Point?
   

3. Never risk more than a small percentage of your trading funds, certainly less than 2% per trade, 6% total.

   Risk depends on your initial stop loss, lot size, and the value of the pair. It does not depend on margin and leverage. No SL means you have infinite risk.

   1. You place the stop where it needs to be — where the reason for the trade is no longer valid. E.g. trading a support bounce the stop goes below the support.
   2. AccountBalance * percent/100 = RISK = OrderLots * (|OrderOpenPrice - OrderStopLoss| * DeltaPerLot + CommissionPerLot) (Note OOP-OSL includes the spread, and DeltaPerLot is usually around $10/pip but it takes account of the exchange rates of the pair vs. your account currency.)
   3. Do NOT use TickValue by itself - DeltaPerLot and verify that MODE_TICKVALUE is returning a value in your deposit currency, as promised by the documentation, or whether it is returning a value in the instrument's base currency.
                MODE_TICKVALUE is not reliable on non-fx instruments with many brokers - MQL4 programming forum 2017.10.10
                Is there an universal solution for Tick value? - Currency Pairs - General - MQL5 programming forum 2018.02.11
                Lot value calculation off by a factor of 100 - MQL5 programming forum 2019.07.19
   4. You must normalize lots properly and check against min and max.
   5. You must also check FreeMargin to avoid stop out

   Most pairs are worth about $10 per PIP. A $5 risk with a (very small) 5 PIP SL is $5/$10/5 or 0.1 Lots maximum.

[amrali]

https://www.mql5.com/en/code/28029

[texoro]

amrali:
https://www.mql5.com/en/code/28029

double CalcolaSizeA(double RischioIns, double sl_points)
{

   double risk= RischioIns;
   double TickSize  = SymbolInfoDouble(Symbol(),SYMBOL_TRADE_TICK_SIZE);
   double TickValue = SymbolInfoDouble(Symbol(),SYMBOL_TRADE_TICK_VALUE);
   double PointSize = SymbolInfoDouble(Symbol(),SYMBOL_POINT);
   double PointValue= TickValue * PointSize / TickSize;
   double capital=AccountInfoDouble(ACCOUNT_BALANCE);
   double risk_money=risk/100.0*capital;
   double lots = risk_money/sl_points/PointValue;
   double lotstep = SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP);
   lots = NormalizeDouble(lots/lotstep,0)*lotstep;
   return (lots);
}

From that tool that you posted me I extrapolated the code but on a capital of 1000 € calculates me 362.43 lots and obviously it gives me error where I made a mistake that I missed