Lot Size Calculation from Risk Percentage

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 double GetLot_f()
 {
 double Free    =AccountFreeMargin();
 double One_Lot =MarketInfo(Symbol(),MODE_MARGINREQUIRED);
 double Step    =MarketInfo(Symbol(),MODE_LOTSTEP);
 double Loto     =MathFloor(Free*percent_of_deposit/100/One_Lot/Step)*Step;
 
 double Min_Lot =MarketInfo(Symbol(),MODE_MINLOT);
 double Max_Lot =MarketInfo(Symbol(),MODE_MAXLOT);
 if(Loto<Min_Lot) Loto=Min_Lot;
 if(Loto>Max_Lot) Loto=Max_Lot;
 
 return(NormalizeDouble(Loto,nor_lot));
 }

1. Play video	Please edit your post. For large amounts of code, attach it.

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2. Symbol_RC = Symbol();
   _bid = MarketInfo(Symbol_RC,MODE_BID);
   _ask = MarketInfo(Symbol_RC,MODE_ASK);

   Why use those function calls when working with current symbol. Just use the predefined Bid/Ask

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3. • You place the stop where it needs to be - where the reason for the trade is no longer valid.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.
   • Account Balance * percent = RISK = |OrderOpenPrice - OrderStopLoss| * OrderLots * DeltaPerlot (Note OOP-OSL includes the SPREAD)
   • Do NOT use TickValue by itself - DeltaPerlot
   • You must normalize lots properly and check against min and max.
     
   • You must also check FreeMargin to avoid stop out

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4.  return(NormalizeDouble(lotsizecalc,1));

   Do NOT use NormalizeDouble, EVER. For ANY Reason. It's a kludge, don't use it. It's use is always wrong
   • SL/TP (stops) need to be normalized to tick size (not Point.) (On 5Digit Broker Stops are only allowed to be placed on full pip values. How to find out in mql? - MQL4 forum) and abide by the limits Requirements and Limitations in Making Trades - Appendixes - MQL4 Tutorial and that requires understanding floating point equality Can price != price ? - MQL4 forum
   • Open price for pending orders need to be adjusted. On Currencies, Point == TickSize, so you will get the same answer, but it won't work on Metals. So do it right: Trailing Bar Entry EA - MQL4 forum or Bid/Ask: (No Need) to use NormalizeDouble in OrderSend - MQL4 forum
   • Lot size must also be adjusted to a multiple of LotStep. If that is not a power of 1/10 then NormalizeDouble is wrong. Do it right.
   
   

Thanks @eevvill: but i want to calculate from stoploss

Thanks WHRoeder: this stuff helped me alot let me try if can solve the issue to following these.... well really thanks for this :)

https://www.mql5.com/ru/code/viewcode/14296/79100/lot_risk_sl__2.mq4

1. Use the link button 
2. Violates
   Do NOT use TickValue by itself - DeltaPerlot

You are the worstest teacher(explanation) that I saw ever. So unfortenetly I can't use your advices.

Thanks @eevvill for the code :)

eevviill: You are the worstest teacher(explanation) that I saw ever. So unfortenetly I can't use your advices.	You won't read, study, learn, nor ask questions, so no one can teach you.

My pleasure.