- New MetaTrader 5 Platform build 4040: Improvements and fixes
- How to calculate order position size / total amount in USD?
- Lot calculation based on risk and leverage
This is how I calculate my lot size. I am not sure why you would want it in pips. Metatrader 5 wants it in a specific format.
double ASK = SymbolInfoDouble(_Symbol,SYMBOL_ASK); double pip_value = (_Point*10/ASK) * 100000; // ( pips / ask price ) (0.0001/134.223) * 100,000 (standard lot size) double risk_stoploss = dollar_to_risk / stoplosstemp; // $_Risk / stoploss = risk_value $50 / 40pips = 1.25 ($/pip) double lot = risk_stoploss / pip_value;
You will note that the _Point * 10 will give you the size of the pip such as 0.1 or 0.0001
Risk depends on your initial stop loss, lot size, and the value of the symbol. It does not depend on margin and leverage. No SL means you have infinite risk (on leveraged symbols). Never risk more than a small percentage of your trading funds, certainly less than 2% per trade, 6% total.
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You place the stop where it needs to be — where the reason for the trade is no longer valid.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.
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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.)
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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)
Is there an universal solution for Tick value? - Currency Pairs - General - MQL5 programming forum (2018)
Lot value calculation off by a factor of 100 - MQL5 programming forum (2019) -
You must normalize lots properly and check against min and max.
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You must also check Free Margin to avoid stop out
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For MT5, see 'Money Fixed Risk' - MQL5 Code Base (2017)
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.
- Senserek #: My broker offers a leverage of 1:500.What part of risk “does not depend on margin and leverage” was unclear?
- Senserek #: So the amount of risk taken is not the same for each instrument even if I always specify the same lot level?
What part of “DeltaPerLot is usually around $10/PIP, but it takes account of the exchange rates of the pair vs. your account currency” was unclear?

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