nCalculate Lot by Percent - MetaTrader 5 Library - MT4/MT5 Resources

Automatically calculates the size of trading positions (lots) so that the potential loss when a stop loss is triggered is a specified percentage of your deposit. This is the basis of effective money management.

You set: risk percentage (e.g. 2%) and stop loss price.

This function calculates how much you can trade so that your account loses no more than 2% if the price reaches your stop loss.

The function translates this into lots, taking into account your broker's instrument specifications.

Smart logic: automatically applies the correct formula to pairs like EURUSD and USDJPY .

Check: Monitor correct price, minimum and maximum lot sizes.

Ready for use: A function call that returns the lot size to be sent to the market order.

 // Risk 1.5% of deposit by setting stop loss at 1.08500
double myLot = _Lot_( 1.5 , 1.08500 ); if (myLot > 0 ) {
// Open a position using the calculated lot size Trade.Sell(myLot, _symbol , 0 , 1.08500 , 0 , "Trade with 1.5% risk" );
}

Bottom line: This code gets rid of manual calculations and helps you maintain risk discipline on every trade. Just plug it into your EA or script.

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Attachment download

📎 Percent_of_Deposit.mqh (4.42 KB)

📎 Screenshot_1.png (76.81 KB)

📎 nCalculate_Lot_by_Percent.mq5 (3.01 KB)

Source: MQL5 #68396