This script can be used for Position Sizing.
After you entered Capital you have, how much you can Risk per Trade, Profit and Stoploss Levels, it calculates Number of Buys/Sells, Position Size and Reward/Risk ratio. you need to choose one of "Long" or "Short" position you will take.
Number of Buys formula = Capital * RiskPerTrade / Loss
Position Size = NumberOfBuys * EntryPrice
Reward / Risk rate = (TargetPrice - EntryPrice) / (EntryPrice - StoplossPrice)