Is there a software out there that calculates position size depending on risk. I would enter: - The amount I want to risk. - Where my stop on the underlying is - Maybe where my target point is and when Depending on the greeks, the software would tell which options to buy and how many. I have been trading options for a long time now, and I have noticed many times that I could be wrong on a stock that goes 5% against me and lose twice what I make on a stock going 5% my way, with the same investment. I understand that I should look at the greeks, but I wonder if there are some tools out there that would do some of the work for me.