Hello i want to trade options but my software gives me a long position on a specific instrument and i don't know how to calculate the option's prices. For example: Instrument: AFSILong: 11.55Stop loss 3.35Target: 22.5Is there a calculator to help convert stock's price to option's prices?Thanks

It doesn't sound like your program is offering options trading, nut short and long selling. Long and short selling is different.In options trading you would have a clear options price (or call) and an expiration date. The call is what you pay for it (not counting fees). If the call is $5.00 you would pay $5.00 for each share of a stock prices at say $20.00. The price would have to reach $25.00 by the expiration date or the option is worthless and you loose the investment. If it increases above the $25 you could sell it or keep it in hopes that it would increase further.

You can't convert a stock price to an option price. They don't work the same way. A stock could be priced at $25 and have multiple call options at all kinds of different prices. I hope you are not putting any real money at risk as you clearly do not know much about options trading. Do your homework before you get started.