Trying to find a website that lets you calculate the value of stock options? Not just current value but ...?

Question

Im looking for a site i found a few months back and had bookmarked but then my computer got all messed up and I lost it. It lets you enter the stock symbol and then you select what kind of option contract you have. (calls or puts and the strike price. Then you can change the current stock price to get a guesstimate of what the option would be worth based on how many days left til expiration.

Ex- if I own SIRIUS Sept 08 Calls at .10 and SIRI is currently trading at $1.90 I could then change the value of SIRI to say $3 or $5 and see what the option value would be approximately based on the change in price and how much to expect it to appreciate. Thanks to anyone who can help with a site to do this. I use Scottrade and can track option prices on that or any website, but cant find that unique feature on any sites.

Answer 1

You can do this at any site that has an options calculator. I prefer the one at

http://www.ivolatility.com/

because it plugs in values for the interest rate and the implied volatility for you. If I remember correctly you have to register at the site to use the calculator, If that is a problem for you think you can use the same calculator at

http://www.cboe.com/framed/IVolframed.as...

without registering.

If you are willing to download software the Options Toolbox from

http://www.cboe.com/LearnCenter/Software...

will also make the estimates you want. The "position analysis" portion of the product allows you to enter a multi-legged spread and it will estimate the future value for you as time until expiration, implied volatility, and/or the stock price change.