I ported part of Dan Harvey's Weirdor spreadsheet to an online version last year. I converted the Greeks calculator to PHP today and got it live at http://capitaldiscussions.com/option-position-greeks-calculator/10316 The tool helps you monitor your position Greeks and let you know if they are getting out of line. I store cookies with your latest information so you don't have to keep re-entering the same data (such as price and volatility). If you come back to the tool within 100 days, your data will still be there (assuming you use the same web browser). The tool was originally intended for Weirdor trades, but it should be useful for JEEP trades, Butterfliy trades and Iron Condor trades. Any trade that you want to keep balanced, neutral option Greeks.