Option calculation

  1. I want to know about which best free option calculator available on net?

  2. If I want to short OTM Put and I want to calculate Stop loss for in case market move against my position and reach to my put strike what will be the value than how to calculate that.

  3. How to keep stop loss in OTM writting?

Please help me in it
Waiting for your reply

Thank you
Sangram Badhe
Mob. 9823060909
e-mail : sangram.badhe@gmail.com