## Comment on How to use the option calculator?

Hi Nithin/Karthik,

Few Queries which I haven’t found an answer to.

First, What should go as IV in B&S formula ? On the NSE’s website, the IV figures are published for each strike in call/put option. For eg. 8600 call option shows an IV of 12.61 while the 8600 put options shows an IV of 15.44. NSE’s India VIX, as on date, is quoting at 14.8875. What IV should one use, if one were to derive the theoretical option value at any strike price ?

Second, NSE’s IV calculations are done assuming an interest rate of 10% (as claimed on the website). Should we, then, base our B&S calculations on RBI’s Treasury Bill rates(91 days) or on NSE’s interest rate figures ?

Thanks