Where do I find T BILL RATE and IV to calculate option premium

Algos, strategies, code
1

I am trying to create a premium calculator, but I can’t find these variable.

https://zerodha.com/tools/black-scholes/ by default says IV: 18% and Interest %: 7%. Is that correct?

RBI site says “364-Day Treasury Bill (Primary) Yield” = 3.63%

Which one is correct, and how to calculate IV?

2

Interest is ever changing one and you should take 91 days interest rate. I think it’s at 2.93. IV can be calculated from historical closing price. Check varsity for example

3

You can go through this post which explains how to use Black Scholes Calculator in detail:

4

Thanks.

It says 3.32%. I will use it.