How can I calculate option trade charges (STT, GST, stamp etc)

General
1

Let’s say,

I did the two trades:

“Sell 25 Bank Nifty 37000 PE” at 400rs and “Buy 25 Bank Nifty 37000 PE” at 400rs.

How much money will I lose in total? Zerodha Brokerage calculator says “-65.03”. Is it correct?

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Are all charges calculated on the premium and not on spot price?

2

yes, one benefit over futures is way less charges.