Zerodha, your brokerage calculator is awesome. Suggestion : Can you also put up the margin required for the trade in the calculator somewhere ?? I know it is scripwise and margins are different, so maybe you can do it in equities.
For F&O, maybe you can have a daily updated file which tells you how much money will be needed to trade 1 lot of a particular scrip. I mean, not in terms of percentages, but in terms of money. The format could have the following columns :
Scrip name, expiry date, Lot size, CMP (yesterday's LTP), approximate margins required for intraday, approximate margins required for delivery.
This will help a customer plan his trades in advance. I mean, suppose I have 10k in my account, I can look up this file and decide on the scrips whose futures I can trade with the money that I have.