If you are an active nifty option buyer or an expiry day index trader, here is a handy tool you will find useful.
Download, print and keep this reference chart on your trading desk.
This reference chart helps you quickly estimate the capital required to buy 1 lot of nifty option when it is trading at x price.
Useful when you are scalping large quantities of nifty options on the expiry day and take advantage of the volatility.
This chart saves you time from having to do all that ( ltp times 75 ) multiplications in your head.
You can concentrate more on your trading plan and not be distracted with the margin calculations.