Intraday: Ex. If Nifty is in 4955 and the call 4900 is trading at Rs.70, at this stage, I like to place a call-buy order if Nifty crosses over 4980, but I am confused what will be the premium price while Nifty is at 4980, how can I find it?
As pointed out by others the Option price depends on various fators and it will be difficult to predict what price it will be at certain point.
I noticed the following during intraday.
The Option price depends on how fast 4980 is reached from 4955. Suppose this 25 point is reached within 10 minutes non-stop, then the 4700 call rate may reach 85-90 also. On the other hand if this reach is slow and with lot of fluctuation it may struggle to reach even 80. Also it depends on the time left for further trading of the day etc.
If I am holding a Call like the above say at 70 and want to sell at some profit and the trend is bullish, I may put my sell price at 90 and wait. Also I prefer to check Nifty tick data at the point of buy or sell.
Keep watching both nifty tick data and Option price to know the behavior and you will, over a period of time, will be able to use it for catching good buy/sell price.