Answer: the actual call price minus the intrinsic value of the call.
Explanation:
The actual price of a call is calculated as the sum of the intrinsic value of the call and the time value of the call option in the manner:
Price of call = Intrinsic value of call + Time value of call
The Time value of the call is therefore:
Change subject of below formula:
Price of call = Intrinsic value of call + Time value of call
Time value of call = Price of call - Intrinsic value of call