how to calculate the exact frequency of this FM transmitter?

Using Arduino General Electronics
46

mauried:
Get yourself a copy of this book.
American Radio Relay League | Ham Radio Association and Resources

It explains the basic theory of Radio Comm pretty well, and has constructional articles of how to build both transmitterss and receivers.
Dont expect to learn everything in 5 minutes though.

i found the 2013 version of this book, it should be mostly the same as 2014 ?