Cheaper option??

I will be travelling to Japan from 26December to 7January and I'm thinking if it will be good to get the rail pass. I have yet to plan my itinerary but I'm thinking of travelling out of Tokyo for maybe 2 days to Kyoto. My accommodation is at the Akihabara line (JR line) and i didnt plan to stay at Kyoto.

I've read about the different tickets and since the JR line covers almost all the places I'm intending to go (JR Yamanote line & if I'm travelling out of tokyo), i was wondering if it will cost cheaper to get the pass instead of the normal train tickets for travelling??