Vacationing in Japan isn't the cheapest vacation in the world, but it's certainly very memorable. In my mind I figure that setting aside $3000-$4000 dollars insures more than enough money to pay for everything I will need for two weeks in Japan. Flight, transportation, lodging, food, and souvenirs.
This website has the most accurate break down of a budget for a week in Japan:
Travel Budget for One Week in Japan
I also enjoyed this website's budget breakdown:
Nerd Nomads
I wish flights out of CVG were straight to Japan, but unfortunately we have to layover elsewhere. That also means a more expensive round-trip flight.
What about food? How much per day should you set aside for food? Thankfully, according to most sites, not as much as you would think. You can eat good food cheap in Japan!
How much it costs to eat in Japan
Also, for transportation, there is the question of whether or not to buy a Rail Pass. It can only be used for the slower (more stops) three Shinkansen lines, and only on JR Rails, so that excludes buses, taxis and subways. Is it worth it? Figure out where you will be going, what the local transportation is, and then see if that adds up to more than the Rail Pass's price.
Tips and Advice on the Japan Rail Pass
I tried my hand at our own trip's budget using the current Yen to Dollar, rail pass prices, hostel prices, and data collected on airfare prices.