Food costs per day

I'm planning a 3 week trip to Japan in March.
The only thing I'm unsure about are the food costs...

I thought of \5000 per day?

(simple breakfast, average lunch, upper average dinner... I like authentic dishes)

Also, is there a big difference between eating in Tokyo and Kansai? (cost wise)

For a simple meal by buying a coupon at the vending machine, the cost is about 500yen to 600yen.
If you have simple requirement on food ie can eat rice or noodles, 5000yen per day for 3 meals is sufficient.

(simple breakfast, average lunch, upper average dinner... I like authentic dishes)

With those descriptions I would estimate my spending to be around:

Breakfast: 300-500 yen
Lunch: 1000-1500 yen
Dinner: 2000-4000 yen

So 5000 yen would be a reasonable estimate, but a little higher budget would of course be better, especially if you drink with your meals.

5000 Yen is easily sufficient. As mentioned, 500 yen is about your basic breakfast. Many restaurants have 1000 yen specials for lunch which is probably the easiest to order anyway.

That leaves the average more expensive dinner. Normally - dinner is anywhere from 800 yen to 10,000 yen plus.

My guess is you'll spend probably 3000 yen a day but have a kaseki dinner or two if you want to splurge from time to time....

Also, is there a big difference between eating in Tokyo and Kansai? (cost wise)

No, they are pretty much the same cost wise.

Thanks guys!

I already thought 5000 would be more than enough, but I like to feel financially "save" when I travel. It's always better to find out that you need to spend less rather than more than you thought.

Ah, I definitely wanna try a kaiseki dinner in Kyoto and/or Miyajima.