That little cup you get with a rice cooker is 180ml, 3/4 of a cup, a unit called a Go.

One go is 1/1000th of a koku, the amount of rice needed to feed one person for one year.

One koku is 180.4 liters, or about 40 gallons.

https://en.m.wikipedia.org/wiki/Koku 
One liter of dry white long-grained rice has 2,853 calories.

Thus one koku is 513,540 calories per year.

1,406 per day
1 koku of white rice weighs about 150kg, or 330lbs.
Feudal estates were measured in koku, it was a basic economic unit.

The economy was measured in, literally, how many people it could keep alive.
This is interesting.

Right now, how many koku do you have?
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