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I have a cheap-o rice cooker that works fine for me. It came with a plastic cup to measure 1, 2 or 3 "plastic cup" units of rice. Water is added to match the '1', '2' or '3' mark in the cooker bowl. It was great until the cup vanished.

Now how to pour in the right amount of rice?

Do all rice cookers use the same standard "plastic cup" unit? By any luck, would it be exactly 1 cup, or 1/2 cup, according to a standard measuring cup? Maybe I could dump rice and water into the bowl in any amount as long as they're in the right proportion by volume. Meeting the '2' or '3' mark isn't important, actually, just getting great rice in the end.

The actual model I'm using is CKRVRCM061 and yes, of course I could google it, but it would be great to have a general answer which could apply to any cooker I or anyone will use in the future - for those of us with a talent for losing small important items!

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It's always the ratio that matters, never the absolute amount. See Proper ratio of Water to Rice Also, your question title is definitely inviting "google it" answers/comments; if you want a general answer then you should make it clear that it's a general question, not specific to your model personally. –  Aaronut Mar 26 '13 at 1:12
    
I think your title is a large part of the problem with your question. "How do I get the right amount of rice?" is the real question (you don't actually need to know how big the plastic cup was), and that's answered by the question Aaronut linked to, right? –  Jefromi Mar 26 '13 at 2:01

5 Answers 5

up vote 8 down vote accepted

Assuming you bought a rice cooker designed by a Japanese company (and apparently even other brands tend to meet that market's expectations), the measurement is 1-gou, slightly more than 180ml, which is traditionally the size of a sake cup, and is closely associated with a historical sake bottle size (approximately 1.8l)

http://en.wikipedia.org/wiki/Masu_(Japanese)

It turns out that this amount, 1 gou of dried rice, neatly corresponded to a typical daily serving of rice. In practice, most contemporary Japanese eat about 1.5-2 gou per day; 1 gou of dried rice cooks up enough for 2 Japanese adults for one meal if you have several side dishes. There are other measurements that derive from the gou (or perhaps the other way around), such as the koku, which was considered the amount of rice that a single person would consume over the course of a year.

This is one of the human-centric forms of measurement that has survived the metric push; you can find various examples of this in many otherwise metric-converted countries. It turns out some studies show that those metrics often make certain categories of estimation easier for people.

Edited to cover the concern about matching the right amount of water:

It's worth noting that you don't need perfect precision for the amount of water, as long as you cook with the full cycle and not one of the express cooking modes. I can't remember the exact scientific principle behind it, but perhaps something to do with osmotic pressure. Some people use the remarkably effective method of measuring a certain amount of space between the dried rice and the water based on the size of their forefinger segment or thumbnail. It apparently works well for almost any imaginable size of pan (though you can have other problems with a pan too wide to have the rice cover the bottom). (Some types of rice do prefer more water than others, but within a single type, you have a fairly flexible range for the water ratio)

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Your rice cooker is probably metric, so I'd think in terms of milliliters rather than cups. Now if it were me, I'd use the link in @Aaronut's comment to make rice and forget about it, however if you want a pretty good estimate then simply measure out how much water it takes to fill to the 1 line, then divide it by 3. Again, use ml, it's much more precise.

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If you measure the water before you put it in, you can use internet recipes or general ratios to calculate how much to put in. Once the little cup is lost, you may as well just forget about the lines and use standard cup measurements.

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The plastic cup that came with my rice maker was 180 ml (3/4 cup). It's an odd size, but that's the standard.

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Does a cup with three lines suggest 60, 120, 180 mL or 180, 360, 540 mL? (Also this is ridiculous.) –  Jefromi Mar 26 '13 at 16:31

I have an Aroma brand cooker (Got Rice GRC-003) and also lost the measuring cup. Their site tells you if you ever lose the cup, use a standard 3/4 cup and observe the water marks in the pot.

http://www.aroma-housewares.com/kitchen/appliances/rice101/21/Rice%20Measuring%20Cup.html

Hope this helps.

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