A six-cup rice cooker does not make six cups of rice

Rice cooker capacity is one of the most reliably confusing numbers in the kitchen. A “6-cup” cooker does not hold six US cups, and it does not produce six cups of rice. Both halves of that sentence catch people out.

The two things the number is not

It is not a US cup. The rice industry standard cup — the plastic scoop supplied with the machine — is 180 millilitres, or about three-quarters of a US cup. This convention comes from the Japanese gō and it has stuck across the whole category.

It is uncooked rice. Rice roughly doubles to triples in volume as it cooks. A 6-cup cooker takes six of those 180 ml scoops of dry rice and produces around twelve to eighteen cups of cooked rice.

Put together: a 6-cup cooker makes enough rice for roughly six to eight people as a side dish. It is considerably larger than it sounds.

Choosing a size

• 3-cup. One or two people. Small enough to leave out, and quick.
• 6-cup. The household default. Comfortable for a family of four with leftovers.
• 10-cup and above. Large families, batch cooking, or anyone who freezes portions.

There is a minimum as well as a maximum. Most cookers do not perform well below about a third of their rated capacity — the sensor is calibrated for a certain thermal mass, and a single scoop in a large machine tends to come out dry. If you usually cook small amounts, a smaller cooker gives better results than a large one used lightly.

How the machine knows when to stop

Simple cookers use a magnetic thermostat. While free water remains, the contents cannot exceed 100°C. When the water is absorbed, the temperature rises past that point, a magnet loses its hold, and the switch releases to “warm”. It is elegant, entirely mechanical, and it is why cheap rice cookers are so reliable.

Micro-computerised or “fuzzy logic” models measure temperature over time and adjust power to suit different grains, which is what allows brown rice, porridge and mixed-grain settings to work properly.

Which features earn their place

Worth having

• A steamer basket. Vegetables or fish above the rice, cooked in the same cycle. Genuinely useful, and it is the difference between a rice cooker and a one-pot meal.
• Keep-warm. Almost universal, and the reason a rice cooker suits staggered mealtimes.
• A brown rice setting, if you eat it. Brown rice needs a longer soak and a longer cook; a plain cooker does it badly.
• A removable, washable inner lid. Starchy condensate collects there, and a fixed lid is unpleasant within a month.

Less important

Preset menus beyond the grains you actually cook, and delay timers — useful in principle, and rice sitting in water for hours in a warm kitchen is not ideal.

The non-stick pot

The inner pot is coated, and it is the part that wears out. Two habits ruin it fastest: stirring with a metal spoon, and washing it with an abrasive pad. Use the plastic paddle supplied and a soft sponge.

Before buying, check whether replacement inner pots are sold for the model. A cooker with a worn pot and no replacement available is finished, and the mechanism will usually still be perfect.

Getting better rice out of it

1. Rinse the rice until the water runs mostly clear. This removes surface starch and is the difference between separate grains and a sticky mass — unless sticky is what you want.
2. Use the machine’s own scoop and its water lines. The graduations inside the pot are calibrated to that scoop, and mixing units is the usual cause of wet or dry results.
3. Let it rest. Ten minutes on keep-warm after the cycle ends allows the moisture to even out through the grain. Opening the lid immediately gives you wet rice on top and firm rice underneath.
4. Fluff, do not stir. Lift and separate with the paddle.

What else it does

Quinoa, oats, polenta, steamed puddings and soups all work. Some people cook whole meals in them. The limitation is that a rice cooker has one temperature behaviour and no browning, so anything needing a sear happens in a pan first.

Before you order

Decide by how much rice you cook on a normal weeknight, in scoops rather than in servings, and then check the external dimensions against your worktop. Our listings state both the cup rating and the equivalent volume of cooked rice, because those two numbers are what people are actually choosing between.

Common questions

How much cooked rice does a 6-cup cooker make?

Roughly twelve to eighteen US cups of cooked rice — enough for six to eight people as a side. The rating refers to six 180 ml scoops of dry rice, not to US cups and not to the cooked volume.

Can I use my own measuring cup?

You can, but the water lines inside the pot are calibrated to the scoop supplied with the machine. Mixing units is the usual reason rice comes out too wet or too dry.

Should I rinse rice before cooking?

For separate grains, yes — rinse until the water runs mostly clear to remove surface starch. If you want sticky rice, rinse less.

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