How to Cook Rice in a Rice Cooker
One cup of rice to one cup of water — 1 : 1 — using the small cup that came with the machine. Or skip the numbers entirely: put in however many cups of rice, then fill to the line in the bowl marked with that same number. Press start, and give it another five minutes on warm before you open it. White rice runs about 20–30 minutes depending on the machine and the amount; brown takes considerably longer.
A rice cooker is a sealed bowl with a thermostat. It traps steam the whole way through, which is why it needs roughly half the water the stove does — and why the ratio that matters here is not the one printed on a bag of rice for a saucepan. See the rice to water ratio for how the two compare side by side.
The ratio: 1 : 1, and why it is that low
One of the cooks below puts it plainly, and directly against the other number you will see online: “I’ve seen different ratios, some people use like half a cup of water per cup of rice, but I’m going to be using one cup of water for every cup of rice.” 1 : 1 is the number, and the half-cup version is the one that produces rice that is dry in the middle.
The reason is the lid. A saucepan loses steam for the entire simmer, so it has to start with that lost water already in the pot. A rice cooker returns it. Nothing escapes, so the water you pour in is the water the rice has to live with — and it needs about half as much.
Use the cup that came with it. That little cup is not a US cup — it holds about 180 ml, roughly three-quarters of the 240 ml US cup. This matters less than people think, because 1 : 1 is a ratio: the same cup on both sides gives the same rice. It only breaks if you measure rice with one cup and water with another. The full cup comparison is on the grams page.
The easier way: forget the cup, use the lines
Every rice cooker ships with a cup and a set of notches up the inside of the bowl, and two of the three cooks below use them exclusively. The whole method:
- Rinse the rice, then drain it well in a sieve.
- Tip it into the bowl. Count the cups as they go in — four cups of rice, say.
- Fill to the notch with that same number. Four cups of rice, fill to line 4. That is it; you have not measured any water.
- Lid on, press cook. When it is done it will click over to warm by itself.
- Leave it five minutes on warm, then fluff with the paddle so the grains separate.
This is why the lines exist: the manufacturer already worked out the ratio for that machine’s bowl, and printed it in plastic. Matching cups to lines is the same 1 : 1, arrived at without arithmetic. It is also the version that survives scaling — five cups of rice goes to line 5, and you never convert anything.
What cooks who use one every day actually do
| Cook | How they measure | Ratio |
|---|---|---|
| One cook | Uses the cooker’s cup and the notches in the bowl | cups to lines — “you match your cups to the lines inside of your rice cooker” |
| Another cook | Measured cups, one for one | 1 : 1 — “one cup of rice grain to one cup of water” |
| A third cook | Rinse, sieve, then match cups to notches | cups to lines, then “leave it five minutes after cooking, then fluff” |
Two of the three do not measure water at all. They rinse, drain, count the rice in, and fill to the line. That is the method worth learning if you own a rice cooker — the ratio is baked into the bowl.
How long does a rice cooker take?
Longer than the button suggests, and the display confuses people. A typical white-rice cycle runs about 20–30 minutes from cold, depending on the machine and how much rice is in it. Two things about the clock:
- It is mostly coming to a boil. The cooker spends a good part of that time heating the water up before the absorption even starts. More rice means more mass to heat, so bigger batches take longer — but not proportionally.
- The countdown lies. On a display model, the number showing is a rough estimate that revises itself as it goes — one cook watches theirs drop from ten minutes to six as the pot heats. The machine finishes when it finishes, and the signal that matters is the click over to warm, not the number on the screen.
| Rice | Approximate cycle | Notes |
|---|---|---|
| White long-grain | 20–30 minutes | Scales with quantity, mostly through the heat-up |
| Jasmine | 20–30 minutes | Same machine cycle; see jasmine water ratio |
| Brown | Considerably longer | The bran slows water down — see below |
Brown rice in a rice cooker
Same ratio, longer clock. Brown rice still has its bran, and that bran slows water down, so it needs a longer cycle rather than more water — 1 : 1 still holds in a rice cooker, exactly as it does for white.
- Use the brown rice setting if your machine has one. It runs a longer, gentler cycle, which is what the grain actually wants.
- If it has no setting, use the lines anyway and expect the plain white cycle to leave it underdone. Give it a soak first — 30 minutes to an hour — and drain well before it goes in.
- Rest it longer at the end. Brown benefits from a good 10 minutes on warm before you open it.
The full comparison of brown across stove, cooker and pressure cooker is on the brown rice page.
Five mistakes that account for most bad batches
- Measuring rice with one cup and water with another. The cooker’s cup is 180 ml, a US cup is 240 ml. Use one or the other on both sides — or use the lines and stop measuring.
- Opening it the moment it clicks to warm. The rice is still finishing. Five to ten minutes with the lid down is the difference between grains that separate and a wet top over a firm middle.
- Pouring a stovetop ratio into the bowl. 1 : 2 in a sealed cooker is rice soup. The cooker needs about half what an open pot does.
- Scraping the bottom with a metal spoon. Most cooker bowls have a non-stick surface. Use the paddle that came with it.
- Judging it by the countdown. The number on the display is an estimate that revises itself. Wait for the click to warm.
Where the numbers on this page come from. The 1 : 1 ratio and the cups-to-lines method come from cooks describing how they use their own machines — home-kitchen practice, not a manufacturer’s specification, and the two agree because the lines are printed at that same ratio. The 20–30 minute cycle and the behaviour of the countdown are typical display-model behaviour, and will vary by machine and batch size; treat them as a range, and use the click to warm as the real signal. The 180 ml cooker cup and 240 ml US cup figures are this site’s own reference points.
Common questions
How much water do you put in a rice cooker?
One cup of water per cup of rice, using the cooker’s own cup — or skip it and fill to the line in the bowl that matches the number of cups of rice you added.
What is the rice cooker water ratio?
1 : 1. That is about half what the stove needs, because a sealed cooker does not lose steam the way an open pot does.
How long does a rice cooker take?
About 20–30 minutes for white rice, longer for brown. The display countdown is an estimate that changes as it heats — the real signal is the click over to warm.
Do I have to use the cup that came with it?
It is easiest, because the bowl’s lines are calibrated to it. But any cup works as long as you use the same one for rice and water.
Can I cook brown rice in a rice cooker?
Yes — same 1 : 1 water, longer cycle. Use the brown rice setting if it has one, or soak the rice first if it does not.
Why does it switch to warm early?
It has not finished; it has finished boiling. The rice is still absorbing. Give it five to ten minutes on warm before you open it.
Should I use the numbers inside the bowl?
Yes, if your machine has them — they are the manufacturer’s own ratio, printed in the bowl, and they remove the measuring entirely.
The takeaway
Rinse, drain, count the rice in, and either match it cup for cup with water or fill to the line with the same number — they are the same 1 : 1, and the lines are easier. Press start, ignore the countdown, wait for the click to warm, then give it five more minutes before you open it. Use the paddle, not a metal spoon. If you take one thing from this page: a rice cooker needs half the water a saucepan does, and the machine tells you when it is done — not the screen, the click.