Rice to Water Ratio: Why the 1:2 Rule Turned My Jasmine Rice Into Porridge
For about ten years I cooked every rice the same way: one cup of rice, two cups of water, lid on, hope for the best. It worked fine for the cheap long-grain I grew up on. Then I bought a bag of jasmine for a Thai curry night, used my trusty 1:2, and served eight people a pot of sticky, waterlogged porridge. Somebody politely called it "congee-adjacent". The problem wasn't my stove or my pot. It was the ratio, which I'd never questioned.
This guide is for anyone who cooks rice a few times a week and has ever ended up with mush or crunch. By the end you'll know the rice to water ratio for each common type, why a rice cooker and an Instant Pot need less water than a pot, and how to scale the water for any amount of rice.
Quick Answer: Rice to Water Ratio
Long-grain white rice and parboiled rice use 1 part rice to 2 parts water by volume. Jasmine, basmati and medium-grain use 1 : 1.5, sushi rice about 1 : 1.1, brown rice 1 : 2.25. Sealed cookers need 10–20% less water. The Rice to Water Ratio Calculator does the maths for any rice, amount and method.
Why Does the 1:2 Rice to Water Ratio Fail?
The rice to water ratio is the volume of water added for each volume of uncooked rice, such as 1:2 for one cup of rice and two cups of water. Rice grains absorb water and swell to roughly three times their dry volume, so the ratio decides whether you get fluffy, mushy or hard grains.
The 1:2 rule comes from American long-grain white rice. The USA Rice Federation's standard stovetop instruction is 2 cups of water per cup of long-grain rice, simmered covered for about 18 minutes. That's a perfectly good rule for that rice. It's a poor rule for almost everything else, because other varieties contain different starch and are milled differently, and a covered pot loses almost no water to steam.
Here's my curry-night disaster in numbers. I cooked 2 cups of jasmine, which needs about 3 cups of water. I added 4. That's one extra cup, or 33% too much water, with nowhere to go but into the grains.
Key Takeaway
Rice isn't one ingredient. A single ratio can't suit long-grain, jasmine, sushi and brown rice, which differ by up to a full cup of water per cup of rice.
What Is the Right Rice to Water Ratio for Each Type?
These are stovetop figures for a covered pot, which is the baseline most package instructions use. Rinse the grains first for every white variety.
| Rice | Rice : Water | Simmer time |
|---|---|---|
| White long-grain | 1 : 2 | 18 min |
| White medium/short-grain | 1 : 1.5 | 18 min |
| Jasmine | 1 : 1.5 | 15 min |
| Basmati | 1 : 1.5 | 15 min |
| Sushi / Japanese | 1 : 1.1 | 15 min |
| Parboiled | 1 : 2 | 20 min |
| Brown | 1 : 2.25 | 45 min |
| Wild | 1 : 3 | 50 min |
Japanese short-grain rice is traditionally cooked at about 1:1.1 by volume after a thorough rinse and a 30-minute soak, which is why sushi rice feels so much drier going into the pot than American rice. Brown rice keeps its bran layer, which slows water absorption, so it needs both more water and roughly two and a half times the cooking time of white.
💡 Pro Tip
Measure rice by weight if you can. One US cup of rice is about 185 g, but scooping varies by 10–15% depending on how packed it is, and that alone can swing your ratio. The calculator accepts grams for this reason.
Do You Use Less Water in a Rice Cooker or Instant Pot?
Yes. Water leaves a pot as steam, and how tightly the lid seals decides how much escapes. A stovetop pot with a lid loses a little, an open microwave bowl loses more, and a sealed pressure cooker loses almost none.
The adjustment I use, and the one built into the calculator, is a multiplier on the stovetop water:
| Method | Factor | Water vs stovetop |
|---|---|---|
| Stovetop pot or oven | 1.0 | Baseline |
| Rice cooker | 0.9 | 10% less |
| Instant Pot | 0.8 | 20% less |
| Microwave | 1.1 | 10% more |
Worked example: 2 cups of jasmine rice (about 370 g). The stovetop needs 2 × 1.5 = 3 cups, or roughly 710 ml. In a rice cooker that's 3 × 0.9 = 2.7 cups (about 640 ml). In an Instant Pot it's 3 × 0.8 = 2.4 cups (about 570 ml), and the cooking time drops to around 5 minutes under pressure. Either way you end up with about 6 cooked cups, enough for eight servings at three-quarters of a cup each.
⚠️ Note
Most rice cookers come with their own measuring cup, which holds about 180 ml, not a US cup (237 ml). If you use the cooker's cup for rice, use the water lines inside the bowl and ignore any cup-based ratio.
How Do You Calculate Water for Any Amount of Rice?
Ratios scale linearly up to a point. Three cups of long-grain white rice need 6 cups of water, and six cups need 12. That's simple multiplication. What changes in big batches is the pot: a wide pot loses more steam than a tall one, and a very large batch takes longer to come back to a simmer.
Metric kitchens can do the same thing by weight. Because a cup of rice weighs about 185 g and a cup of water about 237 g, long-grain rice needs roughly 2.5 times its weight in water on the stovetop. So 300 g of rice needs about 770 ml, while the same weight of jasmine needs about 580 ml. The calculator reports both cups and millilitres so UK, Australian and US cooks all get a usable number.
If you're scaling a whole recipe, not just the rice, the Recipe Scaling Calculator keeps everything in proportion, and the Cooking Time Calculator helps you work backwards from when dinner needs to be on the table.
Rice Mistakes That Aren't About the Ratio
Once I fixed the ratio, three other habits turned out to matter nearly as much:
- Lifting the lid. Every peek lets out steam and drops the temperature. Set a timer and leave it.
- Skipping the rest. Take the pot off the heat and let it sit, covered, for 10 minutes. The moisture redistributes and the grains firm up.
- Leaving cooked rice out. The UK Food Standards Agency advises eating rice soon after it's cooked and cooling leftovers within an hour, because Bacillus cereus spores survive cooking and can multiply at room temperature. Refrigerate and reheat until steaming hot.
This does vary. Older rice absorbs more water than a fresh harvest, altitude lengthens cooking, and some brands are pre-washed. Treat the ratio as a starting point and adjust by one or two tablespoons per cup after your first batch.
Frequently Asked Questions
What is the water to rice ratio for white rice?
For long-grain white rice on the stovetop it's 1 part rice to 2 parts water by volume. Medium-grain, jasmine and basmati use about 1:1.5.
How much water do I need for 1 cup of rice?
Two cups for long-grain white, 1.5 cups for jasmine or basmati, about 1.1 cups for sushi rice and about 2.25 cups for brown rice. Reduce by 10% in a rice cooker and 20% in an Instant Pot.
Does rinsing rice change how much water I need?
Rinsing removes surface starch for separate, fluffier grains. It leaves a little water clinging to the rice, so drain well in a sieve. You don't need to change the ratio.
Why is my rice always mushy or crunchy?
Mushy rice usually means too much water for that variety, or peeking and stirring. Crunchy rice means too little water or heat that was too high, so the pot dried out before the grains softened.
How much cooked rice does 1 cup of dry rice make?
About 3 cups for most varieties and roughly 2.5 cups for sushi rice. That's around four servings at three-quarters of a cup each.
Try It Yourself
The 1:2 rule isn't wrong, it's just one answer to a question with eight. Pick your rice, pick your cooker, and let the numbers decide. Enter your rice type, amount and method into the Rice to Water Ratio Calculator and you'll get water in cups and millilitres, simmer time and total servings. Cooking for a crowd? Try the Recipe Scaling Calculator, or if you're cooking the rest of the dinner too, the Turkey Cooking Time Calculator and Air Fryer Conversion Calculator are handy companions.
