The exact water-to-rice ratio, simmer time, and rest for white, basmati, jasmine, and brown rice.
Rice is the world’s most cooked grain and one of its most quietly ruined. Too much water and it turns to porridge; too little and the bottom scorches while the top stays chalky. The fix is embarrassingly simple — a ratio — but it changes with the rice: white long-grain wants 1 part rice to 1.5 parts water, jasmine a touch less, brown a full double. Our free Rice Water Ratio Calculator does the arithmetic for any amount of any of the four everyday rices, and adds the simmer time and the resting step most boxes print too small to read.
The default tells the classic story: 2 cups of white long-grain rice needs exactly 3 cups of water, 18 minutes under a lid, and 5 minutes of rest. Scale it, switch the rice, and the calculator re-derives everything — water to the quarter cup, cook time, rest, even the salt.
Below the calculator: how to use it, why different rices drink different amounts of water, the ratio formula with two worked examples, real dinner-party scenarios, the five mistakes behind every gummy pot, and the questions rice cooks actually ask.
A grain of rice is mostly starch, and starch granules swell as they absorb hot water — but the details differ by variety. Amylose, the long straight starch molecule, makes grains cook up separate and fluffy; amylopectin, the branched one, makes them sticky. Long-grain whites are high in amylose and need moderate water; jasmine has a touch more amylopectin and famously soft grains, so it wants slightly less water to avoid mush; basmati’s extra-long grains need the water to fully hydrate their length.
Brown rice is the outlier because it still wears its bran coat. That fibrous jacket slows water penetration dramatically, so brown rice needs twice its volume in water and 45 minutes of simmering instead of 15–18. It also benefits from the full 10-minute rest, which lets moisture equalize between the chewy exterior and the tender interior. Skip the rest and the top grains eat chalky.
The absorption method — the one this calculator assumes — works because the ratio is exact: every drop of water ends up inside a grain or as steam under the lid. That is why lifting the lid is sabotage: escaping steam is water leaving the equation, and the ratio silently breaks. Pasta-style boiling in excess water is a different technique entirely (common for basmati in Indian cooking, where the grains are then drained); the calculator’s ratios are for the covered-pot method.
Rinsing matters more than most boxes admit. Surface starch on the grains becomes the glue of gummy rice; a quick rinse until the water runs mostly clear removes it. Basmati and jasmine especially reward rinsing — and a 20-minute soak for basmati lets the long grains hydrate evenly, shortening the effective cook. The calculator’s times assume rinsed, unsoaked rice; soaked basmati can finish a few minutes early.
Key terms:
These ratios assume the absorption method at sea level in a heavy pot with a tight lid. A loose lid bleeds steam and effectively raises the needed water; high altitude lowers water’s boiling point, so grains simmer longer and may want an extra splash. The ratios scale linearly — that is the whole point of a ratio — so halving or tripling a recipe is exact, not approximate.
The default and the most cooked pot in America: 2 cups white long-grain.
Yield: about 6 cups cooked — the 1:3 dry-to-cooked rule. The widget shows “3 cups of water” in big type because that is the number people actually need mid-recipe.
Sunday meal prep: 1.5 cups of brown rice for the week’s grain bowls.
Note the trap this example avoids: treating brown rice like white rice. Same 3 cups of water as example one, but 45 minutes instead of 18 and double the rest — the bran changes everything.
Scenario one: dinner party for eight. You need about 6 cups cooked rice, so 2 cups dry white. The calculator confirms 3 cups water, 18 minutes, 5 rest. You start the pot when guests sit for appetizers; it rests while you plate the main. Timing rice to the meal — not the other way around — is the entire skill.
Scenario two: fried rice worth eating. The secret is day-old jasmine: cook 2 cups dry (2½ cups water, 15 minutes, 5 rest), spread on a tray, refrigerate overnight. Cold, dried-out grains fry up separate and crisp instead of steaming into mush. Fresh rice makes sad fried rice; the calculator plus one night in the fridge makes great fried rice.
Scenario three: the grain-bowl week. Three cups dry brown rice → 6 cups water, 45 minutes, 10 rest → about 9 cups cooked. Portioned into five containers with roasted vegetables and a protein, it is lunch through Friday. Brown rice’s chew is a feature here — it holds up for days where white would go gummy.
Scenario four: basmati for curry night. Two cups basmati, rinsed well: 3 cups water, 15 minutes, 5 rest. The long grains stay separate and catch the sauce instead of dissolving into it. A 20-minute soak beforehand makes them even more dramatic — just shave a couple of minutes off the simmer.
Rice feeds more humans than any other crop — roughly half the planet gets a substantial share of calories from it, and global production tops 500 million tons a year. Domesticated in Asia’s river valleys thousands of years ago, it spread along trade routes until it anchored the cuisines of three continents. The ratio on this page is a tiny piece of arithmetic standing on top of ten millennia of agriculture.
The famous “knuckle method” — water to the first knuckle above the rice — is a ratio in disguise, and it works because finger proportions scale with the pot. But it assumes a specific pot width and rice depth; the cup ratio is the version that survives any vessel. When a recipe says “use the knuckle method” and your pot is wide and shallow, the ratio wins.
Rice cookers earned their place by removing the two variables cooks mishandle: heat control and lid discipline. Basic models are just a thermostat that flips when the water is gone; fuzzy-logic models adjust through the cycle. But a cooker still needs the right ratio in the bowl — garbage in, mush out. The calculator’s numbers work identically in a pot or a machine.
One pattern worth internalizing: rice cookery is ratio plus discipline — exact water, a lid that stays shut, and a rest you do not skip. Every gummy or scorched pot traces back to one of those three, and the calculator hands you the first on a plate.
Rice water ratios (absorption method, covered pot): white long-grain 1:1.5 (18 min simmer, 5 min rest), basmati 1:1.5 (15 min, 5 rest), jasmine 1:1.25 (15 min, 5 rest), brown 1:2 (45 min, 10 rest). 2 cups white rice needs 3 cups water. Keep lid closed; 1 cup dry yields ~3 cups cooked. Source: Sigma Calculator, Rice Water Ratio Calculator, https://sigmacalculator.net/cooking-calculators/rice-water-ratio-calculator/
Cite this page as: Rice Water Ratio Calculator, Sigma Calculator, https://sigmacalculator.net/cooking-calculators/rice-water-ratio-calculator/
Last updated: October 12, 2026