What is the standard rice-to-water ratio?

For long-grain white rice on the stove the most common ratio is 1 cup of rice to 2 cups of water (1:2 by volume). However this is not universal — basmati and jasmine rice need only 1:1.5 to 1:1.75 because they absorb less water, while brown rice needs 1:2.25 because the bran layer is less permeable. This calculator stores verified ratios for 13 varieties so you get the right number without guessing.

Why does a rice cooker need less water than stove-top?

A sealed rice cooker traps the steam inside the pot so very little water escapes as vapour during cooking. On the stove, steam escapes continuously from under the lid, meaning more water is lost before the rice is done. As a rule of thumb, reduce the water by roughly 0.25 cups per cup of rice when switching from stove to rice cooker.

How do I adjust the water ratio at high altitude?

Above roughly 900 m (about 3,000 ft) water boils at a temperature below 100 degrees C. This means rice absorbs heat more slowly and steam escapes faster, so the rice can finish cooking before all the water is absorbed — leaving it crunchy. The standard fix is to add 1 tablespoon (about 15 mL) of extra water per cup of rice for every 300 m you are above 900 m. Enter your altitude in the calculator and it applies this correction automatically.

Should I rinse rice before cooking?

Rinsing removes excess surface starch (and any residual dust from milling or transport). For varieties like basmati where fluffy, separate grains are the goal, rinsing until the water runs clear makes a noticeable difference. For sushi rice you still rinse but stop just before fully clear — you need some starch for the grains to stick together. For risotto rice (arborio), do not rinse because the surface starch is what creates the creamy sauce.

Does the ratio change if I soak the rice first?

Yes. Soaking pre-hydrates the grains so they need less water and time during cooking. A 30-minute soak for basmati or jasmine lets you reduce water by about 2 tablespoons per cup. Brown rice or wild rice benefit from a longer soak (30 to 60 minutes) which can cut cook time by 10 to 15 minutes. The ratios in this calculator assume unsoaked rice — if you soak, reduce water slightly and check for doneness a few minutes early.

How do I measure rice in grams instead of cups?

Dry white rice (long-grain) weighs approximately 185 g per US cup. Brown rice is denser at around 195 g per cup. This calculator accepts grams directly: switch the input unit to grams, enter your weight, and the equivalent cup volume is calculated internally before the water ratio is applied. The worked example: 370 g of basmati equals 2 cups, so at a 1:1.75 ratio you need 3.5 cups (about 828 mL) of water.

Rice Water Ratio Calculator

Getting the rice-to-water ratio right is the single biggest variable between fluffy, separate grains and a sticky or crunchy disappointment. Unlike pasta, which you drain, rice absorbs all its cooking water — so the volume you add at the start is the volume the cooked grain will contain. Too little and the rice is chalky in the middle; too much and it turns to mush. The ratio that works also depends on the cooking method (stove, rice cooker or microwave) and, if you live at altitude, on how far above sea level you are.

This calculator stores research-backed ratios for 13 rice varieties, converts between cups, grams and ounces on the input side, converts the water result to cups, millilitres or litres on the output side, and applies the standard high-altitude correction automatically.

How it works

The core formula

Water needed is simply:

water_cups = rice_amount_cups * ratio + altitude_correction

The ratio is the water-to-rice ratio by volume for the chosen variety and cooking method. For example, basmati on the stove has a ratio of 1.75 — meaning 1.75 cups of water per 1 cup of dry rice.

Unit conversion

If you enter rice in grams, the calculator converts to cups first:

rice_cups = grams / 185

(185 g/cup is the standard figure for dry long-grain white rice.) For ounces the divisor is 6.5 oz/cup. All further calculations use the cup value.

Altitude correction

Water boils at a lower temperature above sea level, which means the rice absorbs heat more slowly and steam escapes faster. The accepted correction (from the USDA and major rice cooker manufacturers) is:

extra_water = rice_cups * floor((altitude_m - 900) / 300) * (1/16)

One US tablespoon = 1/16 of a cup. So for every 300 m above 900 m, add one tablespoon per cup of rice. At 1,500 m (Addis Ababa, Nairobi) that is 2 tablespoons per cup — enough to matter for a 3-cup batch.

Cooking method adjustment

Rice cookers trap steam, so they need roughly 0.25 cups less water per cup of rice than stove-top. Microwave cooking is open (some steam escapes through the vented lid) and the heating pattern is less even, so it typically needs about 0.25 cups more than stove-top.

Worked example

You want to cook 370 g of basmati rice in a rice cooker at sea level.

Convert to cups: 370 / 185 = 2 cups of rice
Rice cooker ratio for basmati: 1.5
Water needed: 2 x 1.5 = 3 cups (about 710 mL)
Altitude correction (sea level): 0
Result: 3 cups of water, cook time ~15 min, then rest off heat for 5 min

If the same person lived in Bogota, Colombia (2,600 m):

extra = 2 cups * floor((2600 - 900) / 300) * (1/16)
      = 2 * 5 * 0.0625
      = 0.625 cups extra

Total water: 3 + 0.625 = 3.625 cups (≈ 857 mL) — almost an extra three-quarters of a cup.

Rice type	Stove ratio	Cooker ratio	Microwave ratio	Stove time
Basmati	1 : 1.75	1 : 1.50	1 : 2.00	~18 min
Jasmine	1 : 1.50	1 : 1.25	1 : 1.75	~15 min
Long-grain white	1 : 2.00	1 : 1.75	1 : 2.25	~18 min
Brown (long)	1 : 2.25	1 : 2.00	1 : 2.50	~45 min
Sushi rice	1 : 1.25	1 : 1.10	1 : 1.50	~15 min
Wild rice	1 : 3.00	1 : 2.75	1 : 3.25	~55 min

All ratios are rice : water by volume using US cups.

Every calculation runs entirely in your browser — nothing is sent to a server.