Grams to Cups for Rice, Oats and Grains: Raw vs Cooked Conversion Guide

A US cup of raw white rice weighs 185 grams (g), a cup of rolled oats weighs 90 g, and a cup of uncooked quinoa weighs 170 g. Every grain has its own grams per cup value, so the conversion is always: cups = grams ÷ grams per cup for that specific grain. The second rule matters just as much: those values apply to raw, dry grain only. Cooked grain holds water and takes up far more space, so a raw conversion and a cooked conversion can never share one number.

This guide compares the common grains side by side, explains why cooked volume is so different, and shows how to convert recipes that mix raw and cooked amounts. For a single quick calculation, the grams to cups converter handles each grain with its own density.

Grams per cup for common grains (raw and dry)

These are the values this site uses for every grain conversion. All are for one level US cup (236.6 milliliters, or ml) of dry, uncooked grain.

The table is intentionally short. Each linked ingredient page has the full set of gram amounts for that grain, so use those pages when you need a specific lookup such as 300 g of lentils or 2½ cups of oats.

Why grains weigh so differently in the same cup

A cup measures space, and a scale measures mass. The space inside a cup is filled partly by grain and partly by air between the pieces. How much of the cup is air depends on the size and shape of each piece, which is why grains that look similar can weigh very different amounts per cup.

Three physical factors explain most of the spread in the table:

1. Piece shape. Rolled oats are flattened flakes that stack at odd angles and trap a lot of air, so a cup holds only 90 g. Steel-cut oats are the same grain chopped into small, chunky pieces that settle closely together, so a cup holds 170 g.
2. Piece length. Basmati grains are long and slender. They cross over each other in the cup and leave slightly more empty space than shorter long-grain white rice, which is why basmati sits at 180 g against 185 g for regular white rice.
3. Outer layers and density of the grain itself. Brown rice keeps its bran layer, and this site lists it at 190 g per cup, 5 g more than white rice. Lentils are small, dense, and rounded, which is why they reach 192 g, the heaviest grain value in the table.

Pasta shows the shape effect most clearly. Small dry shapes weigh about 105 g per cup, but a cup of tiny shapes such as orzo will fill differently from a cup of large, hollow shapes. Long pasta such as spaghetti is not practical to measure by the cup at all, which is why the pasta page describes small shapes only.

Raw vs cooked: two conversions you should never combine

A grams per cup value tells you how much dry grain fits in a cup. Once grain cooks, it absorbs water, swells, and softens. The cup now holds a mix of swollen grains and water that has become part of them. That cooked cup has a different weight and a different volume from the raw cup it came from.

This creates two separate questions:

• Converting a raw amount: grams of dry grain to cups of dry grain. Use the grams per cup value from the table.
• Estimating cooked yield: how many cups of cooked grain a given amount of raw grain will produce. This depends on how you cook it, not on a fixed density.

Keep those steps apart. If you convert 185 g of raw white rice to 1 cup and then treat that as “1 cup of rice” in a recipe that means cooked rice, you will end up with approximately 3 times the rice the recipe expects once it cooks.

How much cooked volume to expect

Published cooking guides give yields as approximate ranges, and they tie the yield to a stated water amount. University of Nebraska-Lincoln Extension gives a general rule that 1 cup of uncooked rice makes about 3 cups of cooked rice. The same page lists 1¾ to 2 cups of liquid per cup of long-grain rice and 2 to 2½ cups for brown rice.

The Whole Grains Council cooking chart lists about 3 cups of cooked grain from 1 cup of dry quinoa (with 2 cups of liquid) and about 3 cups from 1 cup of steel-cut oats (with 4 cups of liquid).

Treat these as practical starting points, not exact conversions. Cooked yield can shift for several reasons:

• Water ratio. More water gives softer, larger grains and a larger yield.
• Cooking method. Absorption cooking keeps all the water in the pot, while boiling and draining pours some away along with surface starch.
• Grain age and variety. Older, drier grain can absorb more water and take longer to soften.
• How you fill the cup afterward. Fluffed cooked rice and rice pressed into a cup give very different readings.

Because of these variables, this site does not publish a fixed grams per cup value for cooked grains. A cooked grams per cup figure from one kitchen describes that kitchen’s pot and water ratio, and it may not match yours.

What happens to the weight

Cooked grain weighs more than the raw grain it came from, because the absorbed water adds mass. A cup of cooked grain, however, usually weighs less than a cup of the same grain raw, because each cooked grain has swollen and holds fewer pieces in the same space. Both statements are true at once, which is why “grams of rice” in a recipe or nutrition log needs a word next to it: raw, dry, uncooked, or cooked.

Converting a recipe that lists cooked grain

Many recipes, such as fried rice, grain salads, and stuffed peppers, list cooked grain in cups. To work out how much raw grain to start with:

1. Take the cooked cups the recipe asks for.
2. Divide by the approximate yield (about 3 for white rice, quinoa, and steel-cut oats, using the sources above).
3. Multiply the raw cups by the raw grams per cup value if you want to weigh it.

For 2 cups of cooked white rice: 2 ÷ 3 = approximately ⅔ cup raw. In grams: ⅔ × 185 = approximately 123 g of raw white rice. Cook a little extra if the recipe cannot tolerate a shortfall, since your yield may be lower than 3 cups.

Rice: white, jasmine, basmati, and brown

Rice varieties sit in a narrow band, from 180 g per cup for basmati to 190 g for brown rice. That 10 g spread is small next to the gap between rice and oats, but it still matters in larger batches.

White and jasmine rice (185 g per cup). Jasmine rice is a long-grain white rice, and it measures the same as regular long-grain white rice on this site. Its aroma does not change how it packs into a cup.

Basmati rice (180 g per cup). The longer, thinner grains leave slightly more air. If a recipe gives basmati in grams, 500 g is 500 ÷ 180 = 2.78 cups, or about 2¾ cups. Using the white rice value instead would give 2.70 cups, a gap of about 1¼ tablespoons.

Brown rice (190 g per cup). The bran layer stays on, and this site lists brown rice at 5 g more per cup than white rice. Brown rice also needs more water and a longer cooking time, as the UNL Extension figures above show, so a recipe written for white rice will not cook brown rice correctly just by swapping the grams.

Short-grain and sushi rice are not listed separately on this site. If a recipe gives a short-grain rice in grams, follow the grams rather than converting through a long-grain value.

Rolled oats vs steel-cut oats

Oats have the largest gap of any grain pair on this site. A cup of rolled oats weighs 90 g; a cup of steel-cut oats weighs 170 g. Steel-cut oats are about 1.9 times heavier by the cup, a difference of 80 g.

That gap has two practical consequences:

• Do not swap the two by volume. Replacing 1 cup of rolled oats with 1 cup of steel-cut oats in cookies or granola adds 80 g more oats, and steel-cut pieces will not soften the same way in a short bake.
• Do not swap them by weight without checking the method. Even at equal grams, steel-cut oats need much more liquid and cooking time. The Whole Grains Council chart lists 4 cups of liquid per cup of steel-cut oats.

Rolled oats are also the grain most sensitive to how you fill the cup. The flakes compress easily, so a cup pressed down firmly can weigh several grams more than a cup filled loosely. Spoon or pour rolled oats into the cup, then level the top without pressing. For recipes that use a small amount, such as ½ cup of oats in a batch of muffins, the difference is minor; for granola by the pound, weighing is more consistent.

Quick oats are not listed on this site. They are cut into smaller pieces than rolled oats, so they can fill a cup differently. Use the recipe’s gram amount or the package’s serving weight when a recipe names quick oats specifically.

Quinoa

Uncooked quinoa weighs 170 g per cup on this site. Quinoa seeds are small and round, so they settle evenly and give fairly repeatable cup readings.

The main measuring trap is rinsing. Many cooks rinse quinoa to remove its bitter coating, and wet quinoa carries water on its surface. Measure or weigh quinoa dry, before rinsing, because the published 170 g value describes dry seeds. A rinsed cup will weigh more and will not match the recipe’s intent.

Example: a salad recipe calls for 250 g of quinoa. 250 ÷ 170 = 1.47 cups, just under 1½ cups of dry quinoa. Using the Whole Grains Council yield of about 3 cups cooked per dry cup, that makes approximately 4.4 cups of cooked quinoa (1.47 × 3).

Lentils, dry beans, pasta, and cornmeal

These pantry staples follow the same rule: the value applies to the dry product as it comes from the package.

Lentils (192 g per cup, dry). Level the cup with a straight edge. Shaking the cup lets small lentils settle and can add weight. 200 g of dry lentils is 200 ÷ 192 = 1.04 cups, just over 1 cup.

Dry beans (185 g per cup, raw). Measure beans before soaking. Soaked beans have absorbed water and fill a cup very differently. A 1 pound (lb) bag is 453.6 g, which is 453.6 ÷ 185 = 2.45 cups of dry beans. Black beans have their own page at 190 g per cup, so check the specific bean when a recipe is precise.

Pasta (105 g per dry cup, small shapes). Pour the pasta in loosely. 100 g of small dry pasta is 100 ÷ 105 = 0.95 cups, a little under 1 cup. Large or irregular shapes will not match this value closely.

Cornmeal (155 g per cup). Cornmeal behaves more like flour than like whole grain, so spoon it into the cup and level it. Cornmeal can settle during storage. 300 g is 300 ÷ 155 = 1.94 cups, which is 2 cups minus about 1 tablespoon.

Rice cooker cups are not US cups

The small cup packed with most rice cookers is a frequent source of confusion. Rice cooker cups commonly hold about 180 ml, based on the traditional Japanese gō measure, while a US customary cup holds 236.6 ml. A rice cooker cup is close to ¾ of a US cup (177.4 ml).

That changes the weight:

• One rice cooker cup of raw white rice: 185 × 180 ÷ 236.6 = approximately 141 g.
• One rice cooker cup of raw basmati: 180 × 180 ÷ 236.6 = approximately 137 g.

The water lines inside a rice cooker bowl are calibrated for the cooker’s own cup. Fill with the included cup when you follow those lines. When a recipe outside the cooker’s manual says “1 cup rice”, it almost always means a US cup, so switch to a standard measuring cup or weigh 185 g.

How to measure grains consistently with a cup

Cup measurements for grains can be reliable enough for everyday cooking if you fill the cup the same way each time. Use these 5 habits:

1. Use a dry measuring cup that you can level flat across the rim, not a liquid measuring jug with a spout.
2. Pour or spoon the grain in until it mounds slightly above the rim.
3. Level the top with the back of a knife or another straight edge.
4. Avoid tapping or shaking the cup, which settles the pieces and adds weight. This matters most for lentils, rice, and rolled oats.
5. Measure before any water touches the grain, including rinsing and soaking.

To see how much your own filling technique varies, you can weigh three separate cups of the same grain filled your usual way. If the three weights sit within a few grams of each other, your cup method is consistent for that grain.

Worked examples: converting grain amounts

Each example uses the formula cups = grams ÷ grams per cup, with the value for the grain’s raw state.

• 100 g of raw white rice: 100 ÷ 185 = 0.54 cups, a little more than ½ cup.
• 50 g of rolled oats: 50 ÷ 90 = 0.56 cups, about ½ cup plus 1 tablespoon.
• 2 cups of dry lentils to grams: 2 × 192 = 384 g.
• 1½ cups of rolled oats to grams: 1.5 × 90 = 135 g.
• 1 tablespoon of raw white rice: 185 ÷ 16 = approximately 11.6 g.
• 1 tablespoon of uncooked quinoa: 170 ÷ 16 = approximately 10.6 g.

For amounts that do not appear here, the converter and each grain’s ingredient page give the result without manual arithmetic.

When to weigh grains and when a cup is fine

A cup is usually fine for:

• Side dishes of rice or quinoa, where a few grams either way only changes the portion slightly.
• Soups and stews with lentils or beans, where liquid can be adjusted during cooking.
• Everyday oatmeal, where you can add water or oats to reach the texture you want.

Weighing is more reliable for:

• Baking with oats, such as cookies, bars, and granola, where oat weight affects texture and spread.
• Recipes written in grams, especially from metric sources, where converting to cups adds rounding.
• Scaled batches, where a small per-cup difference multiplies across several cups.
• Nutrition tracking, where the logged weight must match the label’s stated state (usually dry).
• Recipes that name a grain you do not have, such as basmati replaced with brown rice, where both the grams per cup value and the water amount change.

Whichever you use, write down the state with the number. “185 g rice, raw” and “1 cup rice, cooked” are clear; “1 cup rice” on its own leaves the next cook guessing which conversion applies.