Rice Cooker Measuring Cup: How Big Is It? (180 ml vs a Regular Cup)
A rice cooker cup holds 180 ml, which is ¾ of a US measuring cup (240 ml) or about 6 US fluid ounces. It is the traditional Japanese rice measure, called a gō, and holds roughly 150 g of uncooked rice.
Use the rice cooker cup to measure the rice, then fill water to the matching line in the pot. If you lose the cup, use a ¾ US measuring cup instead.
- Rice cooker cup: 180 ml. US cup: 240 ml. So one rice cup is ¾ of a US cup.
- The numbered water lines in the pot are designed for rice measured with the 180 ml cup.
- One rice cup of raw rice makes about two cups of cooked rice, or about 2 servings, according to Aroma.
- Rice cooker sizes such as “10 cups” can mean cooked rice (Aroma) or uncooked rice cups. Check the listing.
- Do not mix cups: measure rice and use the lines, or measure both rice and water with the same standard cup.
How big is a rice cooker cup?
Aroma explains that the standard rice measuring cup is 180 ml. It is the same amount as a gō in Japan, a ge in China and a hop in Korea. A US measuring cup holds 240 ml, so a rice cup is a quarter smaller.
Panasonic’s help pages give the same figure for the cup supplied with its rice cookers: about 180 ml. That is why most rice cookers sold in the US come with a cup that looks oddly small.
Rice cooker cup vs regular cup
| Measure | Rice cooker cup | US measuring cup |
|---|---|---|
| Volume | 180 ml | 240 ml |
| US fluid ounces | About 6.1 fl oz | 8 fl oz |
| In US cups | ¾ cup | 1 cup |
| Uncooked rice weight | About 150 g (Aroma) | About 200 g |
| Cooked yield | About 2 cups cooked, 2 servings | About 2⅔ rice cups cooked |
Rice weight varies a little by variety and age, so treat the gram figures as a guide.
Rice cooker cup conversion chart
| Rice cooker cups | Milliliters | US cups | Approx. uncooked weight |
|---|---|---|---|
| 1 | 180 ml | ¾ cup | 150 g |
| 2 | 360 ml | 1½ cups | 300 g |
| 3 | 540 ml | 2¼ cups | 450 g |
| 4 | 720 ml | 3 cups | 600 g |
| 5 | 900 ml | 3¾ cups | 750 g |
| 6 | 1,080 ml | 4½ cups | 900 g |
How to measure rice for a rice cooker
- Measure the rice with the rice cooker cup. Scoop, then level the top with a finger or chopstick. Do not pack it.
- Rinse in the pot or a sieve. Rinse until the water is mostly clear, then drain well.
- Level the rice. Spread the rice flat in the pot so you can read the water line accurately.
- Add water to the matching line. For 2 cups of rice, fill to line 2 for that rice type. Aroma calls this the water line method.
- Cook. Choose the setting for that rice type and press Start.
Do you use the rice cooker cup for water too?
Usually no. The water lines already account for the right amount, so you only measure the rice. If your pot has no lines, use the same cup for both rice and water, and follow the ratio in your manual or on the rice package.
The common mistake is measuring rice with the small rice cup and water with a US cup, or the other way round. That throws the ratio off by about a third and gives mushy or hard rice.
What a “cup” means in a rice cooker’s size
Rice cooker sizes are confusing because brands use different cups. Aroma says its cookers advertise the finished capacity, such as “10 cups cooked”. Many Japanese brands list the maximum uncooked capacity instead, such as “5.5 cups”, measured with the 180 ml cup.
| Listed size | Likely meaning | Feeds about |
|---|---|---|
| 3 cups | Uncooked rice cups | 1 to 3 people |
| 5.5 cups | Uncooked rice cups | 2 to 6 people |
| 10 cups | Uncooked rice cups (Japanese brands) | 6 to 10 people |
| 8 to 20 cups cooked | Cooked rice (Aroma style) | About half that many rice cups uncooked |
What if you lose the rice cooker cup?
- Use a ¾ US measuring cup. Aroma recommends this as the substitute.
- Use a kitchen scale. Weigh about 150 g of rice per rice cup.
- Buy a replacement. Most brands sell genuine replacement cups and paddles by model number.
Recipes that use rice cooker cups
When a recipe written for rice cookers says “2 cups of rice”, it usually means two 180 ml rice cups. When a recipe for the stove says cups, it means US cups. Our guides say which cup to use:
Frequently asked questions
How many ounces is a rice cooker cup?
About 6.1 US fluid ounces. A rice cooker cup is 180 ml, and a US cup is 8 fluid ounces (240 ml).
Is a rice cooker cup the same as a regular cup?
No. A rice cooker cup is 180 ml, which is ¾ of a 240 ml US measuring cup.
Can I use a regular measuring cup in a rice cooker?
Yes, if you use it for both rice and water and ignore the pot lines, or if you use ¾ of a US cup per rice cup and keep using the lines.
Is the clear plastic cup for rice or water?
For rice. The water is measured using the numbered lines inside the inner pot, which match that cup.
Are rice cooker measuring cups accurate?
They are accurate enough for the matching water lines, as long as you level the rice and do not pack it. A scale at about 150 g per cup is more precise.
How much cooked rice does one rice cooker cup make?
About two cups of cooked rice, or around 2 servings, according to Aroma.
The bottom line
A rice cooker cup is 180 ml, or ¾ of a US cup. Measure rice with it, add water to the matching line, and do not mix cup types. If you lose it, a ¾ US cup or 150 g of rice does the same job.
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