The little cup is part of the system.
Aroma specifies a 180 mL rice cup. Zojirushi uses an approximately 180 mL cup for the NS-TSC10/18 capacity figures. A full kitchen measuring cup can therefore hold substantially more dry rice than the scoop your cooker expects. Aroma’s cup explanation · Zojirushi’s specifications
Start by finding the measurement in your own manual. If it says 180 mL, use that volume of dry rice for one rice-cooker cup. Don’t silently substitute a full kitchen cup because both containers have the word “cup” on them.
That small 237-versus-240 difference is why “three-quarters of a cup” is a useful approximation, not one exact conversion for every measuring set. Three-quarters of 240 mL is 180 mL; three-quarters of 237 mL is 177.75 mL. When the manual gives milliliters, matching that mark avoids the vocabulary problem.
The line is a fill level, not a jug of water.
For Aroma’s water-line method, measure the dry rice, rinse it, put the rice into the inner pot, then add water to the matching line. The rice is already in the pot when you set the water level. Rice type can change the directions, so use the model’s chart rather than treating the white-rice line as universal. Aroma’s measuring instructions
- Measure dry riceUse the cup size your manual specifies.
- Prepare the riceFollow the grain’s rinsing instructions.
- Rice goes in firstThen add water to the specified line.
If the recipe calls for two supplied cups and the relevant “2” line, that does not mean pouring two kitchen cups of water into an empty bowl. A line is a level inside a particular pan. A measured water ratio is a different instruction. Pick the method the manufacturer gives for your grain and cooker; don’t combine half of each.
Translate the rice volume.
This helper answers one narrow question: how many milliliters of dry rice do those supplied-cup quantities represent? It assumes your manual confirms a 180 mL cup. It does not calculate water, cooked yield, portions or a safe batch size.
| Rice cups | Dry rice, mL | 240 mL cup equivalents |
|---|---|---|
| 0.5 | 90 | 0.375 |
| 1 | 180 | 0.75 |
| 1.5 | 270 | 1.125 |
| 2 | 360 | 1.5 |
| 3 | 540 | 2.25 |
| 4 | 720 | 3 |
The last column uses a specifically labeled 240 mL cup, not every cup sold in every country. For example, three rice cups occupy 540 mL: 2.25 of those 240 mL cups. These are calculated volume equivalents. They do not tell you how much cooked rice you’ll serve, and they don’t turn a small cooker into a larger one.
Read capacity with its unit attached.
Zojirushi lists the NS-TSC10, Stainless Brown (-XJ) at up to 5.5 supplied cups and the NS-TSC18, Stainless Brown (-XJ) at up to 10. Its footnote specifies raw short-grain white rice and approximately 180 mL per cup; other grains may differ. Exact manufacturer specifications
The first calculation is consistent with the maker’s 1.0-liter description: 990 mL rounds to about one liter. It is not an instruction to pour one liter of water into it. Keep the three concepts separate: dry-rice capacity, the water you add and the volume of food after cooking.
These models illustrate the unit problem; this is not a comparison verdict or a shopping recommendation.
Lost the cup? Check before buying.
First check the packaging. For the NS-TSC10/18, Zojirushi says the clear measuring cup is tucked into a hole in the foam above the cooker. Its FAQ also explains that some models have a separate green cup for rinse-free rice, so a spare scoop should match the job as well as the brand. Zojirushi FAQ, questions 3 and 28
- Identify: read the full model number on the appliance, including any suffix.
- Confirm: find the supplied-cup volume and the correct grain/menu instructions.
- Measure: if the manual specifies 180 mL, use that dry-rice volume. Keep “approximately ¾ cup” approximate.
- Replace carefully: verify a replacement cup against the manufacturer’s information, not just a similar-looking photo.
Don’t convert 180 mL to 180 grams of rice. Milliliters describe volume; grams describe mass. A scale’s water-based “mL” mode is not a direct dry-rice volume measurement. Use a rice-specific weight instruction only when your recipe or manufacturer actually supplies one.
The quick answers.
Can I always use a 180 mL cup?
No. It is the documented size for the examples here. Check your exact model and grain. Special cups and different instructions exist.
Does “two cups” mean two servings?
Not automatically. Read whether the quantity means dry rice or cooked rice and which cup it uses. Choose portions separately.
Can the calculator tell me which water line to use?
No. It only multiplies a stated rice-cup count by 180. Your cooker’s grain chart, minimum batch and maximum batch still govern.
Keep the cup, grain and water instructions together. That is the useful shortcut.
Sources
Primary references checked October 11, 2026. Manufacturer facts describe the documented models; calculations are ours.