> a Zojirushi cup isn't the same as an imperial cup
Indeed, a zojirushi cup is 180ml, while an imperial cup is 284ml. Perhaps you meant a US Customary cup, at either 237ml or 240ml? Then there's a whole mess of other measurements people call a "cup" (118ml, 227ml, 250ml...)
> The gō or cup is a traditional Japanese unit based on the ge which is equal to 10 shaku or 1⁄10 shō. Back in the year 1891 it was officially equated with 2401/13310 liters. The gō is the traditional amount used for a serving of rice and a cup of sake in Japanese cuisine. Although the gō is no longer used as an official unit, 1-gō measuring cups or their 180ml metric equivalents are often included with modern premium rice cookers.
* https://greedy-panda.com/2020/06/the-rice-measuring-cup-expl...
> Measuring rice correctly is the key to make delicious rice. For rice measurement, we use a traditional Japanese measure called go or rice cup. A level cup of this measuring cup is 1 rice cup. 1 rice cup equals approximately ¾ US cup or 180 ml.