A rice cooker “cup” is not the same as a standard kitchen measuring cup. This guide on The Rice Cooker Specification Lie: Cups Are Not Cups explains why many people get mushy, dry, or inconsistent rice when they use the wrong measurement. A typical rice cooker cup is about 180 ml, while a standard US cup is about 237 ml. The inner-pot water lines are designed for the smaller rice cup. For better results, use the supplied rice cooker cup, follow the pot markings, rinse your rice, and adjust water for the rice type.