The capacity of an electric rice cooker can vary depending on the brand and model. However, as a general guideline, a rice cooker with a capacity of 1.8 to 2.2 liters should be sufficient for cooking rice for four people for everyday use.
On average, a serving of cooked rice is about ½ to ¾ cup (125 to 175 ml) per person. For four people, this would typically amount to 2 to 3 cups (500 to 750 ml) of uncooked rice. Keep in mind that rice expands during cooking, roughly doubling in volume, so you'll need a rice cooker that can accommodate the additional space.
A rice cooker with a 1.8 to 2.2-liter capacity should provide ample room for cooking this amount of rice. It's always a good idea to check the specific capacity guidelines provided by the manufacturer to ensure the cooker meets your needs.
Additionally, if you prefer to cook extra rice for leftovers or if your household has a larger appetite, you might consider opting for a slightly larger rice cooker with a capacity of 2.5 liters or more.