The amount of water left in a dishwasher after a cycle can vary depending on the model and its specific design. In general, modern dishwashers are designed to drain most of the water after each wash cycle. On average, you can expect around 1 to 2 cups (240 to 480 milliliters) of water to remain in the dishwasher after the cycle is complete.
The reason for leaving some water behind is to prevent any residual water from entering the dishwasher's components and causing damage, and also to help maintain a seal to prevent leaks. Additionally, some dishwashers have a small amount of water at the bottom to help keep the seals and gaskets moist, which can prolong their lifespan.
If you notice a significantly larger amount of water remaining in the dishwasher, or if it appears to be abnormally high, it could indicate a problem with the dishwasher's drainage system. In such cases, it's best to refer to the manufacturer's instructions or contact a professional technician to inspect and repair the dishwasher if necessary.