100 milliliters (ml) is approximately 0.42 cups. This conversion is based on the standard measurement where 1 cup equals 240 milliliters. Therefore, to convert milliliters to cups, you divide the number of milliliters by 240. In this case, 100 ml divided by 240 gives you roughly 0.42 cups. This measurement is useful in cooking and baking when you need to convert between metric and imperial units.