The Gourmet Rice Duo, and all of the Breville rice cookers, come with their own measuring cup. It’s important to use this cup and not a standard measuring cup when making any rice in the cooker. The measuring cup actually holds 5 &1/2 ounces of rice/water while the standard American 1 cup measuring cup will hold 7 ounces. If using any cup other then the one that came with the rice cooker, it’s important to make a measurement conversion to ensure that either too much water, too much rice, or possibly both, does not occur.