How do I get 0.425 of a Cup what does it equal in cups water?

To get 0.425 of a cup, you would need to measure out approximately 42.5% of a standard cup measurement. This would be roughly 42.5 milliliters, which is equivalent to about 0.18 cups of water. To be precise, you could use a kitchen scale to measure out the exact amount in grams and then convert it to cups using the appropriate conversion factor.