Not always in cooking or baking an' there are slight differences anyway. "Cups" (with the option of grams sometimes which does me head in even more) are normally used Stateside for some baking I've noticed, which I can't get me head round. Plus in me own house we don't really do anything Metric. Every recipe book we have in this house has everything in lbs, ounces, pints an fluid ounces which I've always worked with. Throw grams, cups or milliliters into my cooking equation an' I get angry. Had to convert temperatures though, we don't really work in Fahrenheit for cooking it's always Celsius or a Gas Mark.