You have not mentioned that what you want to measure in a cup and in which unit you want to convert 11/2 cups. Anyways, 11/2 cups means 5 and a half cup. Now I convert it in ounces because normally measurement of cup is done in ounces. There are 8oz in one cup and in 5 and a half cup there are total 44oz. I hope you are clear about it now ! If there is still confusion please comment back I will further explain it to you.