It depends on what you are measuring in the cup. A cup is a
measure of volume, but a dry ounce is a measure of weight.

Depending on the density of the material you are going to have
in the cup, the weight in ounces of the material will vary. For
example, if you fill the cup with lead, the cup will weigh much
more than if you fill with feathers.

This question would be similar to asking how much does a 6 foot
person weight. It depends on the person of course. A cup of water
will weigh more than a cup of flour.

For cooking, you can find tables that convert cups to ounces and
vice versa for a variety of food. To the left is a link with a
table for standard cooking ingredients. Make sure you look
carefully and scroll down to find the correct conversion table
specific ingredient you are using! The conversion is different for
each ingredient!

**Here are A FEW COMMON FOODS and their conversion from cups to
ounces** (notice how much the weight varies!)**:**

Granulated sugar: 1 cup = 7.055 ounces

Brown sugar: 1 cup, packed = 7.760 ounces

White flour: 1 cup = 4.409 ounces

White rice, uncooked: 1 cup = 6.526 ounces

White rice, cooked: 1 cup = 6.173 ounces

Butter: 1 cup = 8.007 ounces

Almonds, slivered: 1 cup = 3.810 ounces

Oil: 1 cup = 7.901 ounces

Maple syrup: 1 cup = 11.358 ounces

Milk, non-fat: 1 cup = 8.642 ounces

Milk, sweetened condensed: 10.794 ounces

Broccoli, florets: 1 cup = 2.504 ounces

Raisins: 1 cup, packed = 5.820 ounces

Milk, dry: 1 cup = 2.399 ounces

Yogurt: 1 cup = 8.642 ounces

Water: 1 cup = 8.325 ounces

Confectioners sugar: 1 C = 3.880 ounces

Cocoa: 1 C = 4.409 ounces

**Please refer to the related link to find out more on the
automatic calculator. It will allow you to enter the food and the
amount and then it will convert it into units for you.