How many ounces in a cup?

The confusion comes from two different meanings of "ounce." A fluid ounce measures volume — how much space a liquid takes up. A weight ounce measures mass. For any liquid (water, milk, juice, oil), 1 cup equals exactly 8 fluid ounces, every time.

Dry ingredients are different. A cup of flour doesn't weigh the same as a cup of sugar because they pack differently. This is why serious bakers use a kitchen scale — "1 cup of flour" can vary by as much as 20% depending on how you scoop it.

The US cup is 8 fl oz (237 ml). The UK/metric cup is 250 ml — close but not identical. Most recipes mean the US standard unless stated otherwise.

In common recipes, practical conversions include butter, honey, and milk. 1 cup of butter is equivalent to 8 ounces, while 1 cup of honey weighs about 12 ounces (honey is denser than water). When measuring milk, 1 cup is approximately 8 ounces. These conversions are crucial for precise baking.

To eliminate confusion between volume and weight, a digital kitchen scale is a game changer. These scales provide measurements in grams and ounces, allowing for accurate ingredient portions regardless of density. For example, you can weigh out 4.5 ounces of flour directly rather than relying on cup measurements that vary based on how ingredients are packed.