Cups to Fluid Ounces Converter
1 US cup = 8 fluid ounces, so ½ cup is 4 fl oz and 2 cups is 16 fl oz. That is volume: by weight, a cup of flour is only 4.4 oz.
1 cup is
8 fl oz
Also 16 tbsp · 237 ml
Cups to fluid ounces chart
How to convert cups to fluid ounces
Multiply the cups by 8, the fluid ounces in one cup: fluid ounces = cups × 8. For example, 3 cups × 8 = 24 fl oz.
Fluid ounces vs ounces by weight
A fluid ounce (fl oz) measures volume: an eighth of a US cup, 29.6 ml. An ounce (oz) measures weight: a sixteenth of a pound, 28.35 g. A measuring cup always holds 8 fl oz; what it weighs depends on what is in it. For milliliters, see ounces to ml.
Water is the one case where the two nearly agree: a cup of water weighs 8.3 oz (236 g). Flour is light, so a cup weighs only 4.4 oz; honey is dense, so a cup weighs 12 oz.
So when a recipe lists flour, sugar or chocolate in ounces, it means weight: use a scale, or convert with ounces to grams and the chart below. Liquids in a US recipe are usually given in fluid ounces, and a measuring cup will do.
How many ounces in a cup, by ingredient
What one US cup (8 fl oz) weighs. Dry ingredients spooned in and levelled; brown sugar packed.
| 1 cup of | Ounces (weight) | Grams |
|---|---|---|
| Water | 8.3 oz | 236 g |
| Milk | 8.6 oz | 245 g |
| Heavy Cream | 8.4 oz | 238 g |
| Vegetable Oil | 7.7 oz | 218 g |
| Honey | 12 oz | 340 g |
| All-Purpose Flour | 4.4 oz | 125 g |
| Bread Flour | 4.5 oz | 127 g |
| Cake Flour | 4 oz | 114 g |
| Granulated Sugar | 7.1 oz | 200 g |
| Brown Sugar (Packed) | 7.8 oz | 220 g |
| Powdered Sugar | 4.2 oz | 120 g |
| Butter | 8 oz | 227 g |
| Cocoa Powder | 3 oz | 86 g |
| Oats | 3.2 oz | 90 g |
| Rice (Uncooked) | 6.5 oz | 185 g |
| Chocolate Chips | 6 oz | 170 g |
US cup measurements
The key relationships for scaling a recipe up or down.
- 1 cup8 fl oz
- 1 cup16 tbsp
- 1 cup48 tsp
- 1 pint2 cups
- 1 quart4 cups
- 1 gallon16 cups
Questions
How many ounces in 1 cup?
There are 8 fluid ounces in 1 US cup. This is a standard measurement that makes conversions straightforward.
How many ounces in 2 cups?
There are 16 fluid ounces in 2 cups. Since 1 cup = 8 fl oz, simply multiply cups by 8.
How do I convert cups to fluid ounces?
Multiply the number of cups by 8 to get fluid ounces. For example, 3 cups × 8 = 24 fluid ounces.
How many ounces in half a cup?
Half a cup (½ cup) equals 4 fluid ounces. Quarter cup (¼ cup) equals 2 fluid ounces.
Are fluid ounces and weight ounces the same?
No. Fluid ounces measure volume, while ounces measure weight. They nearly agree only for water-like liquids: a cup of water is 8 fl oz and weighs 8.3 oz. A cup of flour is also 8 fl oz but weighs about 4.4 oz.
How many ounces in a cup of flour?
A US cup of all-purpose flour, spooned in and levelled, weighs about 4.4 oz (125 g), although it fills 8 fluid ounces. A cup of granulated sugar weighs 7.1 oz (200 g) and a cup of butter 8 oz (227 g, two sticks).