Cups to fluid ounces converter
Convert cups to fluid ounces instantly with a fast cup to fl oz calculator.
About converting cups to fluid ounces
Kitchen measurements often shift depending on the recipe source
Cups and fluid ounces are both common in US cooking, but recipes, drink labels, and mixing instructions do not always use the same unit. One recipe may call for 2 cups of broth, while a bottle is marked in fluid ounces. Another might list a serving size in fluid ounces even though your measuring tools are cup-based. That is where a cups to fluid ounces converter becomes genuinely useful rather than just convenient.
Conversion formula
For US volume measurements, the rule is direct: multiply cups by 8 to get fluid ounces. One cup equals 8 fluid ounces, half a cup equals 4 fluid ounces, and 2 cups equals 16 fluid ounces. The important detail is that this page refers to fluid ounces, which measure volume, not weight ounces used for solids on a scale.
Common cups to oz values
A quarter cup converts to 2 fluid ounces. Three quarters of a cup is 6 fluid ounces. Two cups equal 16 fluid ounces, which is a very common reference point for soups, smoothies, and baking ingredients. These are practical numbers that come up when scaling recipes, portioning drinks, or comparing package sizes at the store.
When this conversion is useful
Cups to fluid ounces is most useful in cooking, meal prep, beverage mixing, and nutrition tracking. It helps when recipes use cups but bottles, cartons, and nutrition labels use ounces. It is also useful when scaling servings up or down without rewriting an entire ingredient list. A dedicated converter with examples and a quick table saves time and helps avoid the classic mistake of confusing fluid ounces with weight ounces.
Formula
live referenceUse the same conversion rule shown below in the widget, examples, and table on this page.
fluid ounce = cup x 8
2 cup x 8 = 16 fl oz
Example conversions
30 presetsQuick reference values for the most common cups to fluid ounces lookups.
0.125 cup
1 fl oz
0.25 cup
2 fl oz
0.3333 cup
2.6664 fl oz
0.5 cup
4 fl oz
0.6667 cup
5.3336 fl oz
0.75 cup
6 fl oz
1 cup
8 fl oz
1.25 cup
10 fl oz
1.5 cup
12 fl oz
2 cup
16 fl oz
2.5 cup
20 fl oz
3 cup
24 fl oz
4 cup
32 fl oz
5 cup
40 fl oz
6 cup
48 fl oz
8 cup
64 fl oz
10 cup
80 fl oz
12 cup
96 fl oz
16 cup
128 fl oz
20 cup
160 fl oz
24 cup
192 fl oz
32 cup
256 fl oz
40 cup
320 fl oz
48 cup
384 fl oz
64 cup
512 fl oz
80 cup
640 fl oz
100 cup
800 fl oz
128 cup
1,024 fl oz
160 cup
1,280 fl oz
256 cup
2,048 fl oz
Conversion table
30 rows| cup | fl oz |
|---|---|
| 0.125 cup | 1 fl oz |
| 0.25 cup | 2 fl oz |
| 0.3333 cup | 2.6664 fl oz |
| 0.5 cup | 4 fl oz |
| 0.6667 cup | 5.3336 fl oz |
| 0.75 cup | 6 fl oz |
| 1 cup | 8 fl oz |
| 1.25 cup | 10 fl oz |
| 1.5 cup | 12 fl oz |
| 2 cup | 16 fl oz |
| 2.5 cup | 20 fl oz |
| 3 cup | 24 fl oz |
| 4 cup | 32 fl oz |
| 5 cup | 40 fl oz |
| 6 cup | 48 fl oz |
| 8 cup | 64 fl oz |
| 10 cup | 80 fl oz |
| 12 cup | 96 fl oz |
| 16 cup | 128 fl oz |
| 20 cup | 160 fl oz |
| 24 cup | 192 fl oz |
| 32 cup | 256 fl oz |
| 40 cup | 320 fl oz |
| 48 cup | 384 fl oz |
| 64 cup | 512 fl oz |
| 80 cup | 640 fl oz |
| 100 cup | 800 fl oz |
| 128 cup | 1,024 fl oz |
| 160 cup | 1,280 fl oz |
| 256 cup | 2,048 fl oz |
About this converter
tool notesVolume conversions are most useful when liquids, recipes, and packaging labels refuse to stick to one unit system. A recipe might use cups, a bottle may show fluid ounces, and product packaging often switches to milliliters or liters. This hub brings those everyday conversions together so you can move quickly from a kitchen measurement to a packaging check or a beverage portion comparison. The goal is not just to provide a calculator, but to make common liquid-size conversions easier to scan, understand, and reuse across cooking, shopping, and product research.
How many ounces are in 1 cup?
1 US cup equals 8 fluid ounces.
What is the formula to convert cups to fl oz?
Multiply cups by 8 to convert them to fluid ounces.
Are cups to ounces and cups to grams the same?
No. Cups to ounces measures volume here, while grams would depend on the ingredient weight.