Quick Conversion
1 US cup = 8 fluid ounces
Cups = Fluid Ounces ÷ 8. This ratio is fixed and does not depend on the ingredient, because both units measure volume.
Ounces to Cups
Eight US fluid ounces make one US cup, a fixed liquid-volume ratio separate from weight ounces.
Ounces to Cups Chart
Ounces to Cups
| fl oz | Cups |
|---|---|
| 1 fl oz | ⅛ cup |
| 2 fl oz | ¼ cup |
| 4 fl oz | ½ cup |
| 6 fl oz | ¾ cup |
| 8 fl oz | 1 cup |
| 12 fl oz | 1 ½ cups |
| 16 fl oz | 2 cups |
| 32 fl oz | 4 cups |
How the Conversion Works
Fluid ounces measure volume, so this ratio applies to any liquid you pour: water, milk, oil, or juice. Weight ounces are a different unit that measures mass, so 'ounces' in a scale-based recipe should be converted with an ingredient-specific density instead of this volume ratio.
If a recipe lists a dry ingredient in ounces (for example, '4 oz flour'), that is almost always a weight ounce, not a fluid ounce. Use the grams-to-cups converter with the ingredient's density rather than dividing by 8.
Frequently Asked Questions
How many ounces are in a cup?
There are 8 US fluid ounces in one US cup for liquids.
Are fluid ounces the same as weight ounces?
No. A fluid ounce measures volume and a weight (avoirdupois) ounce measures mass. They only match for liquids close to water's density.
How do I convert dry ounces to cups?
Use the ingredient's grams-per-cup value in the grams to cups converter, since dry ounces describe weight, not volume.