Cups to Fluid Ounces Converter
Enter the volume in cups below to convert it to fluid ounces.
Convert Cups (US) to Fluid Ounces (US)
Enter a value in cups (us) (cup) to convert to fluid ounces (us) (fl oz).
Cup to Fluid Ounce Conversion Table
Table showing various cup measurements converted to fluid ounces. Click any preset value or arrow to load it into the converter.
How to Convert Cups to Fluid Ounces
To convert cups to fluid ounces, multiply the volume by the following conversion ratio: 8 fluid ounces/cup.
Since one cup is equal to 8 fluid ounces, you can use this simple formula to convert:
The volume in fluid ounces is equal to the volume in cups multiplied by 8.
For example, here's how to convert 2 cups to fluid ounces using the formula above.
How Many Fluid Ounces Are in a Cup?
There are 8 fluid ounces in a cup, which is why we use this value in the formula above.
Our cup to fluid ounce calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Cups and fluid ounces are both units used to measure volume. Keep reading to learn more about each unit.
What Is a Cup?
A cup is a unit of volume equal to 0.2365882 liters (L), the base unit for volume. Equal to 8 US fluid ounces or 16 US tablespoons (236.59 mL). [1]
The cup is classified as a US customary unit of volume. Cups can be abbreviated as cup; for example, 1 cup can be written as 1 cup.
When working with cups (cup) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, cups (cup) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Fluid Ounce?
A fluid ounce is a unit of volume equal to 0.0295735 liters (L), the base unit for volume. 1/128 of a US gallon (29.5735 mL). [2]
The fluid ounce is classified as a US customary unit of volume. Fluid Ounces can be abbreviated as fl oz; for example, 1 fluid ounce can be written as 1 fl oz.
When working with fluid ounces (fl oz) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, fluid ounces (fl oz) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.
When converting volume between cups (cup) and fluid ounces (fl oz), keep full floating-point precision (1 cup = 8 fl oz; 1 fl oz = 0.125 cup) during intermediate calculations and round only the final fluid ounce figure to match your instrument tolerance.
More Cup & Fluid Ounce Conversions
Need to calculate in the opposite direction? Use our fluid ounces (us) to cups (us) converter (fl oz to cup) to switch your starting unit immediately. You can also explore related tools such as converting milliliters to fluid ounces (us), converting gallons (us) to fluid ounces (us), or converting cups (us) to tablespoons (us).
Convert from Cups
Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Cups (US) (cup) to Fluid Ounces (US) (fl oz)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Cup (US Customary) (cup) & Fluid Ounce (US) (fl oz)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (cup to fl oz)