Fluid Ounces to Cups Converter
Enter the volume in fluid ounces below to convert it to cups.
Convert Fluid Ounces (US) to Cups (US)
Enter a value in fluid ounces (us) (fl oz) to convert to cups (us) (cup).
Fluid Ounce to Cup Conversion Table
Table showing various fluid ounce measurements converted to cups. Click any preset value or arrow to load it into the converter.
How to Convert Fluid Ounces to Cups
To convert fluid ounces to cups, multiply the volume by the following conversion ratio: 0.125 cups/fluid ounce.
Since one fluid ounce is equal to 0.125 cups, you can use this simple formula to convert:
The volume in cups is equal to the volume in fluid ounces multiplied by 0.125.
For example, here's how to convert 16 fluid ounces to cups using the formula above.
How Many Cups Are in a Fluid Ounce?
There are 0.125 cups in a fluid ounce, which is why we use this value in the formula above.
Our fluid ounce to cup calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Fluid Ounces and cups are both units used to measure volume. Keep reading to learn more about each unit.
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). [1]
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.
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). [2]
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.
When converting volume between fluid ounces (fl oz) and cups (cup), keep full floating-point precision (1 fl oz = 0.125 cup; 1 cup = 8 fl oz) during intermediate calculations and round only the final cup figure to match your instrument tolerance.
More Fluid Ounce & Cup Conversions
Need to calculate in the opposite direction? Use our cups (us) to fluid ounces (us) converter (cup to fl oz) to switch your starting unit immediately. You can also explore related tools such as converting tablespoons (us) to cups (us), converting liters to cups (us), or converting fluid ounces (us) to milliliters.
Convert from Fluid Ounces
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 — Fluid Ounces (US) (fl oz) to Cups (US) (cup)
- [2]NIST HB 44 SpecificationNIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Fluid Ounce (US) (fl oz) & Cup (US Customary) (cup)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (fl oz to cup)