Convert US Cup to US Fluid Ounce
Convert us cups to us fluid ounces instantly. 1 us cup = 8 us fluid ounce — use the live calculator, the exact formula, a conversion table and worked examples. Also check the US Fluid Ounce to US Cup converter for the reverse conversion.
Units explained
US Cup
A US customary cup is one sixteenth of a US gallon (236.588 mL).
Standardized for American cooking; distinct from the 240 mL US legal cup and the 250 mL metric cup.
The standard US cooking-volume unit in recipes.
US customary cooking measure.
US Fluid Ounce
A US fluid ounce is 1/128 of a US gallon (29.5735 mL).
Derived from the gallon subdivision; distinct from the slightly smaller UK fluid ounce.
Standard for US beverage and nutrition labeling.
English customary; US since 1824.
US Cup to US Fluid Ounce conversion formula
The relationship between us cups and us fluid ounces:
To convert us cups to us fluid ounces, multiply the value in us cups by 8. To reverse, multiply us fluid ounces by 0.125.
How to use this converter
Type a value into the calculator. The result in us fluid ounces updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the US Fluid Ounce to US Cup converter for the reverse direction.
Step-by-step: convert us cups to us fluid ounces
- Write down the value in us cups (cup).
- Multiply that value by the factor 8.
- The product is the equivalent value in us fluid ounces (fl oz).
- To reverse, multiply the us fluid ounce value by 0.125.
Worked examples
Example 1 — Convert 1 cup to fl oz:
1 × 8 = 8 fl oz
Example 2 — Convert 100 cup to fl oz:
100 × 8 = 800 fl oz
Real-world example — Plastic-film thickness alternates
A 150-us cup plastic film converts cleanly to us fluid ounces — useful for packaging buyers reconciling supplier datasheets across metric and US measurement systems.
150 cup × 8 = 1200 fl oz
Real-world example — Hair-width scale measurements
A 70-us cup measurement (about the diameter of a human hair) is the kind of value materials engineers regularly express in adjacent micro-scale units like us fluid ounces for direct comparison across supplier datasheets.
70 cup × 8 = 560 fl oz
Real-world example — Paper and film thicknesses
At the thickness of office paper (roughly 3 us cups), converting between sub-millimeter units is routine for packaging and printing buyers comparing quotes from metric and US suppliers.
3 cup × 8 = 24 fl oz
US Cup to US Fluid Ounce conversion table
Standard reference values for converting us cups to us fluid ounces:
| US Cup [cup] | US Fluid Ounce [fl oz] |
|---|---|
| 0.01 | 0.08 |
| 0.1 | 0.8 |
| 1 | 8 |
| 2 | 16 |
| 3 | 24 |
| 4 | 32 |
| 5 | 40 |
| 10 | 80 |
| 20 | 160 |
| 30 | 240 |
| 40 | 320 |
| 50 | 400 |
| 100 | 800 |
| 500 | 4000 |
| 1000 | 8000 |
Frequently asked questions
How many us fluid ounces is 1 us cup?
How do I convert us cups to us fluid ounces?
How do I convert us fluid ounces back to us cups?
How many us fluid ounces is 100 us cups?
Popular volume unit conversions
Convert US Cup to other volume units
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Metric / SI (8 units)
US Customary (Liquid) (7 units)
Imperial (UK) (4 units)
Cubic (length-derived) (3 units)
Cooking / Culinary (3 units)
Sources & references
Conversion factor (1 cup = 8 fl oz) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.