US Cups to US Fluid Ounces Converter
One US Cup equals 8 US Fluid Ounces (1 cup = 8 fl-oz). Multiply a US Cup value by 8 to get the equivalent in US Fluid Ounces. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
fl-oz = cup × 8
Multiply the US Cup value by 8 to get the equivalent value in US Fluid Ounces.
Example Conversions
1 US Cup (cup)
8 US Fluid Ounce (fl-oz)
5 US Cup (cup)
40 US Fluid Ounce (fl-oz)
10 US Cup (cup)
80 US Fluid Ounce (fl-oz)
25 US Cup (cup)
200 US Fluid Ounce (fl-oz)
100 US Cup (cup)
800 US Fluid Ounce (fl-oz)
Conversion Table
| US Cup (cup) | US Fluid Ounce (fl-oz) |
|---|---|
| 0.1 | 0.8 |
| 0.5 | 4 |
| 1 | 8 |
| 2 | 16 |
| 5 | 40 |
| 10 | 80 |
| 25 | 200 |
| 50 | 400 |
| 100 | 800 |
| 250 | 2000 |
| 500 | 4000 |
| 1000 | 8000 |
How to Convert Manually
Use these steps to convert US Cup values to US Fluid Ounce without the calculator.
- Write down the value in US Cup (cup) that you want to convert.
- Multiply that value by 8.
- For example, 10 US Cups × 8 = 80 US Fluid Ounces.
- Label the result as US Fluid Ounce (fl-oz).
Relative Size Comparison
This chart shows the visual difference in size between exactly one US Cup and one US Fluid Ounce.
About US Cup and US Fluid Ounce
The US cup is 8 US fluid ounces, about 236.6 milliliters. It is the backbone of American recipe measurement for both liquids and dry ingredients. The US fluid ounce is about 29.574 milliliters, one eighth of a US cup. Beverage cans, cosmetics, and baby formula in the US are labeled in fluid ounces. One US Cup equals 8 US Fluid Ounces (1 cup = 8 fl-oz). US Cup is used in American recipe measurements and in coffee maker capacities. US Fluid Ounce is used in US beverage can and bottle sizes.
Precision and Rounding:US and imperial volume units share names but differ in size (an imperial gallon is about 20% larger than a US gallon), so confirm which system a figure uses before converting. Kitchen work tolerates rounding to the nearest milliliter or quarter-teaspoon; fuel, chemistry, and brewing need three or more decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15US Cups equals120US Fluid Ounces.
15 cup × 8 = 120 fl-oz
FAQ
How do I convert US Cup to US Fluid Ounce?
Multiply the US Cup value by 8 to get the equivalent value in US Fluid Ounces.
What is the formula for US Cup to US Fluid Ounce?
The formula is fl-oz = cup × 8.
How many US Fluid Ounces are in 1 US Cup?
1 US Cup equals 8 US Fluid Ounces.
Can I convert US Fluid Ounce back to US Cup?
Yes. 1 US Fluid Ounce equals 0.125 US Cups, and the related converter can reverse the calculation.
What are common names for US Cup and US Fluid Ounce?
US Cup is shown as cup and may also be searched as cups, us cups. US Fluid Ounce is shown as fl-oz and may also be searched as fluid ounces, fl oz, us fl oz.
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