📏 US cups to US fluid ounces Converter
Convert us cups (cup) to us fluid ounces (fl oz) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 us cup (cup) = 8 us fluid ounces (fl oz). Formula: fl oz = cup × 8.
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US cups to US fluid ounces Converter inputs
Result
US cups to US fluid ounces conversion table
| US cups (cup) | US fluid ounces (fl oz) |
|---|---|
| 0.1 cup | 0.8 fl oz |
| 0.5 cup | 4 fl oz |
| 1 cup | 8 fl oz |
| 2 cup | 16 fl oz |
| 3 cup | 24 fl oz |
| 5 cup | 40 fl oz |
| 10 cup | 80 fl oz |
| 20 cup | 160 fl oz |
| 25 cup | 200 fl oz |
| 50 cup | 400 fl oz |
| 100 cup | 800 fl oz |
| 1,000 cup | 8,000 fl oz |
Other volume conversions
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How to convert us cups to us fluid ounces
Multiply the number of us cups by 8 to get us fluid ounces: fl oz = cup × 8.
Example: 5 cup = 40 fl oz.
The us cup (cup) and the us fluid ounce (fl oz) are both units of volume. Need the opposite direction? Use the fl oz to cup converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many us fluid ounces are in a us cup?
1 us cup = 8 us fluid ounces.
How do I convert us cups to us fluid ounces?
Use the formula fl oz = cup × 8. For example, 5 cup = 40 fl oz.
How do I convert us fluid ounces back to us cups?
1 us fluid ounce = 0.125 us cups. Use the fl oz to cup converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.