📏 US fluid ounces to US cups Converter
Convert us fluid ounces (fl oz) to us cups (cup) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 us fluid ounce (fl oz) = 0.125 us cups (cup). Formula: cup = fl oz × 0.125.
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US fluid ounces to US cups Converter inputs
Result
US fluid ounces to US cups conversion table
| US fluid ounces (fl oz) | US cups (cup) |
|---|---|
| 0.1 fl oz | 0.0125 cup |
| 0.5 fl oz | 0.0625 cup |
| 1 fl oz | 0.125 cup |
| 2 fl oz | 0.25 cup |
| 3 fl oz | 0.375 cup |
| 5 fl oz | 0.625 cup |
| 10 fl oz | 1.25 cup |
| 20 fl oz | 2.5 cup |
| 25 fl oz | 3.125 cup |
| 50 fl oz | 6.25 cup |
| 100 fl oz | 12.5 cup |
| 1,000 fl oz | 125 cup |
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How to convert us fluid ounces to us cups
Multiply the number of us fluid ounces by 0.125 to get us cups: cup = fl oz × 0.125.
Example: 5 fl oz = 0.625 cup.
The us fluid ounce (fl oz) and the us cup (cup) are both units of volume. Need the opposite direction? Use the cup to fl oz 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 cups are in a us fluid ounce?
1 us fluid ounce = 0.125 us cups.
How do I convert us fluid ounces to us cups?
Use the formula cup = fl oz × 0.125. For example, 5 fl oz = 0.625 cup.
How do I convert us cups back to us fluid ounces?
1 us cup = 8 us fluid ounces. Use the cup to fl oz 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.