A US customary cup equals 236.5882365 milliliters, widely used in American recipes.
Cup to Fluid ounce
Convert Cup to Fluid ounce instantly. Free online cooking unit converter with exact formula, conversion table and FAQ.
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A US fluid ounce is 1/128 of a US gallon, equal to about 29.57 milliliters.
fl oz = cup × 8
Results update instantly for Cup to Fluid ounce conversions.
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Formula
fl oz = cup × 8
cup = fl oz × 0.125
Conversion table
| 1 cup | 8 fl oz |
| 5 cup | 40 fl oz |
| 10 cup | 80 fl oz |
| 20 cup | 160 fl oz |
| 50 cup | 400 fl oz |
| 100 cup | 800 fl oz |
| 500 cup | 4000 fl oz |
| 1000 cup | 8000 fl oz |
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Frequently asked questions
What is the source unit in this conversion?
The source unit is the cup (cup). A US customary cup equals 236.5882365 milliliters, widely used in American recipes.
What is the destination unit in this conversion?
The destination unit is the fluid ounce (fl oz). A US fluid ounce is 1/128 of a US gallon, equal to about 29.57 milliliters.
How do I convert cup to fluid ounce?
Multiply the cup value by 8. For example, 10 cup × 8 = 80 fl oz.
Is the cup to fluid ounce conversion exact?
Yes. This conversion uses a fixed factor defined for cooking measurement standards, so results are consistent every time.
Where is this conversion commonly used?
It's used when following recipes, adjusting ingredient quantities, or converting between US customary and metric cooking measurements.
Can I convert fluid ounce back to cup?
Yes. Multiply the fluid ounce value by 0.125 to get cup.
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About this conversion
This page converts cup (cup) to fluid ounce (fl oz) within the cooking converter.
A US customary cup equals 236.5882365 milliliters, widely used in American recipes. A US fluid ounce is 1/128 of a US gallon, equal to about 29.57 milliliters.
The formula is fl oz = cup × 8, based on each unit's fixed relationship to the cooking converter's reference units.
Results are consistent because the conversion relies on a fixed numerical ratio rather than an estimate.
Use the calculator above for instant results, or the table below for common cup values already converted to fluid ounce.