cups to fluid-ounces | Exact Decimal + Formula
1 US Cup = 8 US Fluid Ounce
Cups to fluid ounces is the everyday US cooking conversion — one US cup is exactly 8 fluid ounces.
About US Cup and US Fluid Ounce
US Cup (cup)
A US cooking cup is 236.588 milliliters, the standard volume measure in American recipes.
Where it's used: US recipes for flour, sugar, liquids, and other ingredients.
US Fluid Ounce (fl oz)
A US fluid ounce is 1/8 of a US cup, about 29.57 milliliters.
Where it's used: Liquid ingredients and beverage recipes in the United States.
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Cooking (Volume) Converter
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Formula
fl oz = cup × 8
To convert US Cup to US Fluid Ounce, use the formula displayed above.
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US Cup to US Fluid Ounce: Quick Reference Table
| US Cup | US Fluid Ounce (Decimal) | Fraction |
|---|---|---|
| 0.001 cup | 0.008 fl oz | - |
| 0.01 cup | 0.08 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 | - |
| 5 cup | 40 fl oz | - |
| 10 cup | 80 fl oz | - |
| 25 cup | 200 fl oz | - |
| 50 cup | 400 fl oz | - |
| 100 cup | 800 fl oz | - |
| 250 cup | 2000 fl oz | - |
| 500 cup | 4000 fl oz | - |
| 1000 cup | 8000 fl oz | - |
cup to fl oz Formula and Examples
Direct Formula
fl oz = cup × 8 Inverse Formula
cup = fl oz × 0.125 Mental Math Shortcut
Multiply the value by roughly 8 to calculate the equivalent amount in your head.
Common US Cup to US Fluid Ounce Calculations
- 5 cup = 40 fl oz
- 10 cup = 80 fl oz
- 50 cup = 400 fl oz
- 100 cup = 800 fl oz
- 500 cup = 4000 fl oz
Precision & Practical Use
For example, 10 cup = 80 fl oz — roughly multiple unit increments.
Results are computed to up to 9 decimal places. Round to the precision of your measuring instrument — for most cooking (volume) applications, 2–3 significant figures are plenty.
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How to Convert US Cup to US Fluid Ounce
How many us fluid ounces are in one us cup?
One US Cup (cup) equals 8 US Fluid Ounce (fl oz). To convert us cups to us fluid ounces, multiply the us cup value by 8.
How do I convert US Cup to US Fluid Ounce?
Multiply your us cup value by 8 to get the result in US Fluid Ounce: fl oz = cup × 8. For example, 5 cup = 40 fl oz.
What is the formula for converting cup to fl oz?
The conversion formula is fl oz = cup × 8. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.
Is there a quick mental estimate for cup to fl oz?
Multiply the value by roughly 8 to calculate the equivalent amount in your head.
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