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Cups to Fluid Ounces Converter

Convert cups to fluid ounces using the formula cup × 8 = fl oz. The calculator below shows higher precision results. The reference table is rounded for readability.

This converter uses US customary fluid ounces. UK (imperial) fluid ounces are a different size.

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8 fl oz
cup × 8 = fl oz
cup to fl oz formula and worked examples
Try: 1 cup 5 cup 10 cup 50 cup 100 cup

Formula and Step-by-Step

cup × 8 = fl oz

Step-by-step: 1 cup to fl oz

  1. Start with 1 cup
  2. Multiply by 8: 1 × 8 = 8
  3. Result: 1 cup = 8 fl oz

Conversion Table

Common cups to fluid ounces values. The table and calculator both use the same conversion formula shown above.

Cups (cup) Fluid Ounces (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 2,000 fl oz
500 cup 4,000 fl oz
1,000 cup 8,000 fl oz

What Are Cups and Fluid Ounces?

What is a Cup?

A US cup is a unit of volume equal to approximately 236.6 milliliters. It is a standard cooking measurement in US recipes.

What is a Fluid Ounce?

A US fluid ounce is a unit of volume equal to approximately 29.57 milliliters. A UK (imperial) fluid ounce is slightly smaller at 28.41 milliliters. This converter uses US fluid ounces.

Why convert cups to fluid ounces?

People convert cups to fluid ounces when working across different measurement systems.

Frequently Asked Questions

1 cup equals 8 fluid ounces.
The formula is: cup × 8 = fl oz. See the cup to fl oz formula page for step-by-step worked examples.
Use the fluid ounces to cups converter. 1 fl oz = 0.125 cup.
Yes. The conversion uses the formula cup × 8 = fl oz, which is the exact internationally defined standard. Table values are rounded for quick reference.
Apply the formula cup × 8 = fl oz. For quick estimates, round the factor to a simpler number.
person Written by Sean Day verified Reviewed by UnitCompare update Last updated Mar 28, 2026