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Volume conversion

Cups to Fluid Ounces Converter

Convert US customary volume cups to US fluid ounces. This calculator handles liquid volume only, not ingredient weight.

Enter cups

The fluid ounces result updates as you type.

Fluid ounces

US fluid ounces
12.00 fl oz

What this calculator is for

Enter a volume in US customary cups to convert it to US fluid ounces. The calculator uses 1 US cup = 8 US fluid ounces, which is useful for liquids, drinks, soups, sauces, and measuring containers.

Fluid ounces measure volume. This calculator does not convert ingredient weight in ounces. Flour, sugar, butter, and other dry ingredients have different weights per cup, so those conversions need an ingredient-specific weight calculator or kitchen scale.

Formula

The math this page uses

Fluid ounces = Cups × 8

1 US cup = 8 US fl oz = 16 US tablespoons

How it works

Treat the input as US customary volume cups.

Multiply cups by 8 to calculate US fluid ounces.

Keep the result labeled fl oz so it is not confused with ounces by weight.

Key caveat

Before you use the number

Uses US customary cups and US fluid ounces only.

How to use this calculator

  1. 01Enter the number of US customary cups.
  2. 02Read the result in US fluid ounces.
  3. 03Confirm that your recipe or container uses volume, not weight ounces.

Inputs explained

US cups
A US customary volume measurement. One US cup equals 8 US fluid ounces.

Outputs explained

US fluid ounces
A liquid-volume result labeled fl oz. It is not an ingredient weight in oz.

Worked examples

Convert 1.5 cups of broth

  • Start with 1.5 US cups.
  • 1.5 × 8 = 12 US fluid ounces.
  • Measure 12 fl oz in a volume-marked pitcher or cup.

Convert 3/4 cup of milk

  • Enter 0.75 for 3/4 cup.
  • 0.75 × 8 = 6 US fluid ounces.
  • The recipe amount is 6 fl oz by volume.

Convert 4 cups of stock

  • Start with 4 US cups.
  • 4 × 8 = 32 US fluid ounces.
  • That volume also equals 1 US quart.

When to use it

  • Scale drinks, soups, sauces, and other liquid recipes.
  • Match cup-based recipes to pitchers or bottles marked in fluid ounces.
  • Convert batch volumes for meal prep, catering, or beverage service.

Tips

  • Useful anchors: 1/4 cup is 2 fl oz, 1/2 cup is 4 fl oz, and 1 cup is 8 fl oz.
  • Check imported recipes carefully because metric and imperial cup definitions differ.
  • Use grams or a kitchen scale when a dry ingredient needs an ounces-by-weight result.

Limitations

  • Uses US customary cups and US fluid ounces only.
  • Converts volume to volume and does not account for ingredient density or weight.
  • Does not convert metric cups, imperial cups, or imperial fluid ounces.

Methodology & assumptions

  • Uses the US customary volume relationship 1 cup = 8 US fluid ounces.
  • Multiplies the entered cup volume by 8.
  • Labels outputs as fl oz to distinguish volume from ounces by weight.

Sources

Check the underlying references

Last reviewed 2026-07-20

FAQs

How many fluid ounces are in 1 US cup?+

One US customary cup equals 8 US fluid ounces.

Is 3/4 cup equal to 6 fluid ounces?+

Yes. Multiply 0.75 cups by 8 to get 6 US fluid ounces.

Does this convert cups of flour or sugar to weight ounces?+

No. It converts cup volume to fluid-ounce volume. Ingredient weight depends on density and packing, so use an ingredient-specific conversion or scale.

Are US and metric cups the same?+

No. A US customary cup is about 236.588 mL, while a metric cup is 250 mL.

How do I convert fluid ounces back to cups?+

Divide US fluid ounces by 8. For example, 12 fl oz ÷ 8 = 1.5 cups.