Cups to Fluid Ounces Converter

This table covers common recipe measurements.

To convert cups to fluid ounces, multiply the cup value by 8. For example, 2.5 cups times 8 equals 20 fl oz.

To go the other way, use the Fluid Ounces to Cups converter instead, which divides by 8 for you. For example, 20 fl oz divided by 8 equals 2.5 cups. For the smaller scales instead, see the Cups to Tablespoons converter or the Cups to Teaspoons converter below.

How Many Ounces in Half a Cup

Half a US cup is 4 US fluid ounces, since a full cup holds 8, and a quarter cup is 2. By weight, half a cup of an ingredient depends on what it is, as the section below explains.

"Cups to oz" is genuinely ambiguous in everyday recipe language. A fluid ounce is a fixed volume, 1/128 of a US gallon, so 1 cup of any liquid is always 8 fl oz. A dry ounce is a unit of weight, so how many ounces a cup of a dry ingredient weighs depends on that ingredient's density: a cup of flour weighs about 4.4 oz, while a cup of granulated sugar weighs closer to 7 oz, even though both fill the same 8 fl oz cup.

Which One Does This Calculator Use?

This calculator uses the fixed fluid ounce ratio, 8 fl oz per cup, the correct conversion for liquids and for any recipe instruction phrased as a volume measurement. If a recipe gives a dry ingredient by weight instead (for example, "4 oz of flour"), that figure will not match this calculator's cups-to-fl-oz output, since it is answering a different question. To convert that same cup value into milliliters instead, see the Cups to Milliliters converter below.

When a recipe lists dry ingredients in grams, the Cups to Grams Converter converts a cup of flour, sugar, butter, rice, or cocoa into its weight. A fluid ounce measures volume and a pound measures weight, so the Fluid Ounces to Pounds Converter uses the ingredient's density to connect the two. For butter specifically, the Butter Converter moves between sticks, cups, tablespoons, and grams in one step.

Every volume converter that shares a unit with this page, cups or fluid ounces, starting with the reverse conversion, one page per pair of units, then the converters that show many units at once.

The Reverse Conversion

• Oz to Cups Converter: 1 cup = 8 fluid ounces

Milliliters and Liters

• Cups to Liters Converter: 1 liter is about 4.226753 cups
• Cups to Milliliters Converter: 1 cup = 236.5882365 milliliters
• Milliliters to Fluid Ounces Converter: 1 fluid ounce = 29.5735295625 milliliters
• Liters to Fluid Ounces Converter: 1 liter is about 33.814023 fluid ounces

Spoons, Fluid Ounces and Cups

• Cups to Pints Converter: 1 pint = 2 cups
• Cups to Quarts Converter: 1 quart = 4 cups
• Cups to Tablespoons Converter: 1 cup = 16 tablespoons
• Cups to Teaspoons Converter: 1 cup = 48 teaspoons
• Cups to Gallons Converter: 1 gallon = 16 cups
• Fluid Ounces to Tablespoons Converter: 1 fluid ounce = 2 tablespoons
• Fluid Ounces to Teaspoons Converter: 1 fluid ounce = 6 teaspoons
• Fluid Ounces to Quarts Converter: 1 quart = 32 fluid ounces
• Fluid Ounces to Pints Converter: 1 pint = 16 fluid ounces
• Cups to Deciliters Converter: 1 cup = 2.365882365 deciliters
• Centiliters to Fluid Ounces Converter: 1 fluid ounce = 2.95735295625 centiliters

Multi-Unit Converters

• Gallon Converter: gallons to quarts, pints, cups, fluid ounces, liters and cubic feet at once
• Volume Converter: any volume in every unit at once, from milliliters to cubic yards, including UK imperial units