Cups to Oz

Convert Cups to Fluid Ounces

"Cups to Oz" Calculator

Convert

Cups to Fluid Ounces

How to Convert Cups to Fluid Ounces

Cups to Fluid Ounces Conversion Formula

To convert US cups to fluid ounces, use this simple formula:

fluid ounces = cups × 8

One US customary cup is defined as exactly 8 US fluid ounces. Note this is the fluid ounce of volume, not the ounce of weight (28.35 g) — for dry ingredients the weight of a cup depends on the ingredient, so this converter is for liquid volume only.

Step-by-Step Volume Conversion Guide

  1. Take your volume in US cups
  2. Multiply it by 8 (the number of fluid ounces in one US cup)
  3. Get your result in US fluid ounces

Common Cups to Fluid Ounces Conversions

CupsFluid Ounces (fl oz)
0.25 cups2 fl oz
0.333 cups2.66 fl oz
0.5 cups4 fl oz
0.667 cups5.34 fl oz
0.75 cups6 fl oz
1 cup8 fl oz
1.25 cups10 fl oz
1.333 cups10.66 fl oz
1.5 cups12 fl oz
1.667 cups13.34 fl oz
1.75 cups14 fl oz
2 cups16 fl oz
2.5 cups20 fl oz
3 cups24 fl oz
3.5 cups28 fl oz
4 cups32 fl oz
4.5 cups36 fl oz
5 cups40 fl oz
5.5 cups44 fl oz
6 cups48 fl oz
8 cups64 fl oz
10 cups80 fl oz
12 cups96 fl oz
16 cups128 fl oz
24 cups192 fl oz
32 cups256 fl oz
64 cups512 fl oz

Practical Applications of Cups to Oz Converter

  • Cooking: Turning a recipe amount in cups into fluid ounces for a measuring jug
  • Beverages: 1 cup of coffee is 8 fl oz; 2 cups is a 16 fl oz serving
  • Baking: Scaling liquid ingredients when a jug is marked only in fluid ounces
  • Meal prep: Working out how many fluid ounces a batch of stock or milk contains
  • Nutrition: Comparing a cup serving with a drink label given in fluid ounces
  • Bartending: Converting a cup of mixer into fluid ounces for a recipe

History and Origin of the Cup and Fluid Ounce

The cup as a cooking measure was standardized in the US so that 1 cup equals 8 US fluid ounces. The fluid ounce is a customary unit of volume, defined in the US as exactly 29.5735 ml (1/128 of a US gallon). Beware the ambiguity: the US customary cup is 8 fl oz (about 236.6 ml), the US "legal" cup used on nutrition labels is 240 ml, and the metric cup used in Australia and parts of Europe is 250 ml. This converter uses the US customary cup of 8 fluid ounces.

Quick Conversion Tips

The math is easy because 1 cup = 8 fl oz. To convert cups to fluid ounces in your head, multiply by 8: 2 cups × 8 = 16 fl oz, and ½ cup × 8 = 4 fl oz. Remember the milestones: 1 cup = 8 fl oz, 2 cups = 16 fl oz, and 4 cups = 32 fl oz.

See Also

About "Cups to Oz" Calculator

This converter will help you to convert Cups to US Fluid Ounces (cups to fl oz). One US cup holds 8 US fluid ounces, so this is a volume conversion — not the weight ounce. For example, it can help you find out how many fluid ounces is 2 cups? (The answer is: 16). Enter the number of cups (e.g. '2') and hit the 'Convert' button.

FAQ

How many fluid ounces are in one US cup?

One US customary cup holds exactly 8 US fluid ounces (1 cup = 8 fl oz), so to convert cups to fluid ounces you multiply by 8.

What is the formula to convert cups to fluid ounces?

To convert US cups to fluid ounces, multiply the cup value by 8. For example, 2 cups × 8 = 16 fl oz.

Are these fluid ounces or weight ounces?

These are US fluid ounces, a unit of volume. They are not weight ounces (28.35 g) used for dry ingredients — for dry weights, a cup does not equal a fixed number of weight ounces because it depends on the ingredient.

Does a metric cup also equal 8 fluid ounces?

No. Only the US customary cup equals 8 US fl oz (about 236.6 ml). The US "legal" cup is 240 ml and the metric cup used in Australia is 250 ml. This tool uses the US customary cup.