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Cups to Fluid Ounces Converter

Convert cups to fluid ounces and fluid ounces to cups instantly. Bidirectional volume converter with formula and common values.

cup

Fluid Ounces

20

fl oz

2.5 cup = 20 fl oz

fl oz = cup × 8

Cups to Fluid Ounces: 1 cup equals 8 fl oz. To convert cups to fluid ounces, multiply by 8 (fl oz = cup × 8). For example, 10 cup = 80 fl oz.

How to Convert Cups to Fluid Ounces

To convert from cups to fluid ounces, multiply the value by 8. The conversion is linear, meaning doubling the input doubles the output.

Conversion Formula

  • Cups to Fluid Ounces: fl oz = cup × 8
  • Fluid Ounces to Cups: cup = fl oz ÷ 8

Cups to Fluid Ounces Conversion Chart

Cups (cup)Fluid Ounces (fl oz)
0.10.8
0.252
0.54
18
216
324
540
1080
20160
25200
50400
100800
2502000
10008000

Understanding the Units

What is a Cup?

The US legal cup equals exactly 240 milliliters; the US customary cup used in recipes is 236.5882365 milliliters.

Common contexts: cooking (US).

What is a Fluid Ounce?

The US fluid ounce equals exactly 29.5735295625 milliliters; the imperial fluid ounce is 28.4130625 milliliters.

Common contexts: beverages, cooking (US).

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FAQ

How many fluid ounces are in a cup?

One US cup equals exactly 8 US fluid ounces.

How do I convert cups to fluid ounces?

Multiply the number of cups by 8. For example, 3.5 cups × 8 = 28 fl oz.

Is a cup the same in all countries?

No. A US cup is 8 fl oz (236.588 mL), while an imperial cup is 10 imperial fl oz (284.131 mL). This converter uses US measurements.

How many fluid ounces are in half a cup?

Half a cup equals 4 fluid ounces.

How many fluid ounces are in 1 cup?

1 cup equals 8 fl oz.

How do you convert cups to fluid ounces?

Multiply the cup value by 8. Formula: fl oz = cup × 8.

How many fluid ounces are in 5 cups?

5 cup = 40 fl oz.

How do you convert fluid ounces back to cups?

Use the inverse formula: cup = fl oz ÷ 8. For example, 1 fl oz = 0.125 cup.

What is the difference between Cup and Fluid Ounc?

The US legal cup equals exactly 240 milliliters; the US customary cup used in recipes is 236.5882365 milliliters. The US fluid ounce equals exactly 29.5735295625 milliliters; the imperial fluid ounce is 28.4130625 milliliters.