US Cups to fl oz Converter

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Convert US cups to US fluid ounces using the customary 8-fl-oz cup (236.59 ml): 1 cup = 8 fl oz, 2 cups = 16 fl oz, 4 cups = 32 fl oz. Note that the US legal cup used in nutrition labelling is 240 ml (≈ 8.115 fl oz), about 1.4 % larger than the customary cup used here. Browser-local conversion, no upload.

Cup (US)
Fluid ounce (US)

Cup (US) → Fluid ounce (US)

Quick reference table

Cup (US)Fluid ounce (US)
1 cup (US)8 fl oz (US)
2 cup (US)16 fl oz (US)
5 cup (US)40 fl oz (US)
10 cup (US)80 fl oz (US)
25 cup (US)200 fl oz (US)
50 cup (US)399.9999 fl oz (US)
100 cup (US)799.9999 fl oz (US)

Glossary

US cup

A US customary cup is exactly 8 US fluid ounces or about 236.59 ml — the value used in most US recipes and on cooking measuring cups. The US legal cup used in nutrition labelling is slightly larger at exactly 240 ml (a 1.4 % difference). This converter uses the customary 8-fl-oz cup. One cup contains 16 tablespoons or 48 teaspoons.

US fluid ounce (fl oz)

A US fluid ounce is exactly 1/128 of a US gallon, or about 29.5735 ml. It is the dominant volume unit on US food, drink and personal-care packaging. Eight US fluid ounces make one US cup; 16 make a US pint; 32 make a quart; 128 make a US gallon. Do not confuse with the UK fluid ounce (≈28.41 ml).

Metric / SI volume

In the metric system, volume is reported in liters (everyday) or cubic meters (industrial), with millilters for fine resolution. The relations are exact powers of ten: 1 m³ = 1,000 L = 1,000,000 ml, and 1 ml = 1 cm³. The metric system is the standard worldwide for science, beverages, fuel in metric countries, and most modern recipes outside the United States.

Imperial / US Customary volume

US customary and UK imperial systems both use gallon, quart, pint and fluid ounce — but with different sizes. The US gallon is 3.785 L (128 US fl oz); the UK imperial gallon is 4.546 L (160 UK fl oz). Cooking units (tsp = 4.93 ml, tbsp = 14.79 ml, cup = 240 ml) follow the US standard in nearly all modern English-language recipes.

Related tools

US Fluid Ounces to Cups
Convert US fl oz to US cups — 8 fl oz = 1 cup (236.59 ml customary)
US Cups to Milliliters
Convert US cups to ml — 1 US cup = 240 ml
US Cups to US Pints
Convert US cups to US pints — 2 cups ≈ 1 pint
Volume Converter
Convert volumes — ml, L, m³, cups, tbsp, fl oz, US/UK gallons and pints