Fluid Ounce (US)

Definition: The US fluid ounce (symbol: fl oz) is a unit of volume used for measuring liquids. One US fluid ounce equals exactly 29.5735 milliliters. There are 8 fluid ounces in 1 cup, 2 tablespoons in 1 fluid ounce, and 128 fluid ounces in 1 gallon. The simple 8:1 relationship between fluid ounces and cups makes this one of the most common conversions in cooking. Important: Fluid ounces measure volume, not weight.

History/origin: The fluid ounce was originally based on the volume occupied by one ounce of water. The US fluid ounce was standardized in 1959 as exactly 29.5735 milliliters. The 8:1 relationship with cups (8 fluid ounces = 1 cup) has remained constant and is fundamental to American cooking measurements.

Current use: The US fluid ounce is commonly used in the United States for measuring beverages, cooking ingredients, medicine dosages, and nutrition labels. It's the standard unit on US food packaging and recipes. Converting fluid ounces to cups is one of the most frequent conversions in everyday cooking.

Cup (US)

Definition: The US cup is a unit of volume used in cooking and baking. One US cup equals exactly 8 fluid ounces or 236.588 milliliters. There are 2 cups in 1 pint, 4 cups in 1 quart, and 16 cups in 1 gallon.

History/origin: The cup has been used in cooking for centuries, but the US cup was standardized as exactly 8 fluid ounces in the late 19th century. The simple 8:1 relationship with fluid ounces makes conversions straightforward for recipe measurements.

Current use: The US cup is the primary measuring unit for cooking and baking in the United States. It's used in recipes for both liquid and dry ingredients. Most American measuring cup sets are based on this standard. The cup is essential for home cooking and professional food preparation in the US.

Fluid Ounces to Cups Conversion Table

How to Convert Fluid Ounces to Cups