Convert one cup (US) to fluid ounces (US)

Explanation

To convert one cup (US) to fluid ounces (US) all we need is to know the conversion factor and we are done. Luckily, we can compute that factor using the units' definitions below.

The result is that there are 8 fluid ounces (US) in 1 cup (US).

Formula

1 cup = 8 fl oz

cups (US)cup

dimension	volume
system	U.S. customary units (USCS)
symbol	cup

The cup (cup) is a unit of volume in the U.S. customary units.

Definition of the cup

One cup is 8 US fluid ounces.

NIST Handbook 44 Specifications: Appendix C

Value in terms of the SI

One cup is equivalent to 236.5882365 cubic centimeters.

Equivalences

One cup is also equivalent to:

Some Facts

The cup is extensively used in cooking recipe in the US, even for ingredients that are supposed to be solid like butter. I'm not sure whether it is genius or preposterous.

Other culinary units

teaspoon	tsp
tablespoon	Tbsp	3 teaspoons
fluid ounce	fl oz	2 tablespoons
shot	jig	3 tablespoons
cup	cup	16 tablespoons

US Culinary Units

The US culinary units are mainly used in recipes but also can be found on nutrition labels and even in pharmaceutic medical prescriptions (especially the teaspoon).

When on nutrition labels, the units have their value in milliliters rounded. In that case a teaspoon means 5 milliliters (mL), a tablespoon means 15 mL, a cup means 240 mL.^[source]

fluid ounces (US)fl oz

dimension	volume
system	U.S. customary units (USCS)
symbol	fl oz, floz

The fluid ounce (fl oz, floz) is a unit of volume in the U.S. customary units.

Definition of the fluid ounce

There are 128 US fluid ounces in one US gallon.

NIST Handbook 44 Specifications: Appendix C p. C-5

Value in terms of the SI

One fluid ounce is equivalent to 29.5735295625 cubic centimeters.

Equivalences

One US fluid ounce is also equivalent to:

Some Facts

The fluid ounce is used in the US for liquid goods sold in smaller quantities than a gallon like beverages of course, but also perfume, shampoo, etc. In metric countries, the fluid ounce is replaced by the milliliter.

US fluid volume units

minim	min
fluid dram	fl dr	60 minims
fluid ounce	fl oz	8 fluid drams
gill	gi	4 fluid ounces
pint	pt	4 gills
quart	qt	2 pints
gallon	gal	4 quarts
barrel	bbl	31.5 gallons
barrel (petroleum)	bbl	42 gallons

The United States Customary System

The United States customary system is a system of measurements used in the United States since 1832. It is based on English units in use before the definition of the Imperial system in 1824.

With the Metric Conversion Act of 1975 the U.S. began a metrication program but customary units are still widely used.