How Many Ounces in a Cup?

Answer

8 fl oz

There are 8 fluid ounces in 1 US cup (236.6 ml).

UK: 1 metric cup (250 ml) = 8.799 imp fl oz

Exact: 1 cup = 8 fl oz

Cups to Ounces conversion chart

Cups to ounces (US units)
Cups	Ounces
one eighth cup	1
one quarter cup	2
one third cup	2 and two thirds
three eighths cup	3
one half cup	4
five eighths cup	5
two thirds cup	5 and one third
three quarters cup	6
seven eighths cup	7
1 cup	8
1 and one quarter cups	10
1 and one third cups	10 and two thirds
1 and one half cups	12
1 and two thirds cups	13 and one third
1 and three quarters cups	14
2 cups	16
2 and one half cups	20
3 cups	24
4 cups	32
5 cups	40
6 cups	48
8 cups	64
10 cups	80
12 cups	96
16 cups	128

How Many Ounces in a Cup - Cups to Oz Converter — Cups to ounces chart from 1/8 cup to 16 cups, as a card to save or print.

How to convert cups to ounces

fluid ounces = cups × 8

Example: 2 1/2 cups × 8 = 20 fl oz.

Find out how many ounces are in a cup. Convert cups to ounces instantly, see a chart from 1/8 to 16 cups, get the exact formula and compare US and UK sizes. — On the scale, 1 cup lines up with 8 fluid ounces; read any other amount straight across.

Multiply the number of cups by 8 to get US fluid ounces. One US cup holds exactly 8 fluid ounces, which is 236.6 ml.

For 3/4 cup of milk, the math is 3/4 × 8 = 6 fluid ounces. For 1 1/3 cups of stock, it is 1 1/3 × 8 = 10 2/3 fluid ounces.

To go back from ounces to cups, divide by 8. A 12 fl oz can of soup holds 1 1/2 cups.

US vs UK cups and fluid ounces

A US cup is 236.6 ml. Recipes from the UK, Australia, Canada and New Zealand that use cups usually mean a metric cup of 250 ml, which is 8.454 fl oz.

US nutrition labels use a slightly larger cup of 240 ml. That is why a label may list a serving as 1 cup (240 ml) while your measuring cup holds a little less.

The fluid ounce is not the same size in both countries either. An imperial fluid ounce is 28.41 ml and a US fluid ounce is 29.57 ml, so a metric cup equals 8.799 imp fl oz. For everyday cooking the gap is small, but it adds up in baking.

cup and fluid ounce sizes by country
Unit	Size	Used in
US cup	236.6 ml	US
US legal cup	240 ml	US nutrition labels
metric cup	250 ml	UK, Australia, Canada, New Zealand
US fluid ounce	29.57 ml	US
imperial fluid ounce	28.41 ml	UK

Fluid ounces or ounces by weight?

A fluid ounce measures space, while an ounce on a kitchen scale measures weight. The rule of eight ounces in a cup only holds for water and liquids of about the same density, such as milk, juice or broth.

Dry ingredients break the rule. According to USDA data, a cup of all-purpose flour weighs about 4.4 ounces, and a cup of granulated sugar about 7.1 ounces. Use a scale or the cups to grams converter when a recipe gives dry ingredients by weight.

Cups and ounces: questions

Is 1 cup 8 oz or 16 oz?

One US cup is 8 fluid ounces. The number sixteen belongs to the pint: 16 fluid ounces make one US pint, which is 2 cups.

Is 1/4 cup the same as 2 fl oz?

Yes. A quarter cup holds 2 fluid ounces, the same as 4 tablespoons. Most measuring cup sets include a quarter cup, so you rarely need to count spoons.

Is 1 cup 8 oz dry?

Not by weight. A dry measuring cup still holds 8 fluid ounces of space, but the weight depends on the food. A cup of flour weighs about 125 grams, while a cup of sugar weighs about 200 grams.

Is 16 oz the same as 1 cup?

No. Sixteen fluid ounces equal 2 cups, which is one US pint. A cup is half that amount.

Is 8 oz exactly 1 cup?

For liquids in US units, yes. Eight fluid ounces are exactly one US cup, or 236.6 ml. Eight ounces of a dry ingredient by weight can fill more or less than a cup.

Related conversions

Sources: Unit definitions: NIST Handbook 44 · Last reviewed Sep 27, 2026 · Report an error