How Many Ounces in a Cup?
There are 8 US fluid ounces in 1 US cup (236.6 ml). A UK cup holds 10 imperial fl oz (284.1 ml). A metric cup holds 250 ml, about 8.45 US fl oz. By weight it depends on the ingredient: 1 cup of flour is about 4.23 oz, 1 cup of sugar about 6.98 oz.
Ounces in a cup at a glance (US, legal, metric, UK)
The cup in your recipe decides the answer. Read across for the same cup in US and imperial fluid ounces.
| Cup | ml | US fl oz | Imperial fl oz |
|---|---|---|---|
| US cup | 236.6 | 8 | 8.33 |
| US legal cup (nutrition labels) | 240 | 8.12 | 8.45 |
| Metric cup | 250 | 8.45 | 8.80 |
| UK cup | 284.1 | 9.61 | 10 |
Fluid ounces vs weight ounces
Fluid ounces (fl oz) are a unit of volume. One US fl oz is 29.57 ml, so 8 of them fill a US cup whatever the liquid. Weight ounces (oz) are a unit of mass, 28.35 g each.
When a recipe gives ounces of flour, sugar or butter, it means weight, and how much of a cup that fills depends on the ingredient. For those, use the ounces to cups converter.
Cup fractions in ounces
Each US cup fraction in fluid ounces, with the spoon or pint equivalent where it helps. More spoon conversions are on the tablespoons to cups page.
| Cup | US fl oz | Equivalent |
|---|---|---|
| ⅛ cup | 1 | 2 tbsp |
| ¼ cup | 2 | |
| ⅓ cup | 2.67 | 5 tbsp + 1 tsp |
| ½ cup | 4 | |
| ⅔ cup | 5.33 | |
| ¾ cup | 6 | |
| 1 cup | 8 | |
| 2 cups | 16 | 1 pint |
| 4 cups | 32 | 1 quart |
Going bigger? 2 cups make a pint, 4 a quart and 16 a gallon: see the gallon conversion chart.
Weight ounces in a cup of common ingredients
By weight, a cup holds a different number of ounces for each ingredient. These figures use the grams per US cup in our baking conversion chart; to convert any amount by ingredient, use the converter.
| Ingredient | oz per cup |
|---|---|
| All-purpose flour | 4.23 |
| Granulated sugar | 6.98 |
| Brown sugar (packed) | 7.51 |
| Powdered sugar | 3.99 |
| Butter | 8 |
| Honey | 11.96 |
| Whole milk | 8.61 |
| Water | 8.35 |
| Rolled oats | 3.14 |
| Cocoa | 2.96 |
| Chocolate chips | 6 |
UK and Australian recipes
A British recipe that gives fluid ounces means imperial ones. An imperial fl oz is 28.41 ml, about 4% smaller than a US fl oz, and a UK pint is 20 imperial fl oz (568.3 ml), where a US pint is 16 US fl oz.
Australian, New Zealand and Canadian recipes use the metric cup of 250 ml, about 8.45 US fl oz. See cups to ml for the US, metric and UK cups side by side.
Quick converter: cups and fluid ounces
For liquids only. Type cups to get US fluid ounces, or swap to go the other way.
Related tools
Frequently asked questions
Does 4 oz equal 1 cup?
No. 4 fluid ounces is ½ US cup; 1 cup is 8 fl oz.
How many cups are in 10 ounces?
10 fluid ounces is 1¼ US cups. For 10 oz by weight, it depends on the ingredient.
How much does a cup measure?
A US cup is 236.6 ml (8 US fl oz). Nutrition labels use 240 ml. Metric cups are 250 ml.
Is peanut butter a wet or dry ingredient?
Measure it like a dry ingredient, by weight if you can: 1 US cup of peanut butter is about 258 g (9.1 oz) on our chart.
How many ounces are in a cup of water?
8 fluid ounces by volume, and it weighs about 8.35 oz.
How many ounces in a UK cup?
10 imperial fl oz (284.1 ml), about 9.6 US fl oz.