1.81US cups
Ounces to Cups
Fluid ounces are simple. Weight ounces depend on what you are measuring.
Tip: you can type “8 oz flour” or “500 ml to oz”.
8 oz of all-purpose flour =
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Reading this as weight ounces (oz) — what scales and food labels use.
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Details
All units
- lb
- 0.5
- g
- 227
- kg
- 0.227
- oz t
- 7.29
How we got this
8 ounces (weight) × 28.349523125 g/oz = 226.796185 g
1 oz = 28.349523125 g. 1 lb = 453.59237 g. 1 troy oz = 31.1034768 g (international avoirdupois and troy definitions, NIST).
Density used: all-purpose flour, 0.53 g/mL, range 0.5 to 0.6. Spooned and leveled is about 125 g per US cup. Scooped straight from the bag can reach 150 g. Source: King Arthur Baking ingredient weight chart.
Range with this density: 1.6 to 1.92 US cups.
Also useful:
If the recipe says 8 fl oz, that is volume, and it is exactly one US cup (236.59 mL). If it says 8 oz of flour, that is weight, and the answer depends on how dense the flour is. A cup of all-purpose flour weighs about 4.4 oz. A cup of butter weighs 8 oz.
That is why a single ounces-to-cups factor does not exist. Pick the ingredient in the converter, or use the table below. Flour is the slippery one: spooned and leveled gives about 125 g per cup, scooped from the bag can reach 150 g, so even a good chart carries a 20% error bar.
Quick answers
- 8 US fl oz
- 1 US cup
- 8 oz of flour
- 1.81 US cups
- 8 oz of sugar
- 1.13 US cups
- 8 oz of butter
- 1 US cup
- 8 oz of water
- 0.96 US cups
Formula
US cups = US fl oz ÷ 8US fl oz = US cups × 8
Ounces and cups by ingredient
Densities are typical values. Real flour and sugar vary with brand, humidity and how you scoop.
| Ingredient | g per US cup | oz per US cup | US cups in 8 oz |
|---|---|---|---|
| water By definition close to 1 g/mL at room temperature. | 236.6 | 8.35 | 0.96 |
| milk Whole milk is about 244 g per US cup. | 243.7 | 8.6 | 0.93 |
| all-purpose flour Spooned and leveled is about 125 g per US cup. Scooped straight from the bag can reach 150 g. | 125.4 | 4.42 | 1.81 |
| granulated sugar About 200 g per US cup. | 201.1 | 7.09 | 1.13 |
| brown sugar, packed About 220 g per US cup, firmly packed. | 220 | 7.76 | 1.03 |
| powdered sugar About 120 g per US cup, unsifted. | 120.7 | 4.26 | 1.88 |
| butter 227 g per US cup, 113 g per stick. | 226.9 | 8 | 1 |
| honey About 340 g per US cup. | 336 | 11.85 | 0.68 |
| vegetable oil About 218 g per US cup. | 217.7 | 7.68 | 1.04 |
| table salt About 288 g per US cup. Coarse kosher salt is much lighter. | 288.6 | 10.18 | 0.79 |
| cocoa powder About 85 g per US cup, unsweetened. | 85.17 | 3 | 2.66 |
| rolled oats About 90 g per US cup. | 89.9 | 3.17 | 2.52 |
| rice, uncooked About 185 g per US cup, long grain white. | 184.5 | 6.51 | 1.23 |
Sources: King Arthur Baking ingredient weight chart, USDA FoodData Central.
Conversion table
| Amount | US fl oz to US cups | oz of flour to US cups | oz of sugar to US cups | oz of butter to US cups | oz of water to US cups |
|---|---|---|---|---|---|
| 1 | 0.13 | 0.23 | 0.14 | 0.12 | 0.12 |
| 2 | 0.25 | 0.45 | 0.28 | 0.25 | 0.24 |
| 3 | 0.38 | 0.68 | 0.42 | 0.37 | 0.36 |
| 4 | 0.5 | 0.9 | 0.56 | 0.5 | 0.48 |
| 5 | 0.63 | 1.13 | 0.7 | 0.62 | 0.6 |
| 6 | 0.75 | 1.36 | 0.85 | 0.75 | 0.72 |
| 7 | 0.88 | 1.58 | 0.99 | 0.87 | 0.84 |
| 8 | 1 | 1.81 | 1.13 | 1 | 0.96 |
| 9 | 1.12 | 2.03 | 1.27 | 1.12 | 1.08 |
| 10 | 1.25 | 2.26 | 1.41 | 1.25 | 1.2 |
| 12 | 1.5 | 2.71 | 1.69 | 1.5 | 1.44 |
| 16 | 2 | 3.62 | 2.26 | 2 | 1.92 |
| 16.9 | 2.11 | 3.82 | 2.38 | 2.11 | 2.03 |
| 20 | 2.5 | 4.52 | 2.82 | 2.5 | 2.4 |
| 24 | 3 | 5.43 | 3.38 | 3 | 2.88 |
| 32 | 4 | 7.23 | 4.51 | 4 | 3.83 |
| 50 | 6.25 | 11.3 | 7.05 | 6.25 | 5.99 |
| 64 | 8 | 14.47 | 9.02 | 8 | 7.67 |
| 100 | 12.5 | 22.61 | 14.1 | 12.49 | 11.98 |
Which ounce?
| Ounce | Exactly | Used for |
|---|---|---|
| Ounce (oz) | 28.349523125 g | Food, mail, kitchen scales, the default meaning of a bare “oz”. |
| US fluid ounce (US fl oz) | 29.5735295625 mL | US labels, bottles, cans. 16 of them make a US pint. |
| UK fluid ounce (UK fl oz) | 28.4130625 mL | UK recipes, older imperial labels. 20 of them make a UK pint. |
| Troy ounce (oz t) | 31.1034768 g | Gold, silver, platinum. About 10% heavier than the ounce on your kitchen scale. |
Common amounts
- 8 oz cup 237 mL
- 12 oz can 355 mL
- 16.9 oz bottle 500 mL
- 20 oz bottle 591 mL
- 3.4 oz TSA 100 mL
- 1.7 oz perfume 50 mL
- 8 oz steak 227 g
- 1 oz gold 31.1 g
Questions
How many cups is 8 oz?
8 US fl oz is 1 cup. 8 oz by weight is 1 cup of butter, about 1.8 cups of flour, about 1.1 cups of granulated sugar, and about two-thirds of a cup of honey.
How many ounces is a cup of flour?
About 4.4 oz (125 g) if spooned and leveled, and up to 5.3 oz (150 g) if scooped straight from the bag.
Is a cup of water 8 oz?
Both ways, yes. 1 US cup of water is 8 US fl oz, and it weighs 236.6 g, which is 8.35 oz. That is the idea behind "a pint's a pound": 16 US fl oz of water weighs about 1.04 lb.
Do UK cups work the same way?
A UK or metric cup is 250 mL, about 6% bigger than a US cup, so every cup figure grows with it. A 250 mL cup of flour is about 132 g.
How many oz is a cup?
A US cup is 8 US fl oz as a volume. As a weight it depends on the ingredient: about 4.4 oz of flour, 7 oz of sugar, 8 oz of butter.
Why do some sites say 1 oz = 0.125 cup?
That applies the fluid rule, 8 fl oz per cup, to everything. It is right for water, milk and juice, and wrong for flour, sugar and butter.