Oz to Cups Converter
Convert ounces to cups in seconds. Choose fluid ounces for liquids or dry ounces for ingredients like flour and sugar, pick your cup standard (US, Imperial, or Metric), and select an ingredient if you are working with a weight measurement. Results update instantly as you type, and the steps panel shows the full calculation.
Formula
Worked example
To convert 16 fl oz to US cups: 16 / 8 = 2 cups. To convert 4.4 oz of all-purpose flour: 4.4 / 4.409 = 0.998 cups, which is essentially 1 cup.
Fluid ounces vs dry ounces - why it matters
A fluid ounce (fl oz) measures volume: exactly 1/8 of a US customary cup, or about 29.57 mL. A dry ounce measures mass or weight - the same number of ounces can occupy very different volumes depending on the ingredient. One ounce of water and one ounce of all-purpose flour both weigh the same on a scale, but flour takes up nearly twice the space because it is much less dense. Whenever a recipe lists "1 oz" for a liquid ingredient such as water, juice, or milk, it almost certainly means fluid ounces and the conversion is straightforward: divide by 8. For dry ingredients like flour, sugar, or oats, use the dry-ounces mode and select the ingredient to get the correct density adjustment.
Cup standards around the world
The US customary cup (236.588 mL, exactly 8 US fl oz) is the most common standard for American recipes and the default here. The US legal cup (240 mL) is used in nutrition labeling in the United States and differs by less than 2 percent. The metric cup (250 mL) is the standard in Australia, Canada, and South Africa and is slightly larger than the US cup - so 1 metric cup of water equals about 8.45 fl oz instead of 8. The Imperial cup (approximately 284 mL) is an older British measure equal to 10 Imperial fl oz; it appears in vintage UK and some Caribbean recipes. When a recipe specifies cups without further context, assume US customary if the recipe is American or Canadian, and metric if it is Australian. The difference is small for most everyday cooking but can matter in baking where precision affects texture.
Ingredient densities for dry conversions
The number of cups a given weight of ingredient occupies depends on how densely it packs. All-purpose flour weighs about 4.41 oz per US cup when lightly spooned and leveled, versus about 4.76 oz for whole-wheat flour and only 3.88 oz for cake flour. Granulated sugar is much denser at around 7.05 oz per cup, and brown sugar packs even more tightly at 7.58 oz per cup when measured packed. Powdered (icing) sugar, which is finely ground, is lighter at roughly 4.23 oz per cup. This converter uses standard reference densities, but in practice your result can vary if you sift, pack, or scoop the ingredient differently. The most accurate method for baking is to weigh on a kitchen scale and treat cup measurements as approximate.
Common cooking conversions at a glance
In the US system, 2 tablespoons = 1 fl oz, 8 fl oz = 1 cup, 2 cups = 1 pint, 4 cups = 1 quart, and 16 cups = 1 gallon. Knowing these relationships lets you scale recipes quickly without a calculator. A standard can of coconut milk is 13.5 fl oz (just under 1 and 3/4 cups); a standard can of tomatoes is 14.5 oz (for purees, about 1.8 US cups). A US pint of water is 16 fl oz or 2 cups. A US quart jar holds exactly 4 cups or 32 fl oz. These landmarks cover most everyday cooking and meal-prep scenarios.
Fluid ounces to US cups - quick reference
| Fluid ounces (fl oz) | US cups | Fraction | mL (approx) |
|---|---|---|---|
| 1 | 0.125 | 1/8 cup | 30 |
| 2 | 0.25 | 1/4 cup | 59 |
| 3 | 0.375 | 3/8 cup | 89 |
| 4 | 0.5 | 1/2 cup | 118 |
| 5 | 0.625 | 5/8 cup | 148 |
| 6 | 0.75 | 3/4 cup | 177 |
| 8 | 1 | 1 cup | 237 |
| 12 | 1.5 | 1-1/2 cups | 355 |
| 16 | 2 | 2 cups (1 pint) | 473 |
| 24 | 3 | 3 cups | 710 |
| 32 | 4 | 4 cups (1 quart) | 946 |
| 64 | 8 | 8 cups (1/2 gallon) | 1893 |
| 128 | 16 | 16 cups (1 gallon) | 3785 |
Based on 1 US customary cup = 8 fluid ounces. Commonly used cooking and baking fractions.
Frequently asked questions
How many ounces are in a cup?
One US customary cup contains exactly 8 US fluid ounces. So to convert fluid ounces to cups, divide by 8; to go the other way, multiply cups by 8. For other cup standards: 1 US legal cup = 8.115 fl oz, 1 metric cup = 8.454 fl oz, and 1 Imperial cup = 10 Imperial fl oz (about 9.6 US fl oz).
What is the difference between dry ounces and fluid ounces?
Fluid ounces (fl oz) are a unit of volume, always equal to 1/8 of a US cup for liquids. Dry ounces are a unit of weight or mass. Converting dry ounces to cups requires knowing the ingredient's density because the same weight occupies different volumes. A cup of water weighs about 8.35 oz, while a cup of all-purpose flour weighs only about 4.4 oz.
How many cups is 8 oz?
If you mean 8 fluid ounces, that equals exactly 1 US cup. If you mean 8 dry ounces (by weight), the number of cups depends on the ingredient: 8 oz of water is about 0.96 cups, 8 oz of all-purpose flour is about 1.81 cups, and 8 oz of granulated sugar is about 1.13 cups.
How many cups is 16 oz?
16 fluid ounces equals exactly 2 US cups, or 1 US pint. If you are measuring 16 oz of an ingredient by weight, use the dry-ounces mode and select the ingredient above for an accurate cup equivalent.
How many cups is 32 oz?
32 fluid ounces equals exactly 4 US cups, or 1 US quart. This is also equal to about 946 mL.
Can I use this for Australian or UK recipes?
Yes. Switch the cup standard to "Metric cup (250 mL)" for Australian and New Zealand recipes, or "Imperial cup (284 mL)" for older British and some Caribbean recipes. Metric cups are about 6 percent larger than US cups, so the conversion ratio changes slightly.
Why does flour give a different number of cups than water for the same ounce weight?
Because flour and water have very different densities. One cup of water weighs about 8.35 oz, but one cup of sifted all-purpose flour weighs only about 4.4 oz. So the same weight results in a much larger volume when you are measuring flour. This is why professional bakers weigh ingredients rather than measuring by volume.