This Ounces to Cups Calculator converts US fluid ounces into US customary cups using eight fluid ounces per cup. Enter a liquid volume in fluid ounces to calculate cups instantly. The tool supports recipe scaling and kitchen measurements while distinguishing volume ounces from weight ounces, which require ingredient density information.
Common volume equivalents:
Converted value = Source value × Conversion factor
For affine conversions such as temperature, an offset is also applied.The tool applies the relevant factor or temperature offset to the source value. Currency outputs require a current exchange-rate source, while cooking volume-to-weight conversions can vary by ingredient density and measuring method.
Use the Ounces to Cups Calculator to convert US fluid ounces (fl oz) to US customary cups. One US cup contains exactly 8 US fluid ounces. Divide the fluid-ounce value by 8 to calculate cups. This relationship converts liquid volume, not weight ounces. Weight ounces require an ingredient-specific density for conversion to cups.
To convert US fluid ounces to US cups, divide the number of fluid ounces by 8.
Conversion relationship: 8 US fl oz = 1 US cup
For example, 4 fluid ounces equal 0.5 cup, while 16 fluid ounces equal 2 cups.
The formula for converting US fluid ounces to US customary cups is:
Cups = Fluid ounces ÷ 8
You can also multiply the fluid-ounce value by 0.125:
Cups = Fluid ounces × 0.125
Because one US cup is defined as 8 US fluid ounces, the factor is exact when both measurements use the US customary volume system. Displayed decimal results may be rounded for convenience.
Convert 20 US fluid ounces to cups:
Starting value: 20 fl oz
Calculation: 20 ÷ 8 = 2.5
Final value: 20 US fl oz = 2.5 US cups
| US Fluid Ounces | US Cups |
|---|---|
| 1 fl oz | 0.125 cup |
| 2 fl oz | 0.25 cup |
| 3 fl oz | 0.375 cup |
| 4 fl oz | 0.5 cup |
| 5 fl oz | 0.625 cup |
| 6 fl oz | 0.75 cup |
| 7 fl oz | 0.875 cup |
| 8 fl oz | 1 cup |
| 10 fl oz | 1.25 cups |
| 12 fl oz | 1.5 cups |
| 14 fl oz | 1.75 cups |
| 16 fl oz | 2 cups |
| 20 fl oz | 2.5 cups |
| 24 fl oz | 3 cups |
| 28 fl oz | 3.5 cups |
| 32 fl oz | 4 cups |
| 40 fl oz | 5 cups |
| 48 fl oz | 6 cups |
| 64 fl oz | 8 cups |
| 128 fl oz | 16 cups |
For recipe measurements, 2.667 fluid ounces are approximately 1/3 cup, and 5.333 fluid ounces are approximately 2/3 cup. These values repeat as decimals, so they are normally displayed as fractions or rounded decimals.
A US fluid ounce is a unit of volume in the US customary measurement system. Its symbol is fl oz. It is commonly used for beverages, liquid ingredients, medicines, and packaged liquids. One US fluid ounce equals approximately 29.5735 milliliters.
A fluid ounce must not be confused with a weight ounce. The symbol oz generally represents mass, while fl oz represents volume. Converting weight ounces to cups requires the density of the ingredient.
A US customary cup is a unit of volume used primarily in American recipes and kitchen measurements. Its common symbol is cup. One US customary cup equals exactly 8 US fluid ounces and approximately 236.588 milliliters.
A US customary cup differs from a metric cup, which equals 250 milliliters, and an imperial cup, which equals approximately 284.131 milliliters. Check the measurement system when using international recipes.
There are 8 fluid ounces in 1 US cup. This applies to liquid measurements like water, milk, or oil. For dry ingredients, the ounce-to-cup ratio changes based on the ingredient's density.
Yes, 4 fluid ounces equals exactly half a US cup. This conversion is consistent for all liquids since fluid ounces measure volume directly.
It depends on the ingredient. For example, 1 cup of all-purpose flour is about 4.25 ounces, while 1 cup of granulated sugar is about 7 ounces, because dry ounces measure weight, not volume.
Divide the flour's weight in ounces by 4.25, since 1 cup of all-purpose flour weighs approximately 4.25 ounces. For precise baking, a kitchen scale is more reliable than volume estimates.
No. A US cup is 8 fluid ounces (236.6 ml), while a UK cup is slightly larger at about 10 fluid ounces (284 ml). Always check which standard a recipe uses.
Two cups equal 16 fluid ounces. This is a standard conversion used often in recipes calling for liquids like broth, milk, or water.
Enter a known source value, confirm the direction of conversion and compare the result with the level of precision required. Keep extra decimal places for technical work and round only at the final step.
In the US customary measurement system, 8 fluid ounces equal 1 cup. To convert fluid ounces to cups, divide the fluid-ounce value by 8.
Cups = Fluid ounces ÷ 8
US recipes commonly use fluid ounces and cups to measure liquids such as water, milk, broth, juice, and oil. A liquid measuring cup marked with fluid ounces and cups can help verify the converted amount.
For example, convert 20 fluid ounces to cups:
20 fl oz ÷ 8 = 2.5 cups
| US Fluid Ounces | US Cups | Common Cup Fraction |
|---|---|---|
| 1 fl oz | 0.125 cup | 1/8 cup |
| 2 fl oz | 0.25 cup | 1/4 cup |
| 2.667 fl oz | Approximately 0.333 cup | 1/3 cup |
| 4 fl oz | 0.5 cup | 1/2 cup |
| 5.333 fl oz | Approximately 0.667 cup | 2/3 cup |
| 6 fl oz | 0.75 cup | 3/4 cup |
| 8 fl oz | 1 cup | 1 cup |
A fluid ounce measures volume, while an ounce without the word “fluid” generally measures mass or weight. The conversion of 8 fluid ounces to 1 cup applies to volume measurements in the US customary system.
Weight ounces cannot be universally converted to cups because different ingredients have different densities. Eight weight ounces of flour, sugar, butter, and water do not necessarily occupy the same volume.
To convert weight ounces of a dry ingredient to cups, use an ingredient-specific conversion based on its density or a trusted recipe measurement.
This calculator uses US fluid ounces and US customary cups. Measurement standards differ in other systems:
Check which cup and fluid-ounce standards a recipe uses, especially when converting recipes published outside the United States.
To reverse the conversion, multiply the number of US cups by 8.
Fluid ounces = Cups × 8
For example, 3.5 cups contain 28 US fluid ounces:
3.5 × 8 = 28 fl oz