Cups to Ounces Conversion Calculator
Enter the volume in cups below to calculate the weight in ounces.
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How to Convert Cups to Ounces
Since cups are a unit of volume and ounces are a unit of mass, which are different physical quantities, we need to know one more physical quantity of the ingredient or substance to convert between them. In this case, we need to account for the density of the substance whenever we do a conversion.
Therefore, to convert between cups and ounces of an ingredient or substance, we must either multiply or divide by its density, depending on which direction we are performing the conversion.
Cups to Ounces Formula
To convert a measurement in cups to ounces, multiply the volume by the density of the ingredient or material. Note that in order for this to work, the density must be in ounces per cup (oz/c).
If the density is given in grams per milliliter (g/mL), then first multiply the density by 8.3454 to convert to oz/c.
For a density given in g/mL, you can use this simple formula to convert:
ounces = cups × 8.3454 × density
Thus, the weight in ounces is equal to the volume in cups multiplied by 8.3454 times the density (in g/mL) of the ingredient, substance, or material.
This formula is for converting to ounces in weight, if you're trying to convert to a volume measurement in fluid ounces, try our cups to fluid ounces calculator.
When to Convert Cups to Ounces
Cups and ounces are both commonly used to measure cooking ingredients.
For cooking applications, most chefs suggest measuring dry ingredients by weight rather than volume to improve accuracy in the measurements. The density of dry ingredients can vary for a variety of reasons, such as compaction and clumping.
The best way to ensure an accurate conversion is to use a scale. When a scale is not available, a calculator like the one above is a good way to estimate the volume to weight conversion.
Another useful application of weight and volume conversions is chemistry. When performing chemical reactions by combining separate chemicals to produce a new chemical, one must know the exact amount of each chemical to add in order to maximize the yield of the reaction.
It is common to mix powdered chemicals with liquid, or aqueous, chemicals, and this is where it becomes very useful to convert between weights and volumes.
Keep reading to learn more about each unit of measure.
How Many Ounces Are in a Cup?
The actual weight of a cup will vary depending on the density of the material. The table below shows how many ounces of various wet and dry ingredients are in a cup.
|Volume in Cups:||Weight in Ounces of:|
|Water||Milk||Cooking Oil||All Purpose Flour||Granulated Sugar|
|1/8 c||1.0432 oz||1.0745 oz||0.917994 oz||0.55184 oz||0.881849 oz|
|1/4 c||2.0864 oz||2.1489 oz||1.836 oz||1.1037 oz||1.7637 oz|
|1/3 c||2.7818 oz||2.8653 oz||2.448 oz||1.4716 oz||2.3516 oz|
|1/2 c||4.1727 oz||4.2979 oz||3.672 oz||2.2074 oz||3.5274 oz|
|2/3 c||5.5636 oz||5.7305 oz||4.896 oz||2.9431 oz||4.7032 oz|
|3/4 c||6.2591 oz||6.4468 oz||5.508 oz||3.311 oz||5.2911 oz|
|1 c||8.3454 oz||8.5958 oz||7.344 oz||4.4147 oz||7.0548 oz|
What Is a Cup?
One cup is equal to 236.588 milliliters, but in nutrition labeling, one cup is defined as 240 milliliters. To further confuse things, a metric cup is equal to 250 mL, while in Japan, a cup is equivalent to only 200 mL.
The cup is a US customary unit of volume. Cups can be abbreviated as c, and are also sometimes abbreviated as C. For example, 1 cup can be written as 1 c or 1 C.
Learn more about cups.
What Is an Ounce?
The ounce is a US customary and imperial unit of mass. Ounces can be abbreviated as oz; for example, 1 ounce can be written as 1 oz.
An ounce is also frequently referred to as a unit of weight. While technically, an ounce is a measure of mass, and weight is actually a measure of force, the two are equivalent as long as we are performing our calculations on Earth.
For example, an object with a mass of 1 ounce weighs 1 ounce on Earth, but only weighs one-sixth of that on the moon, yet still has the same mass.
Learn more about ounces.
- National Institute of Standards & Technology, Culinary Measurement Tips, https://www.nist.gov/pml/owm/culinary-measurement-tips
- CK-12 Foundation, Introductory Chemistry (CK-12) - 12.6: Mass-Volume Stoichiometry, https://chem.libretexts.org/Bookshelves/Introductory_Chemistry/Introductory_Chemistry_(CK-12)/12%3A_Stoichiometry/12.06%3A_Mass-Volume_Stoichiometry
- U.S. Food & Drug Administration, Guidance for Industry: Guidelines for Determining Metric Equivalents of Household Measures, https://www.fda.gov/regulatory-information/search-fda-guidance-documents/guidance-industry-guidelines-determining-metric-equivalents-household-measures
- James Bucki, Troy Ounce vs. Ounce, The Spruce, https://www.thesprucecrafts.com/troy-ounce-vs-ounce-4588158