Cups To Oz
Convert cups to US fluid ounces (fl oz) instantly. 1 US cup equals 8 fl oz. Perfect for cooking, baking, recipe scaling, and daily kitchen measurements.
About This Calculator
The Cups to Oz Converter is a free online tool that instantly converts volume measurements from US cups to US fluid ounces (fl oz). Whether you are following an American recipe, scaling ingredients for meal prep, or working on a baking project, this converter gives you accurate results in seconds. Since 1 US cup equals exactly 8 US fluid ounces, the conversion is straightforward — just multiply your cup measurement by 8.
This converter is ideal for home cooks, bakers, nutritionists, and anyone who regularly works with recipes from the United States. The calculation uses the standard US customary volume system where: oz = cups × 8. For example, 2 cups of milk equal 16 fl oz, 0.5 cups of oil equal 4 fl oz, and 3 cups of water equal 24 fl oz. You can enter any positive number of cups, including fractional values like 0.25 (one quarter), 0.33 (one third), or 0.75 (three quarters).
Regional Notes
United States: The US customary cup (236.6 mL) and US fluid ounce (29.57 mL) are the standard for American recipes. 1 US cup = 8 US fl oz. Most American measuring cups and recipe books use this system.
United Kingdom: The UK uses imperial cups (284.1 mL) and UK fluid ounces (28.41 mL). 1 UK cup = 10 UK fl oz. This converter uses the US standard, so UK users should be aware of the difference. For UK recipes, divide UK fl oz by 10 to get UK cups.
India / Metric countries: Most Indian and metric-system countries use milliliters (mL) and liters for cooking measurements. 1 US cup = 236.6 mL. To convert from cups to mL, multiply by 236.6. For baking and precise cooking, using a digital kitchen scale in grams is recommended for consistent results across all measurement systems.
Frequently Asked Questions
How many ounces are in a cup?
There are 8 US fluid ounces in 1 US cup. This is the standard conversion used in American recipes for measuring liquid ingredients like water, milk, oil, and broth. For dry ingredients, the weight per cup varies, but for liquids, 1 cup always equals 8 fl oz.
How do you convert cups to ounces?
To convert cups to US fluid ounces, multiply the number of cups by 8. For example, 2 cups × 8 = 16 fl oz, and 0.5 cups × 8 = 4 fl oz. This simple formula works for any liquid volume measurement in US customary units.
Is a US cup the same as a UK cup?
No, a US cup is 236.6 mL while a UK (imperial) cup is 284.1 mL. The US cup equals 8 US fl oz, whereas the UK cup equals 10 UK fl oz. This calculator uses the US cup standard (8 fl oz), which is the most commonly used in American and international recipes.
Is this cups to oz converter free?
Yes, all calculators on Calculy are completely free to use with no registration required. You can convert cups to ounces as many times as you need.
Can I convert fractional cups to ounces?
Yes, you can enter fractional cup values like 0.25 (quarter cup), 0.5 (half cup), 0.33 (one-third cup), or 0.75 (three-quarters cup). The converter will accurately multiply by 8 to give you the equivalent in fluid ounces with up to 2 decimal places.
What is the difference between fluid ounces and weight ounces?
Fluid ounces (fl oz) measure volume, while ounces (oz) measure weight. 1 US cup of water weighs about 8.35 oz, but 1 US cup of flour weighs only about 4.5 oz. This converter calculates fluid ounces (volume), not weight ounces. Always use a kitchen scale for dry ingredient weight measurements.