Oz to Cups Converter
Convert fluid ounces to cups and cups to ounces. Supports US fluid ounces, UK fluid ounces, and multiple cup types.
Volume Converter
Quick conversions:
Understanding Oz to Cups Conversion
What is the Basic Conversion?
The most common conversion is 1 cup = 8 fluid ounces (US customary). This means:
- To convert oz to cups: divide the number of ounces by 8
- To convert cups to oz: multiply the number of cups by 8
For example, 16 oz ÷ 8 = 2 cups, and 3 cups × 8 = 24 oz.
Different Types of Cups
Not all cups are created equal! There are three main cup measurements:
US Customary Cup
236.588 ml
Used in cooking and baking recipes
US Legal Cup
240 ml
Used on nutrition labels
Metric Cup
250 ml
Used in Australia, NZ, Canada
US vs UK Fluid Ounces
US and UK fluid ounces are slightly different:
- US fluid ounce: 29.5735 ml
- UK/Imperial fluid ounce: 28.4131 ml
The UK fl oz is about 4% smaller than the US fl oz. This difference matters for precise measurements in baking and scientific applications.
Quick Reference Guide
Common Oz to Cups:
- 4 oz = ½ cup
- 6 oz = ¾ cup
- 8 oz = 1 cup
- 12 oz = 1½ cups
- 16 oz = 2 cups (1 pint)
- 32 oz = 4 cups (1 quart)
Common Cups to Oz:
- ¼ cup = 2 oz
- ⅓ cup = 2.67 oz
- ½ cup = 4 oz
- ⅔ cup = 5.33 oz
- ¾ cup = 6 oz
- 1 cup = 8 oz
When Does Cup Type Matter?
For most home cooking, the difference between cup types is negligible. However, cup type matters when:
- Precise baking: Especially for delicate pastries and bread
- Following international recipes: Australian recipes use metric cups
- Reading nutrition labels: US labels use the legal cup (240 ml)
- Scientific measurements: Require exact volumes
Frequently Asked Questions
How many cups is 8 oz?
8 fluid ounces equals exactly 1 US customary cup. This is the standard conversion used in most American recipes.
How many oz in a cup?
A US customary cup contains 8 fluid ounces. A US legal cup (used for nutrition labels) is 8.115 fl oz, and a metric cup is about 8.45 fl oz.
Is 16 oz the same as 2 cups?
Yes, 16 fluid ounces equals 2 US customary cups. This is also equal to 1 US pint.
How many cups is 32 oz?
32 fluid ounces equals 4 US customary cups, which is also 1 US quart or ¼ gallon.
What's the difference between fluid ounces and ounces?
Fluid ounces measure volume (liquid capacity), while ounces (oz) measure weight/mass. 8 fluid ounces of water weighs about 8.3 ounces by weight.
Are UK and US fluid ounces the same?
No, UK (Imperial) fluid ounces are slightly smaller. 1 US fl oz = 29.57 ml, while 1 UK fl oz = 28.41 ml.
How do I measure oz without a measuring cup?
You can use these approximations: 2 tablespoons = 1 fl oz, a shot glass is typically 1.5 fl oz, and a standard coffee mug is about 8-12 fl oz.
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