Ounces to Cups Converter - Convert Fluid Ounces to Cups and Cups to Ounces
Free ounces to cups converter. Convert fluid ounces (fl oz) to cups and cups to fluid ounces instantly. Bidirectional conversion with real-time results. Perfect for cooking, baking, and recipe conversions. Supports US and UK fluid ounces, and different cup types. Formula: 1 cup = 8 fl oz.
Last updated: January 23, 2026
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💡 Conversion Formula
1 cup = 8 fl oz (US). Enter fluid ounces to calculate cups, or enter cups to calculate fluid ounces.
Conversion Facts:
- • 1 cup = 8 fl oz (US standard)
- • 1 fl oz = 0.125 cups (1/8 cup)
- • 2 fl oz = 0.25 cups (1/4 cup)
- • 4 fl oz = 0.5 cups (1/2 cup)
- • 8 fl oz = 1 cup
- • 16 fl oz = 2 cups
- • Different cup types have slightly different volumes
Ounces to Cups Converter Features
Directions
Fluid Ounces → Cups and Cups → Fluid Ounces
Enter fluid ounces to calculate cups, or enter cups to calculate fluid ounces
Fluid Ounce Types
US fl oz, UK fl oz
Support for both US fluid ounces and UK (Imperial) fluid ounces
Cup Types
US cups, US legal cups
Support for US customary cups (recipes) and US legal cups (nutrition)
Speed
Instant calculations
See results immediately as you enter or change values
Use cases
Recipes, Baking, Cooking
Essential for converting recipe measurements between fluid ounces and cups
Conversion
1 cup = 8 fl oz
Simple and memorable conversion factor for quick calculations
Quick Example Result
Converting 1 US fluid ounce to cups:
Input
1 US fl oz
Result
0.125 cups
How Our Ounces to Cups Converter Works
Our ounces to cups converter is a simple and efficient tool that converts between fluid ounces (fl oz) and cups. The fundamental conversion is: 1 cup = 8 fluid ounces (US standard). This converter works bidirectionally - you can calculate cups from fluid ounces or fluid ounces from cups. It also supports different types of fluid ounces (US and UK) and different cup measurements (US customary and US legal).
How to Use the Converter
Step 1: Select Fluid Ounce Type
Choose between US fluid ounces (fl oz) or UK fluid ounces (UK fl oz). US fluid ounces are the standard in the United States, while UK fluid ounces are used in the United Kingdom and some Commonwealth countries.
Step 2: Select Cup Type
Choose the type of cup: US cups (customary, for recipes), US cups (recipes), or US legal cups (for nutrition labeling). US legal cups are slightly larger (240 ml vs 237 ml).
Step 3: Enter Fluid Ounces or Cups
Enter either the volume in fluid ounces or the volume in cups. The converter will automatically calculate the other value. You can also enter both to verify calculations.
Step 4: View Results
Results appear instantly showing the conversion, formula used, and additional conversions to milliliters and liters for reference.
How to Convert Fluid Ounces to Cups?
Converting fluid ounces to cups is straightforward. The basic formula is:
Conversion Formula
Cups = Fluid Ounces ÷ 8For example: 16 fluid ounces ÷ 8 = 2 cups
How to Convert Cups to Fluid Ounces?
Converting cups to fluid ounces is equally simple:
Conversion Formula
Fluid Ounces = Cups × 8For example: 2.5 cups × 8 = 20 fluid ounces
Fluid Ounces to Cups Conversion Chart
Here's a quick reference chart for common conversions:
| Fluid Ounces | Cups |
|---|---|
| 1 fl oz | 0.125 |
| 2 fl oz | 0.25 |
| 4 fl oz | 0.5 |
| 8 fl oz | 1 |
| 16 fl oz | 2 |
| 24 fl oz | 3 |
| 32 fl oz | 4 |
A Cup Volume Doesn't Equal Cup Volume!
It's important to understand that different types of cups have different volumes:
US Legal Cup
The measurement used in recipes, food labeling, and serving sizes. It is defined in United States law as 240 milliliters (approximately 8.11537 fl oz). This is the standard used in nutrition labels.
US Customary Cup
Slightly different (contains 236 ml) than a legal cup, is equal to half of a liquid pint. This is commonly used in recipes and equals exactly 8 fluid ounces.
Metric Cup
A little bigger than a legal cup and contains 250 ml. Used in countries that use the metric system for cooking measurements.
Coffee Cup
This cup is way different since it contains only 118 ml (about 4 fl oz). It is a measure of coffee made with 148 ml of water. Not suitable for recipe conversions!
Practical Applications
This converter is essential for various practical scenarios:
Cooking & Baking
Convert recipe measurements between fluid ounces and cups. Perfect when you need to measure out amounts for your perfect pancake or when following recipes that use different measurement systems.
Recipe Conversions
Switch between recipes that use fluid ounces and those that use cups. Essential for home bakers who work with recipes from different sources.
Nutrition Labeling
Understand serving sizes on nutrition labels, which often use US legal cups (240 ml) rather than customary cups (237 ml).
International Recipes
Convert between US and UK fluid ounces when working with recipes from different countries. UK fluid ounces are slightly different from US fluid ounces.
Need other conversion tools? Check out our ml to cups converter and volume conversion tools.
Get Custom Calculator for Your PlatformOunces to Cups Conversion Examples
Input:
- Fluid Ounces: 16 US fl oz
- Cup Type: US cups
Calculation:
- Formula: Cups = Fluid Ounces ÷ 8
- Cups = 16 ÷ 8
- Cups = 2
Result: 16 US fluid ounces = 2 cups
This is a common conversion - 16 fl oz equals exactly 2 cups.
Input:
- Cups: 2.5 US cups
- Fluid Ounce Type: US fl oz
Calculation:
- Formula: Fluid Ounces = Cups × 8
- Fluid Ounces = 2.5 × 8
- Fluid Ounces = 20
Result: 2.5 cups = 20 US fluid ounces
This represents the volume needed for 2.5 cups.
Input:
- Fluid Ounces: 6 US fl oz
- Cup Type: US cups
Calculation:
- Formula: Cups = Fluid Ounces ÷ 8
- Cups = 6 ÷ 8
- Cups = 0.75 (3/4 cup)
Result: 6 US fluid ounces = 0.75 cups (3/4 cup)
This is a common fractional measurement in recipes.
1 fl oz
=
0.125 cups
4 fl oz
=
0.5 cups
24 fl oz
=
3 cups
Frequently Asked Questions
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