Cups to Oz Converter
fl oz = cups × 8 | oz → cups: cups = fl oz ÷ 8Common Cups to Oz Conversions
These are the most frequently needed cups-to-ounces values for cooking, baking, and beverage preparation:
- ¼ cup to oz: 0.25 × 8 = 2 fl oz
- ⅓ cup to oz: 0.333 × 8 = 2.67 fl oz
- ½ cup to oz: 0.5 × 8 = 4 fl oz
- ⅔ cup to oz: 0.667 × 8 = 5.33 fl oz
- ¾ cup to oz: 0.75 × 8 = 6 fl oz
- 1 cup to oz: 1 × 8 = 8 fl oz
- 1.5 cups to oz: 1.5 × 8 = 12 fl oz
- 2 cups to oz: 2 × 8 = 16 fl oz (1 pint)
- 4 cups to oz: 4 × 8 = 32 fl oz (1 quart)
- 8 cups to oz: 8 × 8 = 64 fl oz (½ gallon)
- 16 cups to oz: 16 × 8 = 128 fl oz (1 gallon)
Cups to Oz Conversion Chart
Full reference table covering fractions of a cup through 16 cups (one gallon):
| Cups (c) | Fluid Oz (fl oz) | Milliliters (mL) | Equivalent |
|---|---|---|---|
| ⅛ cup | 1 fl oz | 29.57 mL | 2 tbsp |
| ¼ cup | 2 fl oz | 59.15 mL | 4 tbsp |
| ⅓ cup | 2.67 fl oz | 78.86 mL | 5 tbsp + 1 tsp |
| ½ cup | 4 fl oz | 118.3 mL | 8 tbsp |
| ⅔ cup | 5.33 fl oz | 157.7 mL | 10 tbsp + 2 tsp |
| ¾ cup | 6 fl oz | 177.4 mL | 12 tbsp |
| 1 cup | 8 fl oz | 236.6 mL | 16 tbsp |
| 1¼ cups | 10 fl oz | 295.7 mL | — |
| 1½ cups | 12 fl oz | 354.9 mL | — |
| 1¾ cups | 14 fl oz | 414.0 mL | — |
| 2 cups | 16 fl oz | 473.2 mL | 1 pint |
| 3 cups | 24 fl oz | 709.8 mL | — |
| 4 cups | 32 fl oz | 946.4 mL | 1 quart |
| 6 cups | 48 fl oz | 1,420 mL | — |
| 8 cups | 64 fl oz | 1,893 mL | ½ gallon |
| 12 cups | 96 fl oz | 2,839 mL | ¾ gallon |
| 16 cups | 128 fl oz | 3,785 mL | 1 gallon |
How to Convert Cups to Ounces
The conversion is a single multiplication — and one of the easiest in the US customary system:
The number 8 comes from the US customary hierarchy: 1 cup = 8 tablespoons × 2 = wait — more directly, the cup is defined as ½ pint, and 1 pint = 16 fl oz, so 1 cup = 8 fl oz. Clean, consistent, easy to remember.
Examples
- Convert 3.5 cups: 3.5 × 8 = 28 fl oz
- Convert 20 fl oz to cups: 20 ÷ 8 = 2.5 cups
- Convert 6 cups to gallons: 6 cups = 48 fl oz ÷ 128 = 0.375 gallons
For gallon-scale conversions from fluid ounces, use our oz to gallon converter.
Kitchen Uses & Practical Examples
Scaling Recipes
When a recipe calls for "2 cups of broth" and your measuring equipment only shows fl oz, you need 16 fl oz. If you're doubling the recipe: 4 cups = 32 fl oz — which is exactly one 32 oz carton of broth. Knowing cups-to-oz instantly removes the guesswork.
Beverage Preparation
Standard US drinking glasses hold 8–16 fl oz (1–2 cups). A typical pitcher holds 2 quarts (64 fl oz = 8 cups). When making a batch of lemonade for 8 people at 8 fl oz each, you need 64 fl oz — exactly 8 cups or half a gallon.
Baking Precision
Liquid ingredients in baking — milk, buttermilk, cream, oil — are almost always measured by volume (fl oz or cups). When converting a recipe that uses one unit system to another, cups-to-oz is your most-used conversion. A ¾ cup of milk = 6 fl oz every time, no matter the recipe source.
Cups in the US Volume Hierarchy
Understanding where the cup sits in the broader measurement system makes all conversions easier:
= 4 quarts (32 fl oz each)
= 8 pints (16 fl oz each)
= 16 cups (8 fl oz each)
= 256 tablespoons (½ fl oz each)
This hierarchy means: 16 cups = 1 gallon. So if a recipe calls for 16 cups of liquid, that's a full gallon. Use the gallon to oz tool for large-batch scaling.
For a complete reference of all liquid unit relationships, see: Liquid Measurement Conversion Chart.
Official US customary volume definitions: National Institute of Standards and Technology (NIST).