To convert cups to fluid ounces, multiply by 8. So 1 cup = 8 fl oz, 1/2 cup = 4 fl oz, and 2 cups = 16 fl oz (1 pint). This is exact: 1 US cup = 8 US fluid ounces by definition.
- Exact formula: fl oz = cups × 8. 1 cup = 8 fl oz exactly.
- 1/4 cup = 2 fl oz. 1/2 cup = 4 fl oz. 3/4 cup = 6 fl oz. 1 cup = 8 fl oz.
- 2 cups = 16 fl oz = 1 pint. 4 cups = 32 fl oz = 1 quart.
- Reverse: cups = fl oz ÷ 8.
How to use our cups to fl oz converter
Type any cup value in the cups field and the fl oz result appears instantly. Use decimals for fractions: 0.5 for half a cup. Both directions work without pressing a button.
How do you convert cups to fluid ounces?
Multiply the number of US cups by 8. The US customary cup is defined as exactly 8 fluid ounces. This makes the conversion simple and exact - no approximation involved.
$$\text{fl oz} = \text{cups} \times 8$$
Worked examples: 1/4 cup = 2 fl oz. 1/3 cup = 2.67 fl oz. 1/2 cup = 4 fl oz. 2/3 cup = 5.33 fl oz. 3/4 cup = 6 fl oz. 1 cup = 8 fl oz. 1.5 cups = 12 fl oz. 2 cups = 16 fl oz. 4 cups = 32 fl oz.
Cups to fluid ounces reference table
| Cups | Fluid Ounces | Context |
|---|---|---|
| 1/8 cup | 1 fl oz | 2 tablespoons |
| 1/4 cup | 2 fl oz | 4 tablespoons |
| 1/3 cup | 2.67 fl oz | 5 tbsp + 1 tsp |
| 1/2 cup | 4 fl oz | 8 tablespoons |
| 2/3 cup | 5.33 fl oz | - |
| 3/4 cup | 6 fl oz | 12 tablespoons |
| 1 cup | 8 fl oz | Standard cup / 1/2 pint |
| 1.5 cups | 12 fl oz | Standard US can |
| 2 cups | 16 fl oz | 1 pint |
| 4 cups | 32 fl oz | 1 quart |
| 8 cups | 64 fl oz | Half gallon |
FAQs about converting cups to fl oz
How many fl oz is 1 cup?
1 US cup equals exactly 8 US fluid ounces. This is not an approximation - the cup is defined as 8 fl oz in the US customary system.
How many fl oz is 2 cups?
2 cups equals 16 fl oz. 2 × 8 = 16 fl oz. This is also 1 US pint.
How many cups is 12 fl oz?
12 fl oz equals 1.5 cups. 12 ÷ 8 = 1.5 cups. A standard 12 fl oz US soda or beer can is 1.5 cups of liquid.
How many fl oz is a half cup?
Half a cup equals 4 fl oz. 0.5 × 8 = 4 fl oz. This is also 8 tablespoons or 24 teaspoons.