Whether you are scaling a recipe, tracking daily water intake, or figuring out what size cup to use for a 24 oz smoothie, the math always starts in the same place: 1 US cup equals 8 fluid ounces. Use the calculator below for any value, or browse the reference table and individual conversion guides further down the page for the specific numbers you need.
One note before you calculate: this page uses US fluid ounces and US cups throughout. If you are working with a recipe from Australia or Canada, their metric cup is 250 ml — slightly larger than the US cup at 236.6 ml — which will produce different results for the same number of cups.
Oz to Cups Calculator
Conversion Formula
To convert fluid ounces to cups, divide the ounce value by 8.
Quick Tips
- Liquid vs Dry: This calculator is for fluid volume. For dry ingredients (like flour), the weight-to-volume ratio varies.
- US Standard: 1 US Cup is exactly 8 US Fluid Ounces.
- Accuracy: For professional baking, always check if your recipe uses Metric cups (250ml).
| Ounces (fl oz) | Cups (US Standard) | Notes |
|---|---|---|
| 1 oz | 1/8 cup (0.125) | 2 tablespoons |
| 2 oz | 1/4 cup (0.25) | 4 tablespoons |
| 4 oz | 1/2 cup (0.5) | Standard small measure |
| 8 oz | 1 cup | Most common serving |
| 12 oz | 1.5 cups | Standard soda can volume |
| 16 oz | 2 cups | 1 pint / 1 pound (water) |
| 24 oz | 3 cups | Large smoothie size |
| 32 oz | 4 cups | 1 quart |
* Note: These conversions are based on US Fluid Ounces.
Ounces to Cups Conversion
Converting ounces to cups is one of the most common kitchen measurement needs. Since 1 cup equals 8 fluid ounces, quick conversion helps simplify recipes, portion calculations, and beverage preparation.
Converter FAQ
How accurate is this cups to oz calculator?
Why does the result change when I select "Metric Cup"?
Deep Dive: Specific Conversions
Exactly how many cups is 5 oz?
Read our full guide: How Many Cups is 5 oz? Between Two Landmarks
What is 34 oz in cups?
Read our full guide: How Many Cups is 34 oz? The Extra Quarter-Cup After the Quart
