Ounces to Cups Converter
Convert fluid ounces to cups, or cups to fluid ounces, with tablespoons, milliliters, pints and quarts, using US measures.
Results
| Item | Value |
|---|
Quick Answer
There are 8 fluid ounces in a cup, so divide fluid ounces by 8 to get cups: 4 fl oz is 1/2 cup, 12 fl oz is 1 1/2 cups, 16 fl oz is 2 cups and 32 fl oz is 4 cups. To turn cups into ounces, multiply by 8: 3 cups is 24 fl oz. One fluid ounce is 29.57 mL.
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Table of Contents
- Ounces to Cups Converter
- Quick Answer
- Related Calculators
- How This Ounces to Cups Converter Works
- How to Use the Ounces to Cups Converter
- Ounces to Cups Formulas
- Key Terms
- Worked Example
- Real-Life Examples
- Fluid Ounce vs Cup
- Ounces to Cups Chart
- Fluid Ounces vs Ounces of Weight
- Common Mistakes to Avoid
- Frequently Asked Questions
- References & Sources
How This Ounces to Cups Converter Works
Drink bottles, baby bottles, measuring jugs and many recipes use fluid ounces, while others use cups. Choose the direction, enter the amount and press Calculate. The converter gives cups to three decimal places (or fluid ounces), plus tablespoons, milliliters, pints and quarts.
Quick explanation: 1 cup = 8 fluid ounces.
- fl oz to cups: divide by 8.
- cups to fl oz: multiply by 8.
- Tablespoons: 1 fl oz = 2 tbsp, so 1 cup = 16 tbsp.
How to Use the Ounces to Cups Converter
- Choose fluid ounces to cups or cups to fluid ounces.
- Enter the amount.
- Press Calculate.
- Read the converted amount, plus tablespoons, mL, pints and quarts.
Ounces to Cups Formulas
- Definition: 1 US cup = 8 US fluid ounces
- Cups from fluid ounces: cups = fl oz ÷ 8
- Fluid ounces from cups: fl oz = cups × 8
- Tablespoons: tbsp = fl oz × 2
- Milliliters: mL = fl oz × 29.5735
Key Terms
- Fluid ounce (fl oz): a US unit of volume, 29.57 mL.
- Cup: 8 fl oz, 236.6 mL.
- Tablespoon (tbsp): half a fluid ounce.
- Pint (pt): 16 fl oz.
- Ounce (oz): a unit of weight, 28.35 g, not volume.
Worked Example
You drink a 20 fl oz bottle of water. How many cups is that?
- 20 ÷ 8 = 2.5 cups
- In milliliters: 20 × 29.57 = 591 mL
- In pints: 20 ÷ 16 = 1.25 pints
Going the other way, a recipe needing 3/4 cup of milk needs 0.75 × 8 = 6 fl oz.
Real-Life Examples
- Drinks: a 12 fl oz can is 1.5 cups.
- Baby bottles: 6 fl oz is 3/4 cup, or 177 mL.
- Coffee: a 16 fl oz mug is 2 cups.
- Recipes: 1/3 cup is about 2.67 fl oz.
Fluid Ounce vs Cup
- Fluid ounce (fl oz): 29.57 mL; 2 tablespoons.
- Cup: 8 fl oz, 236.6 mL.
- Pint: 16 fl oz or 2 cups.
Ounces to Cups Chart
US measures: 8 fl oz = 1 cup.
| Fluid ounces | Cups | Tablespoons | Milliliters |
|---|---|---|---|
| 1 fl oz | 0.125 cups | 2 tbsp | 29.6 mL |
| 2 fl oz | 0.25 cups | 4 tbsp | 59.1 mL |
| 3 fl oz | 0.375 cups | 6 tbsp | 88.7 mL |
| 4 fl oz | 0.5 cups | 8 tbsp | 118.3 mL |
| 6 fl oz | 0.75 cups | 12 tbsp | 177.4 mL |
| 8 fl oz | 1 cups | 16 tbsp | 236.6 mL |
| 10 fl oz | 1.25 cups | 20 tbsp | 295.7 mL |
| 12 fl oz | 1.5 cups | 24 tbsp | 354.9 mL |
| 16 fl oz | 2 cups | 32 tbsp | 473.2 mL |
| 20 fl oz | 2.5 cups | 40 tbsp | 591.5 mL |
| 24 fl oz | 3 cups | 48 tbsp | 709.8 mL |
| 32 fl oz | 4 cups | 64 tbsp | 946.4 mL |
| 48 fl oz | 6 cups | 96 tbsp | 1419.5 mL |
| 64 fl oz | 8 cups | 128 tbsp | 1892.7 mL |
Fluid Ounces vs Ounces of Weight
The word ounce causes more kitchen mistakes than any other unit. A fluid ounce measures volume, the space a liquid takes up. An ounce on a scale measures weight. Only for water and liquids like it are the two close: 8 fl oz of water weighs about 8.3 oz. A cup of flour weighs about 4.4 oz, and a cup of honey about 12 oz, so “8 oz of flour” is nearly 2 cups, not 1.
Use this converter when a recipe or label says “fl oz”, or when the ingredient is a liquid measured in a jug. For dry ingredients given in ounces of weight, weigh them, or convert grams to cups with ingredient-specific data. Also note that the US and UK fluid ounces differ slightly (29.57 mL against 28.41 mL), and a UK cup in older recipes may be 10 UK fl oz.
Common Mistakes to Avoid
- Using weight ounces for dry ingredients. 8 oz of flour is not 1 cup.
- Thinking a cup is 10 oz. A US cup is 8 fl oz.
- Mixing UK and US ounces. UK fluid ounces are about 4% smaller.
- Rounding mL to 30 per ounce for big amounts. 64 fl oz is 1,893 mL.
- Confusing pints. A US pint is 16 fl oz; a UK pint is 20.
Frequently Asked Questions
There are 8 fluid ounces in a US cup.
Divide fluid ounces by 8.
16 fl oz is 2 cups.
12 fl oz is 1.5 cups.
32 fl oz is 4 cups, one quart.
3/4 cup is 6 fl oz.
1/2 cup is 4 fl oz.
64 fl oz is 8 cups, half a gallon.
No. 8 oz by weight of flour is about 1.8 cups.
References & Sources
| Source | Used For | Link |
|---|---|---|
| NIST Handbook 44, Appendix C: General Tables of Units of Measurement | US cup of 8 fluid ounces and the fluid ounce in milliliters. | https://www.nist.gov/pml/owm/nist-handbook-44-current-edition |
| NIST, Guide to the SI, Appendix B.8 | US fluid ounce = 29.57353 mL. | https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8 |