Cup to Fluid ounce Converter
Enter the value that you want to convert cup (cup) to fluid ounce (fl oz) or fluid ounce to cup.Also written as CUP to FL OZ conversion.
1 cup = 8.3267418 fluid ounce
Formula: fluid ounce = cup value × 8.3267418
CUP to FL OZ — cup to fluid ounce
10 cup = 83.26742 fluid ounce
Popular Volume Converters:
How Cup Relates to Fluid ounce
The Cup Explained
Cup (cup) is a unit of volume measurement. 1 cup is equal to 8.3267418 fluid ounce.
The Fluid ounce Explained
Fluid ounce (fl oz) is a unit of volume measurement. 1 fluid ounce is equal to 0.1200950 cup.
Volume Measurement Systems
Volume units are particularly confusing because the US and UK gallons differ (US gallon = 3.785 L, UK gallon = 4.546 L), as do their pints, cups, and fluid ounces. Cooking, fuel economy, beverage production, and pharmaceutical compounding all require precise volume conversions. Laboratory work uses milliliters and liters while US recipes specify cups, tablespoons, and fluid ounces.
cup to fluid ounce metric conversion table
| 0.01 cup | = | 0.08327 fl oz |
| 0.1 cup | = | 0.83267 fl oz |
| 1 cup | = | 8.32674 fl oz |
| 2 cup | = | 16.65348 fl oz |
| 3 cup | = | 24.98023 fl oz |
| 4 cup | = | 33.30697 fl oz |
| 5 cup | = | 41.63371 fl oz |
| 6 cup | = | 49.96045 fl oz |
| 7 cup | = | 58.28719 fl oz |
| 8 cup | = | 66.61393 fl oz |
| 9 cup | = | 74.94068 fl oz |
| 10 cup | = | 83.26742 fl oz |
| 11 cup | = | 91.59416 fl oz |
| 12 cup | = | 99.92090 fl oz |
| 13 cup | = | 108.24764 fl oz |
| 14 cup | = | 116.57439 fl oz |
| 15 cup | = | 124.90113 fl oz |
| 16 cup | = | 133.22787 fl oz |
| 17 cup | = | 141.55461 fl oz |
| 18 cup | = | 149.88135 fl oz |
| 19 cup | = | 158.20810 fl oz |
| 20 cup | = | 166.53484 fl oz |
| 30 cup | = | 249.80226 fl oz |
| 40 cup | = | 333.06967 fl oz |
| 50 cup | = | 416.33709 fl oz |
| 60 cup | = | 499.60451 fl oz |
| 70 cup | = | 582.87193 fl oz |
| 80 cup | = | 666.13935 fl oz |
| 90 cup | = | 749.40677 fl oz |
| 100 cup | = | 832.67418 fl oz |
| 200 cup | = | 1665.34837 fl oz |
| 300 cup | = | 2498.02255 fl oz |
| 400 cup | = | 3330.69674 fl oz |
| 500 cup | = | 4163.37092 fl oz |
| 600 cup | = | 4996.04511 fl oz |
| 700 cup | = | 5828.71929 fl oz |
| 800 cup | = | 6661.39348 fl oz |
| 900 cup | = | 7494.06766 fl oz |
| 1000 cup | = | 8326.74185 fl oz |
How to Convert CUP to FL OZ (Cup to Fluid ounce)?
We can convert cup to fluid ounce by using an example.
Example:
Convert 20 Cup to Fluid ounce?
We know 1 Cup = 8.3267418 fluid ounce; 1 Fluid ounce = 0.1200950 cup.
20 cup = ___fl oz
20 × 8.3267418 = 166.53484 fl oz (we know 1 cup = 8.3267418 fluid ounce)
Answer:
20 cup = 166.53484 fluid ounce
How to Convert Cups to Fluid Ounces (Step-by-Step)
Converting US cups to fluid ounces is one of the most fundamental kitchen conversions. One US cup equals exactly 8 fluid ounces. This clean relationship makes it one of the easiest volume conversions to remember and use for cooking, portion control, and nutrition tracking.
- Write down the measurement in cups (include fractions).
- Multiply by 8 to get fluid ounces.
- The result is the volume in US fluid ounces.
- For common fractions: ¼ cup = 2 oz, ½ cup = 4 oz, ¾ cup = 6 oz.
Cups to Fluid Ounces Quick Reference
Standard cup measurements and their fluid ounce equivalents for cooking and portion sizing:
| Cup | Fluid ounce |
|---|---|
| ⅛ cup | 1 fl oz |
| ¼ cup | 2 fl oz |
| ⅓ cup | 2.67 fl oz |
| ½ cup | 4 fl oz |
| ¾ cup | 6 fl oz |
| 1 cup | 8 fl oz |
| 1½ cups | 12 fl oz |
| 2 cups | 16 fl oz |
Solved Examples: Cups to Fluid Ounces
Question 1: A smoothie recipe makes 2½ cups. How many fluid ounces?
Solution:
Fluid ounces = cups × 8
= 2.5 × 8
= 20 fluid ounces
Answer: 2½ cups = 20 fluid ounces.
Question 2: A nutritionist recommends 8 cups of water daily. How many ounces?
Solution:
Fluid ounces = 8 × 8
= 64 fluid ounces
Answer: 8 cups = 64 fluid ounces (about 1.9 liters).
Question 3: Convert ⅔ cup of cream to fluid ounces.
Solution:
Fluid ounces = ⅔ × 8
= 5.33 fluid ounces
Answer: ⅔ cup = 5⅓ fluid ounces.
Question 4: A soup recipe yields 6 cups. Express in fluid ounces.
Solution:
Fluid ounces = 6 × 8
= 48 fluid ounces
Answer: 6 cups = 48 fluid ounces (= 3 pints = 1.5 quarts).
Practice Questions
Try solving these on your own to test your understanding:
- How many fluid ounces in 3 cups? (Answer: 24 fl oz)
- Convert 1¾ cups to fluid ounces. (Answer: 14 fl oz)
- How many ounces in 5 cups of water? (Answer: 40 fl oz)
- A bowl holds 1⅓ cups. Express in fluid ounces. (Answer: 10.67 fl oz)
- Convert 4 cups to fluid ounces. (Answer: 32 fl oz = 1 quart)
The "8 Glasses a Day" Rule Explained
The common health advice to drink "8 glasses of water per day" typically means 8 eight-ounce glasses = 64 fl oz = 8 cups = about 1.9 liters. However, the National Academies of Sciences recommends about 3.7 L (125 oz / 15.6 cups) for men and 2.7 L (91 oz / 11.4 cups) for women from all sources including food. About 20% of daily water intake comes from food, so the drinking target is lower.
Portion Sizes: Cups vs. Ounces on Nutrition Labels
FDA nutrition labels specify serving sizes in both cups and fluid ounces for liquids. Standard portions: cereal = 1 cup (8 oz dry volume), milk = 1 cup (8 fl oz), juice = ¾ cup (6 fl oz), soup = 1 cup (8 fl oz). Understanding cups-to-ounces helps you quickly assess how many servings are in a container. A 48-oz bottle of juice = 6 cups = 8 servings at ¾ cup each.
US Measurement Ladder: Cups to Gallons
The US liquid volume system is built on powers of 2: 8 fl oz = 1 cup, 2 cups = 1 pint (16 oz), 2 pints = 1 quart (32 oz), 4 quarts = 1 gallon (128 oz). Memorizing "8 ounces per cup" unlocks the entire chain. A gallon = 16 cups = 128 oz. This ladder system makes halving and doubling easy but creates odd fractions when dividing by 3.
Key Takeaways
- 1 cup = 8 fluid ounces exactly (the cleanest US volume conversion).
- Key fractions: ¼ cup = 2 oz, ½ cup = 4 oz, ¾ cup = 6 oz.
- 8 cups = 64 oz = recommended daily water intake (minimum).
- The measurement ladder: 8 oz → 1 cup → 1 pint → 1 quart → 1 gallon.
- 2 cups = 1 pint = 16 oz; 4 cups = 1 quart = 32 oz.
- FDA serving sizes use both cups and ounces for consumer clarity.
Cup to Fluid ounce Conversion Formula
fluid ounce = cup × 8.3267418
1 cup = 8.3267418 fluid ounce
1 fluid ounce = 0.1200950 cup
Reverse: cup = fluid ounce × 0.1200950
Frequently Asked Questions
How many fluid ounce are in 1 cup?
There are 8.3267418 fluid ounce in 1 cup. To convert cup to fluid ounce, multiply the value by 8.3267418.
How do I convert cup to fluid ounce?
Multiply your cup value by 8.3267418 to get the equivalent in fluid ounce. For example, 5 cup = 5 × 8.3267418 = 41.63371 fluid ounce.
How do I convert fluid ounce to cup?
Multiply your fluid ounce value by 0.1200950 to get the equivalent in cup. Alternatively, divide by 8.3267418.
What is 10 cup in fluid ounce?
10 cup is equal to 83.26742 fluid ounce.
What is 100 cup in fluid ounce?
100 cup is equal to 832.67418 fluid ounce.