A U.S. cup holds 8 fluid ounces. This converter is for volume; for dry ingredients measured by weight in ounces, use a weight-to-volume converter with the ingredient’s density.
How to use the Ounces to Cups Converter
- Type the number of US fluid ounces into the US fluid ounces field. Decimals such as 4 are fine.
- Read the answer in US cups. It updates as you type, with no button to press. The same amount is also shown in mL, tbsp, metric cup.
- To go from US cups back to US fluid ounces, type into the US cups field instead. Every field also has a unit menu with all 27 volume units, for example L, mL, cL, dL, m³, cm³ (cc), µL, US gal, UK gal, US dry gal.
Results update as you type, and everything is calculated in your browser.
How it works
Both units measure volume, so they are always in the same ratio: one US fluid ounce equals 0.125 US cups. The calculator multiplies the number of US fluid ounces you type by 0.125 to give US cups, and when you type into the US cups field it divides by the same factor to give US fluid ounces. Because the ratio never changes, doubling the US fluid ounces always doubles the US cups, for example 16 US fl oz is 2 US cup.
How to convert US fluid ounces to US cups
- Write down the value in US fluid ounces, for example 8 US fl oz.
- Multiply by the conversion factor 0.125 (because 1 US fluid ounce = 0.125 US cup).
- 8 × 0.125 = 1 US cup.
- To go back from US cups to US fluid ounces, divide by 0.125, or multiply by 8.
US fl oz to US cup conversion table
| US fluid ounces | US cups | US cups | US fluid ounces |
|---|---|---|---|
| 1 US fl oz | 0.125 US cup | 1 US cup | 8 US fl oz |
| 2 US fl oz | 0.25 US cup | 2 US cup | 16 US fl oz |
| 4 US fl oz | 0.5 US cup | 5 US cup | 40 US fl oz |
| 6 US fl oz | 0.75 US cup | 10 US cup | 80 US fl oz |
| 8 US fl oz | 1 US cup | 20 US cup | 160 US fl oz |
| 10 US fl oz | 1.25 US cup | 50 US cup | 400 US fl oz |
| 12 US fl oz | 1.5 US cup | 100 US cup | 800 US fl oz |
| 16 US fl oz | 2 US cup | 1,000 US cup | 8,000 US fl oz |
| 20 US fl oz | 2.5 US cup | ||
| 24 US fl oz | 3 US cup | ||
| 32 US fl oz | 4 US cup | ||
| 64 US fl oz | 8 US cup |
Volume units explained
- US fluid ounce (US fl oz)
- The U.S. fluid ounce is 1/128 of a U.S. gallon, about 29.57 mL. It is a unit of volume: a fluid ounce of water weighs about one ounce, but other liquids do not.
- US cup (US cup)
- The U.S. customary cup is 8 U.S. fluid ounces, about 236.6 mL. Recipes from Australia, Canada and New Zealand often use the 250 mL metric cup instead.
Quick mental conversion
For a fast estimate, multiply US fluid ounces by about 0.12 to get US cups; the error is about 4.0%. Use the calculator above when you need the exact figure.
Formula
1 US fl oz = 0.125 US cup
1 US cup = 8 US fl oz
US cup = US fl oz × 0.125
Worked example
Inputs: US fluid ounces: 8 US fl oz.
Results: US cups = 1 US cup; Millilitres = 236.5882365 mL; Tablespoons (US) = 16 tbsp; Metric cups = 0.94635295 metric cup.
Frequently asked questions
How many cups is 16 fl oz?
2 cups.
Is a coffee cup 8 oz?
A standard U.S. measuring cup is 8 fl oz; mugs often hold 10–12 oz.
How many US cups are in one US fluid ounce?
1 US fl oz = 0.125 US cup.
How many US fluid ounces are in one US cup?
1 US cup = 8 US fl oz.
How do I convert US fluid ounces to US cups?
Multiply the number of US fluid ounces by 0.125. For example, 8 US fl oz × 0.125 = 1 US cup.
How do I convert US cups back to US fluid ounces?
Divide by 0.125 (or multiply by 8), or simply type the value into the US cups field above.
What is 10 US fl oz in US cups?
10 US fl oz = 1.25 US cup.
What is 2 US fl oz in US cups?
2 US fl oz = 0.25 US cup.
Is the US fluid ounces to US cups conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 US fl oz = 0.125 US cup exactly, so the only difference you may see is rounding in the last displayed digit.