US fluid ounces to US cups
US fluid ounces to US cups (fl oz (US) to cup (US)) Converter
Convert from
- US cupscup (US)
- MillilitresmL
- Metric cupscup (metric)
- Imperial cups (UK)cup (UK)
- US tablespoonstbsp (US)
- Metric tablespoonstbsp (metric)
- US teaspoonstsp (US)
- Metric teaspoonstsp (metric)
- US fluid ouncesfl oz (US)
- Imperial fluid ounces (UK)fl oz (UK)
- LitresL
- US liquid pintspt (US)
- Imperial pints (UK)pt (UK)
- US liquid quartsqt (US)
- DecilitresdL
- Cubic metresm³
- US gallonsgal (US)
- Imperial gallons (UK)gal (UK)
- Imperial quarts (UK)qt (UK)
- Cubic inchesin³
- Cubic feetft³
- Cubic yardsyd³
- Oil barrels (US)bbl
1 US fluid ounce = 0.125 US cups
Default is 5 significant figures. “Units typed as” decides what words like gallon, pint or cup mean when you type them. Scientific input such as 1e15 or 2.5e-3 works in the value box; type unit names or a whole conversion in the unit picker’s search.
- 1 fl oz (US) = 0.125 cup (US)
- 5 fl oz (US) = 0.625 cup (US)
- 10 fl oz (US) = 1.25 cup (US)
- 25 fl oz (US) = 3.125 cup (US)
Shortcuts: / value box · S swap · Esc close the picker · Alt+C copy · Alt+L link · Alt+F favourite
How it’s calculated
Divide US fluid ounces by 8 to get US cups. Imperial fluid ounces (28.41 mL) are about 4% smaller than US ones (29.57 mL), so UK recipes need the UK units.
1 fl oz (US) = 0.125 cup (US) (exact) · 1 cup (US) = 8 fl oz (US) (exact)
cup (US) = fl oz (US) ÷ 8
- Divide the value in US fluid ounces by 8.
- Equivalently, multiply by 0.125.
- 1 fl oz (US) = 0.125 cup (US) · 1 cup (US) = 8 fl oz (US)
Step by step
Find the conversion factor
By definition 1 fl oz (US) = 0.0000295735295625 m³ and 1 cup (US) = 0.0002365882365 m³, so 1 cup (US) = 8 fl oz (US). Source: NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put fl oz (US) in the denominator so it cancels, leaving cup (US).
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.125 cup (US)
Formula: cup (US) = fl oz (US) ÷ 8. Factors last reviewed 2026-10-27.
US fluid ounces to US cups conversion table
1 US fluid ounce = 0.125 US cups · 1 cup (US) = 8 fl oz (US)
- 1 US fluid ounce = 0.125 US cups
- 5 US fluid ounces = 0.625 US cups
- 10 US fluid ounces = 1.25 US cups
- 25 US fluid ounces = 3.125 US cups
- 100 US fluid ounces = 12.5 US cups
| US fluid ounces (fl oz (US)) | US cups (cup (US)) |
|---|---|
| 0.125 fl oz (US) | 0.015625 cup (US) |
| 0.25 fl oz (US) | 0.03125 cup (US) |
| 0.3333333333 fl oz (US) | 0.041667 cup (US) |
| 0.5 fl oz (US) | 0.0625 cup (US) |
| 0.6666666667 fl oz (US) | 0.083333 cup (US) |
| 0.75 fl oz (US) | 0.09375 cup (US) |
| 1 fl oz (US) | 0.125 cup (US) |
| 1.5 fl oz (US) | 0.1875 cup (US) |
| 2 fl oz (US) | 0.25 cup (US) |
| 3 fl oz (US) | 0.375 cup (US) |
| 4 fl oz (US) | 0.5 cup (US) |
| 5 fl oz (US) | 0.625 cup (US) |
| 6 fl oz (US) | 0.75 cup (US) |
| 8 fl oz (US) | 1 cup (US) |
FAQ
How do I convert US fluid ounces to US cups?
Use cup (US) = fl oz (US) ÷ 8. Divide the value in US fluid ounces by 8.
How many US cups are in 1 US fluid ounce?
1 US fluid ounce (fl oz (US)) equals 0.125 US cups (cup (US)).
How many US fluid ounces are in 1 US cup?
1 US cup (cup (US)) equals 8 US fluid ounces (fl oz (US)).
What is 10 fl oz (US) in cup (US)?
10 US fluid ounces = 1.25 US cups.
Is the US fluid ounce a US or a UK unit?
Unitglide uses the US customary US fluid ounce. Defined as exactly 1/128 US gallon = 29.5735295625 mL. US and UK units with the same name can differ, so check which one your source uses.
Is the US cup a US or a UK unit?
Unitglide uses the US customary US cup. The US cup used in recipes: one sixteenth of a US gallon, about 236.59 mL. US nutrition labels round it to 240 mL. US and UK units with the same name can differ, so check which one your source uses.
What is a US fluid ounce?
Defined as exactly 1/128 US gallon = 29.5735295625 mL.
About these units
US fluid ounce (fl oz (US))
US customary
1 fl oz (US) = 0.0000295735295625 m³ (exact)
Defined as exactly 1/128 US gallon = 29.5735295625 mL.
Source: NIST SP 811 / Handbook 44
US cup (cup (US))
US customary
1 cup (US) = 0.0002365882365 m³ (exact)
The US cup used in recipes: one sixteenth of a US gallon, about 236.59 mL. US nutrition labels round it to 240 mL.
Source: NIST SP 811 / Handbook 44