US cups to US fluid ounces
US cups to US fluid ounces (cup (US) to fl oz (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 cup = 8 US fluid ounces
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 cup (US) = 8 fl oz (US)
- 5 cup (US) = 40 fl oz (US)
- 10 cup (US) = 80 fl oz (US)
- 25 cup (US) = 200 fl oz (US)
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How it’s calculated
A US cup holds exactly 8 US fluid ounces (236.588 mL). A UK (imperial) cup is 10 imperial fl oz (284.1 mL), and a metric cup is 250 mL, about 8.45 US fl oz. These are fluid ounces (volume), not weight ounces.
1 cup (US) = 8 fl oz (US) (exact) · 1 fl oz (US) = 0.125 cup (US) (exact)
fl oz (US) = cup (US) × 8
- Multiply the value in US cups by 8.
- To go back, divide by 8 (or multiply by 0.125).
- 1 cup (US) = 8 fl oz (US) · 1 fl oz (US) = 0.125 cup (US)
Step by step
Find the conversion factor
By definition 1 cup (US) = 0.0002365882365 m³ and 1 fl oz (US) = 0.0000295735295625 m³, so 1 cup (US) = 8 fl oz (US). Source: NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put cup (US) in the denominator so it cancels, leaving fl oz (US).
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 8 fl oz (US)
Formula: fl oz (US) = cup (US) × 8. Factors last reviewed 2026-10-27.
US cups to US fluid ounces conversion table
1 US cup = 8 US fluid ounces · 1 fl oz (US) = 0.125 cup (US)
- 1 US cup = 8 US fluid ounces
- 5 US cups = 40 US fluid ounces
- 10 US cups = 80 US fluid ounces
- 25 US cups = 200 US fluid ounces
- 100 US cups = 800 US fluid ounces
| US cups (cup (US)) | US fluid ounces (fl oz (US)) |
|---|---|
| 0.125 cup (US) | 1 fl oz (US) |
| 0.25 cup (US) | 2 fl oz (US) |
| 0.3333333333 cup (US) | 2.6667 fl oz (US) |
| 0.5 cup (US) | 4 fl oz (US) |
| 0.6666666667 cup (US) | 5.3333 fl oz (US) |
| 0.75 cup (US) | 6 fl oz (US) |
| 1 cup (US) | 8 fl oz (US) |
| 1.5 cup (US) | 12 fl oz (US) |
| 2 cup (US) | 16 fl oz (US) |
| 3 cup (US) | 24 fl oz (US) |
| 4 cup (US) | 32 fl oz (US) |
| 5 cup (US) | 40 fl oz (US) |
| 6 cup (US) | 48 fl oz (US) |
| 8 cup (US) | 64 fl oz (US) |
FAQ
How do I convert US cups to US fluid ounces?
Use fl oz (US) = cup (US) × 8. Multiply the value in US cups by 8.
How many US fluid ounces are in 1 US cup?
1 US cup (cup (US)) equals 8 US fluid ounces (fl oz (US)).
How many US cups are in 1 US fluid ounce?
1 US fluid ounce (fl oz (US)) equals 0.125 US cups (cup (US)).
What is 10 cup (US) in fl oz (US)?
10 US cups = 80 US fluid ounces.
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.
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.
What is a 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.
About these units
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
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