💧 Volume
US cups to fl oz Converter
Convert US cups to fl oz instantly with a reference conversion table.
Quick answer: To convert US cups to fl oz, multiply by 8. For example, 1 US cups = 8 fl oz. Use the calculator below for any value.
US cups to fl oz
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Common conversions
| US cups | fl oz |
|---|
Formula:
How to convert US cups to fl oz
1
Enter your value
Type the number of us cups you want to convert into the left box. The result in fl oz appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — fl oz to US cups. Your current value carries across so you don't have to re-enter anything.
3
About US cups and fl oz
US cups and fl oz are common volume measurements.
📊 Common conversions at a glance
| US cups | fl oz |
|---|---|
| 0.125 | 1 |
| 0.25 | 2 |
| 0.333 | 2.664 |
| 0.5 | 4 |
| 0.667 | 5.336 |
| 0.75 | 6 |
Reviewed for 2026. US cups ↔ fl oz conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.