US fluid ounces to imperial fluid ounces
Type a value in US fluid ounces to see it in imperial fluid ounces straight away, or type in the second box to convert back.
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How to use it
- Type the value in the US fluid ounces box.
- Read the result in imperial fluid ounces as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
fl oz (imp) = fl oz (US) × 1.040842731
Multiply the value in US fluid ounces by 1.040842731 to get imperial fluid ounces.
Example
To convert 25 fl oz (US) to imperial fluid ounces: 25 × 1.040842731 = 26.0211 fl oz (imp).
Conversion table
| US fluid ounces (fl oz (US)) | Imperial fluid ounces (fl oz (imp)) |
|---|---|
| 1 | 1.04084 |
| 2 | 2.08169 |
| 3 | 3.12253 |
| 5 | 5.20421 |
| 10 | 10.4084 |
| 20 | 20.8169 |
| 25 | 26.0211 |
| 50 | 52.0421 |
| 100 | 104.084 |
| 250 | 260.211 |
| 500 | 520.421 |
| 1,000 | 1,040.84 |
About the units
- US fluid ounce
- The US fluid ounce is 1/128 of a US gallon, exactly 29.5735295625 milliliters.
- Imperial fluid ounce
- The imperial fluid ounce is 1/160 of an imperial gallon, exactly 28.4130625 milliliters.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many imperial fluid ounces are in one US fluid ounce?
1 fl oz (US) = 1.04084 fl oz (imp) exactly.
How do I convert US fluid ounces to imperial fluid ounces?
Use fl oz (imp) = fl oz (US) × 1.040842731. For example, 25 fl oz (US) = 26.0211 fl oz (imp).
How many US fluid ounces are in one imperial fluid ounce?
1 fl oz (imp) = 0.96076 fl oz (US).
What is the difference between a US gallon and an imperial gallon?
A US gallon is 3.785411784 liters and the imperial gallon used in the UK is 4.54609 liters, about 20% larger. Check where a figure comes from before converting, since US sources mean the US gallon.
How many milliliters are in a cup?
The US customary cup used in recipes is 236.5882365 mL and the metric cup is 250 mL. US nutrition labels round the cup to 240 mL, so the figure differs slightly between sources.