US fluid ounce to Imperial fluid ounce
Convert US fluid ounce (US fl oz) to Imperial fluid ounce (Imp fl oz). Use an editable volume converter, conversion formula, and reference table.
1 US fl oz = 1.040842731 Imp fl oz
Conversion formula
One US fluid ounce equals 1.040842731 Imperial fluid ounce. Multiply your value in US fluid ounce by this factor to get Imperial fluid ounce. For the reverse conversion, divide by the same factor.
Worked example
To convert 5 US fluid ounce:5 × 1.040842731 = 5.204213654 Imp fl oz
Conversion table
| US fluid ounce (US fl oz) | Imperial fluid ounce (Imp fl oz) |
|---|---|
| 0.01 | 0.01040842731 |
| 0.1 | 0.1040842731 |
| 1 | 1.040842731 |
| 2 | 2.081685462 |
| 5 | 5.204213654 |
| 10 | 10.40842731 |
| 25 | 26.02106827 |
| 50 | 52.04213654 |
| 100 | 104.0842731 |
| 1000 | 1,040.842731 |
About these measurements
Volume describes three-dimensional space or liquid capacity.
The base reference used here is the liter. One US fluid ounce is 0.02957352956 base units; one Imperial fluid ounce is 0.0284130625 base units.
Important distinctions
US liquid measures and Imperial measures are different. Dry gallons and recipe cups are excluded.
Precision
The converter uses stored conversion factors and floating-point arithmetic. Results display up to ten significant digits, switching to scientific notation for very small or large values. Keep the precision of your original measurement when reporting results.
Common questions
How do I convert US fl oz to Imp fl oz?
Multiply the quantity in US fl oz by 1.040842731. You can also type the value into the converter above.
Can I reverse the conversion?
Yes. Use the swap button or open the Imperial fluid ounce to US fluid ounce converter.
Reference
NIST Guide to the SI — conversion factors and prefix conventions. SI prefixes scale units by powers of ten; the dimension-specific notes above describe the assumptions used on this page.
