Volume conversion
US fluid ounce to Imperial fluid ounce converter
Convert fl oz to imp fl oz instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Imperial fluid ounce (imp fl oz)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Calculation
US fluid ounce to Imperial fluid ounce formula
imp fl oz = fl oz × 1.040843
Calculations retain full precision and the result is rounded only for display.
Worked example
For 10 fl oz, the result is 10.408427 imp fl oz. Substitute 10 fl oz into the formula to obtain 10.408427 imp fl oz.
A numerical value expressed in imperial fluid ounce is usually larger than the same measurement expressed in us fluid ounce, because 1 fl oz equals 1.040843 imp fl oz.
US fluid ounce to Imperial fluid ounce reference table
Common values rounded to a maximum of 6 decimal places.
| US fluid ounce (fl oz) | Imperial fluid ounce (imp fl oz) |
|---|---|
| 1 fl oz | 1.040843 imp fl oz |
| 5 fl oz | 5.204214 imp fl oz |
| 10 fl oz | 10.408427 imp fl oz |
| 50 fl oz | 52.042137 imp fl oz |
| 100 fl oz | 104.084273 imp fl oz |
Understanding the units
About US fluid ounce and Imperial fluid ounce
US fluid ounce (fl oz)
One us fluid ounce (fl oz) equals 0.02957353 L, the base relationship used for this volume conversion.
Imperial fluid ounce (imp fl oz)
One imperial fluid ounce (imp fl oz) equals 0.028413063 L, the base relationship used for this volume conversion.
When this conversion is useful
US fluid ounce to Imperial fluid ounce conversion is useful for recipes, beverage quantities, fuel volumes, laboratory measurements, and container capacities. It lets you compare the same volume or capacity across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Metric vs Imperial Units: A Practical Comparison
Understand how metric, US customary, and Imperial units differ, where each system is used, and how to convert between them reliably.
Read guide →Everyday conversionsUS Gallons vs Imperial Gallons: What Is the Difference?
Compare US liquid gallons and Imperial gallons, understand their exact liter values, and avoid common fuel and recipe conversion errors.
Read guide →Answers at a glance
Frequently asked questions
How do you convert US fluid ounce to Imperial fluid ounce?
Use the formula imp fl oz = fl oz × 1.040843. Enter any value in the converter above to calculate the result instantly.
How many imperial fluid ounce are in one us fluid ounce?
One us fluid ounce equals 1.040843 imperial fluid ounce.
How does Convr round US fluid ounce to Imperial fluid ounce results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal us fluid ounce values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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