Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
US fluid ounces to Imperial gallons
Convert fl oz to imp gal instantly, then review the formula, assumptions, and rounding guidance.
VolumeInstant result
Decimals
Formula result = input × 0.0295735296 ÷ 4.54609. 1 fl oz = 0.0065 imp gal
Common examples
One value, several units
Litres0.0296 L
Millilitres29.5735 mL
Cubic metres0 m³
Cubic centimetres29.5735 cm³
US gallons0.0078 US gal
Imperial gallons0.0065 imp gal
US quarts0.0313 qt
US cups0.125 cup
Conversion table
| fl oz | imp gal |
|---|---|
| 1 fl oz | 0.0065 imp gal |
| 2 fl oz | 0.013 imp gal |
| 5 fl oz | 0.0325 imp gal |
| 10 fl oz | 0.0651 imp gal |
| 25 fl oz | 0.1626 imp gal |
| 50 fl oz | 0.3253 imp gal |
| 100 fl oz | 0.6505 imp gal |
Conversion chart
1 fl oz0.0065 imp gal
5 fl oz0.0325 imp gal
10 fl oz0.0651 imp gal
25 fl oz0.1626 imp gal
50 fl oz0.3253 imp gal
Worked example
1 litre equals 1,000 millilitres.
Unit definition
US fluid ounces (fl oz) One us fluid ounces equals 0.0295735296 litre.
Unit history
US fluid ounces is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert fl oz to litre.
3. Convert the base value to imp gal and apply your display precision.
Understand the result before using it
US fluid ounces to Imperial gallons converts a value measured in US fluid ounces (fl oz) into the equivalent value in Imperial gallons (imp gal). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 0.0295735296 ÷ 4.54609
Assumptions
- US fluid ounces and Imperial gallons represent the same volume quantity.
- The input is expressed in fl oz; the output is expressed in imp gal.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 fl oz = 0.00650526707566 imp gal. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a fl oz measurement in a document that expects imp gal.
- Compare a us fluid ounces value with a value reported in imperial gallons.
- Check the fl oz-to-imp gal arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- US gallons and imperial gallons are different units; select the one your source actually uses.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert US fluid ounces to Imperial gallons?
result = input × 0.0295735296 ÷ 4.54609 Using the displayed relationship, 1 fl oz equals 0.00650526707566 imp gal.
How many Imperial gallons are in one US fluid ounces?
One US fluid ounces is 0.00650526707566 Imperial gallons. The displayed digits may be rounded.
Can I reverse the fl oz to imp gal conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts imp gal back to fl oz.
Is the US fluid ounces to Imperial gallons result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.