Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
US fluid ounces to US gallons
Convert fl oz to US gal instantly, then review the formula, assumptions, and rounding guidance.
VolumeInstant result
Decimals
Formula result = input × 0.0295735296 ÷ 3.785411784. 1 fl oz = 0.0078 US 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 | US gal |
|---|---|
| 1 fl oz | 0.0078 US gal |
| 2 fl oz | 0.0156 US gal |
| 5 fl oz | 0.0391 US gal |
| 10 fl oz | 0.0781 US gal |
| 25 fl oz | 0.1953 US gal |
| 50 fl oz | 0.3906 US gal |
| 100 fl oz | 0.7813 US gal |
Conversion chart
1 fl oz0.0078 US gal
5 fl oz0.0391 US gal
10 fl oz0.0781 US gal
25 fl oz0.1953 US gal
50 fl oz0.3906 US 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 US gal and apply your display precision.
Understand the result before using it
US fluid ounces to US gallons converts a value measured in US fluid ounces (fl oz) into the equivalent value in US gallons (US 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 ÷ 3.785411784
Assumptions
- US fluid ounces and US gallons represent the same volume quantity.
- The input is expressed in fl oz; the output is expressed in US gal.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 fl oz = 0.00781250000991 US 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 US gal.
- Compare a us fluid ounces value with a value reported in us gallons.
- Check the fl oz-to-US 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 US gallons?
result = input × 0.0295735296 ÷ 3.785411784 Using the displayed relationship, 1 fl oz equals 0.00781250000991 US gal.
How many US gallons are in one US fluid ounces?
One US fluid ounces is 0.00781250000991 US gallons. The displayed digits may be rounded.
Can I reverse the fl oz to US gal conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts US gal back to fl oz.
Is the US fluid ounces to US 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.