Convert Imperial Fluid Ounce to Imperial Gallon
Convert imperial fluid ounces to imperial gallons instantly. 1 imperial fluid ounce = 0.00625 imperial gallon — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Imperial Gallon to Imperial Fluid Ounce converter for the reverse conversion.
Units explained
Imperial Fluid Ounce
An imperial fluid ounce is 1/160 of an imperial gallon (28.4131 mL).
Defined so that ten fluid ounces make an imperial half-pint.
Used in UK and Commonwealth recipes and labels.
UK, 1824.
Imperial Gallon
The imperial gallon is defined as exactly 4.54609 liters.
Set by the British Weights and Measures Act of 1824 as the volume of 10 lb of water.
Used for fuel and beverages in the UK and Commonwealth.
UK, 1824.
Imperial Fluid Ounce to Imperial Gallon conversion formula
The relationship between imperial fluid ounces and imperial gallons:
To convert imperial fluid ounces to imperial gallons, multiply the value in imperial fluid ounces by 0.00625. To reverse, multiply imperial gallons by 160.
How to use this converter
Type a value into the calculator. The result in imperial gallons updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Imperial Gallon to Imperial Fluid Ounce converter for the reverse direction.
Step-by-step: convert imperial fluid ounces to imperial gallons
- Write down the value in imperial fluid ounces (fl oz).
- Multiply that value by the factor 0.00625.
- The product is the equivalent value in imperial gallons (gal).
- To reverse, multiply the imperial gallon value by 160.
Worked examples
Example 1 — Convert 1 fl oz to gal:
1 × 0.00625 = 0.00625 gal
Example 2 — Convert 100 fl oz to gal:
100 × 0.00625 = 0.625 gal
Real-world example — Plastic film and laminate thickness
A 500-imperial fluid ounce sheet is a typical spec for ID-card laminates and film overlays. Converting to imperial gallons aligns the value with the unit most CAD systems and material datasheets prefer.
500 fl oz × 0.00625 = 3.125 gal
Real-world example — Packaging gauge
A 4-imperial fluid ounce plastic bag thickness is a common spec for grocery and freezer bags. Converting from imperial fluid ounces to imperial gallons is what packaging buyers do whenever they bridge US and metric supplier quotes.
4 fl oz × 0.00625 = 0.025 gal
Imperial Fluid Ounce to Imperial Gallon conversion table
Standard reference values for converting imperial fluid ounces to imperial gallons:
| Imperial Fluid Ounce [fl oz] | Imperial Gallon [gal] |
|---|---|
| 0.01 | 6.25e-5 |
| 0.1 | 0.000625 |
| 1 | 0.00625 |
| 2 | 0.0125 |
| 3 | 0.01875 |
| 4 | 0.025 |
| 5 | 0.03125 |
| 10 | 0.0625 |
| 20 | 0.125 |
| 30 | 0.1875 |
| 40 | 0.25 |
| 50 | 0.3125 |
| 100 | 0.625 |
| 500 | 3.125 |
| 1000 | 6.25 |
Frequently asked questions
How many imperial gallons is 1 imperial fluid ounce?
How do I convert imperial fluid ounces to imperial gallons?
How do I convert imperial gallons back to imperial fluid ounces?
How many imperial gallons is 100 imperial fluid ounces?
Popular volume unit conversions
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Metric / SI (8 units)
US Customary (Liquid) (8 units)
Imperial (UK) (3 units)
Cubic (length-derived) (3 units)
Sources & references
Conversion factor (1 fl oz = 0.00625 gal) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.