Convert US gallons to Fluid Ounce (UK)
Western Europe · Cooking Measures · active · modern
Conventional value The unit is customary but its modern value is settled and widely cited; the arithmetic itself is exact.
Quick answer
1 US gallon = 133.228 Fluid Ounce (UK)
1 US gallon = 133.228 Fluid Ounce (UK). Fluid Ounce (UK) is a traditional volume unit from Western Europe.
Convert any amount
US gallons to Fluid Ounce (UK) table
| US gallons | Fluid Ounce (UK) |
|---|---|
| 0.25 US gallons | 33.3069 Fluid Ounce (UK) |
| 0.5 US gallons | 66.6138 Fluid Ounce (UK) |
| 1 US gallon | 133.228 Fluid Ounce (UK) |
| 2 US gallons | 266.455 Fluid Ounce (UK) |
| 3 US gallons | 399.683 Fluid Ounce (UK) |
| 4 US gallons | 532.911 Fluid Ounce (UK) |
| 5 US gallons | 666.138 Fluid Ounce (UK) |
| 10 US gallons | 1,332.28 Fluid Ounce (UK) |
| 20 US gallons | 2,664.55 Fluid Ounce (UK) |
| 25 US gallons | 3,330.69 Fluid Ounce (UK) |
| 50 US gallons | 6,661.38 Fluid Ounce (UK) |
| 100 US gallons | 13,322.8 Fluid Ounce (UK) |
About the Fluid Ounce (UK)
UK fl oz = 28.41ml. Slightly smaller than US.
- Symbol
- fl oz UK
- Value in SI
- 1 Fluid Ounce (UK) = 0.0284131 litre
- Typical use
- cooking
- Source
- UnitConvertLab measurement atlas
Every atlas conversion routes through the SI litre. See our methodology and data provenance pages for how these values are sourced and verified.
Frequently asked
How many Fluid Ounce (UK) are in a US gallon?
1 US gallon = 133.228 Fluid Ounce (UK). Multiply the number of US gallons by 133.22769 to get Fluid Ounce (UK).
What is Fluid Ounce (UK) used for?
UK fl oz = 28.41ml. Slightly smaller than US. It is classified as active and dates from the modern period.
Is the Fluid Ounce (UK) value exact?
Yes for practical purposes. UnitConvertLab converts every atlas unit through the SI litre, so the arithmetic itself introduces no rounding beyond the digits shown.
How reliable is this Fluid Ounce (UK) conversion?
Conventional value — The unit is customary but its modern value is settled and widely cited; the arithmetic itself is exact. Source: UnitConvertLab measurement atlas.
Cite this page
UnitConvertLab. (2026). Convert US gallons to Fluid Ounce (UK). UnitConvertLab. Retrieved from https://unitconvertlab.com/regional/us-gallon-to-fl-oz-uk
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