How many US fluid ounces are in a UK gallon?

One UK (imperial) gallon equals approximately 160.9407 US fluid ounces. This differs from the UK fluid ounce because the US fluid ounce (29.5735 mL) is slightly larger than the UK fluid ounce (28.4131 mL).

How many UK fluid ounces are in a UK gallon?

Exactly 160 UK fluid ounces. This is the exact imperial definition: 1 UK gallon = 8 pints = 160 fluid ounces.

What is the difference between a UK gallon and a US gallon?

A UK (imperial) gallon is about 4.546 liters, while a US gallon is about 3.785 liters. The UK gallon is roughly 20% larger than the US gallon.

Why are there two fluid ounce results?

The US fluid ounce and the UK fluid ounce are different units. The US fl oz is 29.5735 mL and the UK fl oz is 28.4131 mL. Recipes and labels in the US use US fl oz, while UK labels use UK fl oz, so both are shown.

Is this converter accurate enough for cooking?

Yes. The conversion factors used (1 UK gal = 160.9407 US fl oz, 1 UK gal = 160 UK fl oz) are precise to six significant figures, which is more than adequate for cooking or any practical use.

UK Gallons to Fluid Ounces Converter

Name: UK Gallons to Fluid Ounces Converter
Availability: InStock
Author: Nham Vu

Enter UK (imperial) gallons and instantly see the equivalent in both US and UK fluid ounces.

UK Gallons

Enter a value in imperial gallons

US Fluid Ounces

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1 UK gal = 160.9407 US fl oz

UK Fluid Ounces

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1 UK gal = 160 UK fl oz (exact)

Note: The US fluid ounce (29.5735 mL) differs from the UK fluid ounce (28.4131 mL). Always confirm which fluid ounce standard applies to your context.

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Summary

Enter UK (imperial) gallons and instantly see the equivalent in both US and UK fluid ounces.

How it works

Enter a value in UK (imperial) gallons.
The tool multiplies by 160.9407 to get US fluid ounces.
It also multiplies by 160 to get UK fluid ounces (the exact imperial definition).
Results update instantly as you type.
Use the swap button to convert in the reverse direction.

Use cases

Convert recipe volumes between imperial and US measurements.
Calculate fuel or fluid quantities for imported UK vehicles.
Double-check industrial or laboratory unit conversions.
Compare UK vs US fluid ounce differences for purchasing decisions.
Convert home-brewing volumes between measurement systems.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu