Gallon (US) to Fluid Ounce (UK) Converter

Volume Converter

40 units available

Decimals:

From

To

133.22787

1 gal = 133.22787 fl oz (UK)

Formula:

fl oz (UK) = gal × 133.2278695406

With your value: 1 gal = 133.22786954 fl oz (UK)

How big is that?

Everyday references on a logarithmic scale, all expressed in gallon (us) so you can sanity-check the result.

Milk carton (1/3.8e+3 your value)0.000264 gal

Kitchen bucket (1/3.8e+2 your value)0.00264 gal

Car fuel tank (1/76 your value)0.0132 gal

Bathtub (1/19 your value)0.0528 gal

Hot tub (1/2.5 your value)0.396 gal

Your value1.00 gal

Other Gallon (US) to Fluid Ounce (UK) conversions

2 gal to fl oz (UK)3 gal to fl oz (UK)4 gal to fl oz (UK)5 gal to fl oz (UK)6 gal to fl oz (UK)7 gal to fl oz (UK)8 gal to fl oz (UK)

Gallon (US) to Fluid Ounce (UK) Conversion Table

Gallon (US) (gal)	Fluid Ounce (UK) (fl oz (UK))
0.5	66.613935
1	133.22787
2	266.455739
5	666.139348
10	1,332.278695
15	1,998.418043
20	2,664.557391
25	3,330.696739
50	6,661.393477
100	13,322.786954
250	33,306.967385
500	66,613.93477
1000	133,227.869541

Fluid Ounce (UK) to Gallon (US) Conversion Table

Fluid Ounce (UK) (fl oz (UK))	Gallon (US) (gal)
0.5	0.003753
1	0.007506
2	0.015012
5	0.03753
10	0.075059
15	0.112589
20	0.150119
25	0.187648
50	0.375297
100	0.750594
250	1.876484
500	3.752969
1000	7.505937

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Gallon (US) (gal)

Volume

Exact conversion

The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Fluid Ounce (UK) (fl oz (UK))

Volume

Exact conversion

Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Gallon (US) to Fluid Ounce (UK)

To convert from Gallon (US) (gal) to Fluid Ounce (UK) (fl oz (UK)), multiply the value by 133.2278695406.

Formula: fl oz (UK) = gal × 133.2278695406

Reverse: gal = fl oz (UK) × 0.007505937

Step-by-Step Example

Start with your value in Gallon (US). For example: 5 gal
Multiply by the conversion factor: 5 x 133.2278695406
The result is: 666.139348 fl oz (UK)

About Gallon (US)

The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.

Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.

Common uses: fuel (US), beverages, swimming pools.

About Fluid Ounce (UK)

The fluid ounce (uk) (fl oz (UK)) is a unit of volume and capacity. One fluid ounce (uk) equals 0.0284130625 litres. UnitConvertLab converts it against every other volume unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: volume calculations, engineering and science, education.

Frequently Asked Questions

How many Fluid Ounce (UK) are in 1 Gallon (US)?

There are exactly 133.2278695406 Fluid Ounce (UK) in 1 Gallon (US). This means the conversion factor from Gallon (US) to Fluid Ounce (UK) is 133.2278695406.

What is the formula to convert Gallon (US) to Fluid Ounce (UK)?

The formula to convert Gallon (US) to Fluid Ounce (UK) is: fl oz (UK) = gal × 133.2278695406. For example, to convert 10 Gallon (US) to Fluid Ounce (UK), you would multiply 10 by 133.2278695406.

What is a Gallon (US)?