Fluid Ounce (US) to Fluid Ounce (UK) Converter

Volume Converter

40 units available

Decimals:

From

To

1.040843

1 fl oz = 1.040843 fl oz (UK)

Formula:

fl oz (UK) = fl oz × 1.0408427308

With your value: 1 fl oz = 1.04084273 fl oz (UK)

How big is that?

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

Milk carton (1/30 your value)0.0338 fl oz

Kitchen bucket (1/3.0 your value)0.338 fl oz

Your value1.00 fl oz

Car fuel tank (1.7× your value)1.69 fl oz

Bathtub (6.8× your value)6.76 fl oz

Hot tub (51× your value)50.7 fl oz

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

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

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

Fluid Ounce (US) (fl oz)	Fluid Ounce (UK) (fl oz (UK))
0.5	0.520421
1	1.040843
2	2.081685
5	5.204214
10	10.408427
15	15.612641
20	20.816855
25	26.021068
50	52.042137
100	104.084273
250	260.210683
500	520.421365
1000	1,040.842731

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

Fluid Ounce (UK) (fl oz (UK))	Fluid Ounce (US) (fl oz)
0.5	0.48038
1	0.96076
2	1.92152
5	4.8038
10	9.607599
15	14.411399
20	19.215199
25	24.018999
50	48.037997
100	96.075994
250	240.189985
500	480.37997
1000	960.75994

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.

Fluid Ounce (US) (fl oz)

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

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 Fluid Ounce (US) to Fluid Ounce (UK)

To convert from Fluid Ounce (US) (fl oz) to Fluid Ounce (UK) (fl oz (UK)), multiply the value by 1.0408427308.

Formula: fl oz (UK) = fl oz × 1.0408427308

Reverse: fl oz = fl oz (UK) × 0.9607599404

Step-by-Step Example

Start with your value in Fluid Ounce (US). For example: 5 fl oz
Multiply by the conversion factor: 5 x 1.0408427308
The result is: 5.204214 fl oz (UK)

About Fluid Ounce (US)

The US fluid ounce equals approximately 29.57 mL. It is commonly used for beverage and liquid measurements.

Common uses: beverages, cooking, cocktails.

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 Fluid Ounce (US)?

There are exactly 1.0408427308 Fluid Ounce (UK) in 1 Fluid Ounce (US). This means the conversion factor from Fluid Ounce (US) to Fluid Ounce (UK) is 1.0408427308.

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

The formula to convert Fluid Ounce (US) to Fluid Ounce (UK) is: fl oz (UK) = fl oz × 1.0408427308. For example, to convert 10 Fluid Ounce (US) to Fluid Ounce (UK), you would multiply 10 by 1.0408427308.

What is a Fluid Ounce (US)?