How many Miles/Gallon (UK)s are in 1 Miles/Gallon (US)?

There are exactly 1.2009504194 Miles/Gallon (UK)s in 1 Miles/Gallon (US). This means the conversion factor from Miles/Gallon (US) to Miles/Gallon (UK) is 1.2009504194.

What is the formula to convert Miles/Gallon (US) to Miles/Gallon (UK)?

The formula to convert Miles/Gallon (US) to Miles/Gallon (UK) is: mpg (UK) = mpg × 1.2009504194. For example, to convert 10 Miles/Gallon (US)s to Miles/Gallon (UK)s, you would multiply 10 by 1.2009504194.

What are the common uses of Miles/Gallon (US)?

The Miles/Gallon (US) is commonly used in car window stickers, fuel costs, environmental metrics.

Why is UK mpg higher than US mpg for the same car?

The imperial gallon is about 20% larger, so the car travels further per gallon on paper.

How do you convert Miles/Gallon (US) to Miles/Gallon (UK)?

To convert Miles/Gallon (US)s to Miles/Gallon (UK)s, multiply by 1.2009504194 (or divide by 0.8326738422). Therefore, 1 Miles/Gallon (US) (mpg) equals 1.20095042 Miles/Gallon (UK)s (mpg (UK)).

Miles/Gallon (US) to Miles/Gallon (UK) Converter

Worked example: converting Miles/Gallon (US) to Miles/Gallon (UK)

Step 1 — start with the formula. mpg (UK) = mpg × 1.2009504194
Step 2 — substitute your figure. 10 mpg × 1.2009504194
Step 3 — read the result. 10 mpg = 12.009504 mpg (UK)
Step 4 — check it in reverse. mpg = mpg (UK) × 0.8326738422 returns 10 mpg, which matches the figure you started with.

Fuel Economy Converter

11 units available

Decimals:

From

To

1.20095

1 mpg = 1.20095 mpg (UK)

Formula:

mpg (UK) = mpg × 1.2009504194

With your value: 1 mpg = 1.20095042 mpg (UK)

Other Miles/Gallon (US) to Miles/Gallon (UK) conversions

2 mpg to mpg (UK)3 mpg to mpg (UK)4 mpg to mpg (UK)5 mpg to mpg (UK)6 mpg to mpg (UK)7 mpg to mpg (UK)8 mpg to mpg (UK)

Miles/Gallon (US) to Miles/Gallon (UK) Conversion Table

Miles/Gallon (US) (mpg)	Miles/Gallon (UK) (mpg (UK))
0.5	0.600475
1	1.20095
2	2.401901
5	6.004752
10	12.009504
15	18.014256
20	24.019008
25	30.02376
50	60.047521
100	120.095042
250	300.237605
500	600.47521
1000	1,200.950419

Miles/Gallon (UK) to Miles/Gallon (US) Conversion Table

Miles/Gallon (UK) (mpg (UK))	Miles/Gallon (US) (mpg)
0.5	0.416337
1	0.832674
2	1.665348
5	4.163369
10	8.326738
15	12.490108
20	16.653477
25	20.816846
50	41.633692
100	83.267384
250	208.168461
500	416.336921
1000	832.673842

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.

Miles/Gallon (US) (mpg)

Fuel Economy

Exact conversion

Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

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

Miles/Gallon (UK) (mpg (UK))

Fuel Economy

Exact conversion

Composite of a defined volume and a defined length. US and imperial gallons differ, so mpg figures are not interchangeable between them.

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

Standards and context behind Miles/Gallon (US) to Miles/Gallon (UK)

Gallon mismatch: UK mpg uses the 4.54609 L imperial gallon, so the same car scores about 20% higher mpg in UK figures.

How to Convert Miles/Gallon (US) to Miles/Gallon (UK)

To convert from Miles/Gallon (US) (mpg) to Miles/Gallon (UK) (mpg (UK)), multiply the value by 1.2009504194.

Formula: mpg (UK) = mpg × 1.2009504194

Reverse: mpg = mpg (UK) × 0.8326738422

Step-by-Step Example

Start with your value in Miles/Gallon (US). For example: 5 mpg
Multiply by the conversion factor: 5 x 1.2009504194
The result is: 6.004752 mpg (UK)

Miles/Gallon (US) and Miles/Gallon (UK) Relationship

This calculation facilitates standardized conversion between recognized units of fuel economy. Since 1 Miles/Gallon (US) equals approximately 1.201 Miles/Gallon (UK)s, the Miles/Gallon (US) represents a larger unit interval than the Miles/Gallon (UK). Understanding the relationship between Miles/Gallon (US) and Miles/Gallon (UK) is essential for accurate calculations in physics, engineering, commerce, and daily applications.

About Miles/Gallon (US)

Miles per gallon (mpg) is the standard measure of fuel economy in the United States.

Common uses of Miles/Gallon (US): car window stickers, fuel costs, environmental metrics.

About Miles/Gallon (UK)

The Miles/Gallon (UK) (symbol: mpg (UK)) is a recognized unit in the Standard measurement framework, utilized within fuel economy applications for precision and standardized data representation.

Common uses of Miles/Gallon (UK): fuel economy calculations, engineering and science, education.

Frequently Asked Questions

How many Miles/Gallon (UK)s are in 1 Miles/Gallon (US)?: There are exactly 1.2009504194 Miles/Gallon (UK)s in 1 Miles/Gallon (US). This means the conversion factor from Miles/Gallon (US) to Miles/Gallon (UK) is 1.2009504194.
What is the formula to convert Miles/Gallon (US) to Miles/Gallon (UK)?: The formula to convert Miles/Gallon (US) to Miles/Gallon (UK) is: mpg (UK) = mpg × 1.2009504194. For example, to convert 10 Miles/Gallon (US)s to Miles/Gallon (UK)s, you would multiply 10 by 1.2009504194.
What is a Miles/Gallon (US)?: Miles per gallon (mpg) is the standard measure of fuel economy in the United States.
What is a Miles/Gallon (UK)?: The Miles/Gallon (UK) (symbol: mpg (UK)) is a recognized unit in the Standard measurement framework, utilized within fuel economy applications for precision and standardized data representation.
What are the common uses of Miles/Gallon (US)?: The Miles/Gallon (US) is commonly used in car window stickers, fuel costs, environmental metrics.
Why is UK mpg higher than US mpg for the same car?: The imperial gallon is about 20% larger, so the car travels further per gallon on paper.