How do you convert mpg to mpg?

To convert mpg (MPG (UK)) to mpg (MPG (US)), apply the conversion formula: MPG (US) = MPG (UK) / 1.20095. For example, 45 MPG (UK) converts to 37.47034 MPG (US).

What is 45 mpg in mpg?

45 mpg (45 MPG (UK)) is equal to 37.47034 mpg (37.47034 MPG (US)).

Which is larger, 1 miles per gallon (uk) (MPG (UK)) or 1 miles per gallon (us) (MPG (US))?

At an input of 1 MPG (UK), the equivalent value is 0.83267 MPG (US), whereas 1 MPG (US) equals 1.20095 MPG (UK). Because fuel economy scales use offset or reciprocal relationships, always check the specific operating range in the conversion table above.

How do I convert back from mpg (us) (MPG (US)) to mpg (uk) (MPG (UK))?

Use the Swap button in the calculator above to switch MPG (US) and MPG (UK) immediately. For reference, 1 MPG (US) equals 1.20095 MPG (UK).

Are there regional or standard differences when converting MPG (UK) and MPG (US)?

US vs. UK MPG and Inverse Consumption Scales: Miles per gallon (MPG) measures distance traveled per unit of fuel (higher is better), whereas Liters per 100 km (L/100km) measures fuel volume consumed over a fixed distance (lower is better). Because the UK Imperial gallon (4.54609 L) is ~20.1% larger than the US gallon (3.78541 L), US MPG uses the conversion constant 235.215 while UK MPG uses 282.481.

MPG to MPG Converter

Enter the fuel economy in mpg below to convert it to mpg.

MPG (US) to MPG (UK) (MPG (US) → MPG (UK))

Convert MPG (UK) to MPG (US)

Enter a value in mpg (uk) (MPG (UK)) to convert to mpg (us) (MPG (US)).

Value (MPG (UK))

From

Result

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37.470339104mpg (us)

45 MPG (UK) = 37.470339104 MPG (US)

Result updates automatically

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Suggested Conversions

Reference:DOE / EPA (EPA 40 CFR Part 600 Fuel Economy)

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Miles per Gallon to Miles per Gallon Conversion Table

Table showing various miles per gallon measurements converted to mpg. Click any preset value or arrow to load it into the converter.

MPG (UK) (MPG (UK))	MPG (US) (MPG (US))
1 MPG (UK)	0.8326742 MPG (US)
2 MPG (UK)	1.6653484 MPG (US)
5 MPG (UK)	4.163371 MPG (US)
6 MPG (UK)	4.9960452 MPG (US)
7 MPG (UK)	5.8287194 MPG (US)
8 MPG (UK)	6.6613936 MPG (US)
10 MPG (UK)	8.326742 MPG (US)
12 MPG (UK)	9.9920904 MPG (US)
15 MPG (UK)	12.490113 MPG (US)
20 MPG (UK)	16.653484 MPG (US)

How to Convert MPG to MPG

To convert mpg (MPG (UK)) to mpg (MPG (US)), apply the governing fuel efficiency relationship: MPG (US) = MPG (UK) / 1.20095.

Use this formula to convert between mpg and mpg:

MPG (US) = MPG (UK) / 1.20095

Fuel consumption and distance-per-volume efficiency scales are related by exact international volume and mile/kilometer constants.

For example, here's how to convert 45 MPG (UK) to mpg using the formula above:

mpg = 45 ÷ 1.2009499 = 37.47034 = 37.4703391 MPG (US)

How Many MPG Are in a Miles per Gallon?

There are 0.8326742 mpg in a miles per gallon, which is why we use this value in the formula above.

1 MPG (UK) = 0.8326742 MPG (US)|1 MPG (US) = 1.2009499 MPG (UK)

Our miles per gallon to miles per gallon calculator automatically converts your fuel economy measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

MPG and mpg are both units used to measure fuel economy. Keep reading to learn more about each unit.

What Is a Miles per Gallon?

Miles traveled per UK Imperial gallon. It serves as a primary reference unit for measuring fuel economy across scientific and practical applications. [1]

The miles per gallon is classified as a US customary and imperial unit of fuel economy. MPG can be abbreviated as MPG (UK); for example, 1 miles per gallon can be written as 1 MPG (UK).

When working with mpg (MPG (UK)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, mpg (MPG (UK)) are widely used across standard fuel economy applications within US customary and imperial workflows, engineering documentation, and technical data sheets.

Learn more about mpg in our Fuel Economy Converter.

What Is a Miles per Gallon?

Miles traveled per US liquid gallon. It serves as a primary reference unit for measuring fuel economy across scientific and practical applications. [2]

The miles per gallon is classified as a US customary unit of fuel economy. MPG can be abbreviated as MPG (US); for example, 1 miles per gallon can be written as 1 MPG (US).

As the primary coherent reference unit for fuel economy in this category, all other fuel economy units are mathematically anchored to the miles per gallon (MPG (US)).

In practice, mpg (MPG (US)) are widely used across standard fuel economy applications within US customary workflows, engineering documentation, and technical data sheets.

Learn more about mpg in our Fuel Economy Converter.

When converting fuel economy between mpg (MPG (UK)) and mpg (MPG (US)), keep full floating-point precision (1 MPG (UK) = 0.8326742 MPG (US); 1 MPG (US) = 1.2009499 MPG (UK)) during intermediate calculations and round only the final miles per gallon figure to match your instrument tolerance.

More Miles per Gallon & Miles per Gallon (US) Conversions

Need to calculate in the opposite direction? Use our mpg (us) to mpg (uk) converter (MPG (US) to MPG (UK)) to switch your starting unit immediately. You can also explore related tools such as converting l/100km to mpg (us), converting km/l to mpg (us), or converting mpg (uk) to l/100km.

Convert from MPG

Convert to Miles per Gallon (US)

Frequently Asked Questions

There are 0.83267 mpg (MPG (US)) in 1 miles per gallon (MPG (UK)). Conversely, 1 miles per gallon (MPG (US)) is equal to 1.20095 mpg (MPG (UK)).

Fuel Economy Converter

Quick Info

Direct Factor: 1 miles per gallon (uk) (MPG (UK)) equals 0.83267 mpg (us) (MPG (US)).
Inverse Factor: 1 miles per gallon (us) (MPG (US)) equals 1.20095 mpg (uk) (MPG (UK)).
Formula: MPG (US) = MPG (UK) / 1.20095.
Standard Note: US vs. UK MPG and Inverse Consumption Scales: Miles per gallon (MPG) measures distance traveled per unit of fuel (higher is better), whereas Liters per 100 km (L/100km) measures fuel volume consumed over a fixed distance (lower is better). Because the UK Imperial gallon (4.54609 L) is ~20.1% larger than the US gallon (3.78541 L), US MPG uses the conversion constant 235.215 while UK MPG uses 282.481.

Units Comparison

Miles per Gallon (UK) (MPG (UK))

Miles traveled per UK Imperial gallon.

Miles per Gallon (US) (MPG (US))

Miles traveled per US liquid gallon.

Kilometers per Liter (km/L)

Kilometers traveled per liter of fuel.

References

[1]DOE / EPA · EPA 40 CFR Part 600 Fuel Economy
Source
[2]NIST SP 811 · NIST SP 811 App. B.9 (Fuel Consumption)
Source
[3]NIST OWM · SI Units — Volume (US vs. Imperial Gallon)
Source

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References

NIST · BIPM · ISO

[1]
DOE / EPA (EPA 40 CFR Part 600 Fuel Economy)·Fuel Economy Metrology Standard — MPG (UK) (MPG (UK)) to MPG (US) (MPG (US))
DOE / EPA Standard
[2]
NIST SP 811 (NIST SP 811 App. B.9 (Fuel Consumption))·Unit Specifications: Miles per Gallon (UK) (MPG (UK)) & Miles per Gallon (US) (MPG (US))
NIST SP 811 Specification
[3]
NIST OWM (SI Units — Volume (US vs. Imperial Gallon))·Conversion Factors & Mathematical Basis (MPG (UK) to MPG (US))
NIST OWM Reference

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