How do you convert mpg to km/l?

To convert mpg (MPG (US)) to km/l (km/L), apply the conversion formula: km/L = MPG (US) × 0.42514. For example, 30 MPG (US) converts to 12.75431 km/L.

What is 30 mpg in km/l?

30 mpg (30 MPG (US)) is equal to 12.75431 km/l (12.75431 km/L).

Which is larger, 1 miles per gallon (us) (MPG (US)) or 1 kilometers per liter (km/L)?

At an input of 1 MPG (US), the equivalent value is 0.42514 km/L, whereas 1 km/L equals 2.35215 MPG (US). 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 km/l (km/L) to mpg (us) (MPG (US))?

Use the Swap button in the calculator above to switch km/L and MPG (US) immediately. For reference, 1 km/L equals 2.35215 MPG (US).

Are there regional or standard differences when converting MPG (US) and km/L?

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 km/L Converter

Enter the fuel economy in mpg below to convert it to km/l.

km/L to MPG (US) (km/L → MPG (US))

Convert MPG (US) to km/L

Enter a value in mpg (us) (MPG (US)) to convert to km/l (km/L).

Value (MPG (US))

From

Result

•

12.754311km/l

30 MPG (US) = 12.754311 km/L

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 Kilometers per Liter Conversion Table

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

MPG (US) (MPG (US))	km/L (km/L)
1 MPG (US)	0.4251437 km/L
2 MPG (US)	0.8502874 km/L
5 MPG (US)	2.1257185 km/L
6 MPG (US)	2.5508622 km/L
7 MPG (US)	2.9760059 km/L
8 MPG (US)	3.4011496 km/L
10 MPG (US)	4.251437 km/L
12 MPG (US)	5.1017244 km/L
15 MPG (US)	6.3771555 km/L
20 MPG (US)	8.502874 km/L

How to Convert MPG to km/L

To convert mpg (MPG (US)) to km/l (km/L), apply the governing fuel efficiency relationship: km/L = MPG (US) × 0.42514.

Use this formula to convert between mpg and km/l:

km/L = MPG (US) × 0.42514

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 30 MPG (US) to km/l using the formula above:

km/l = 30 × 0.4251437 = 12.75431 = 12.754311 km/L

How Many km/L Are in a Miles per Gallon?

There are 0.4251437 km/l in a miles per gallon, which is why we use this value in the formula above.

1 MPG (US) = 0.4251437 km/L|1 km/L = 2.3521458 MPG (US)

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

MPG and km/l 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 US liquid 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 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.

What Is a Kilometers per Liter?

Kilometers traveled per liter of fuel. It serves as a primary reference unit for measuring fuel economy across scientific and practical applications. [2]

The kilometers per liter is classified as a metric and SI-compatible unit of fuel economy. km/L can be abbreviated as km/L; for example, 1 kilometers per liter can be written as 1 km/L.

In the metric system, "kilo" is the standard SI prefix for thousands, or 10³. This makes the kilometers per liter (km/L) a convenient decimal multiple of the miles per gallon (MPG (US)).

In practice, km/l (km/L) are widely used across standard fuel economy applications within SI metric workflows, engineering documentation, and technical data sheets.

Learn more about km/l in our Fuel Economy Converter.

When converting fuel economy between mpg (MPG (US)) and km/l (km/L), keep full floating-point precision (1 MPG (US) = 0.4251437 km/L; 1 km/L = 2.3521458 MPG (US)) during intermediate calculations and round only the final kilometers per liter figure to match your instrument tolerance.

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

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

Convert from Miles per Gallon (US)

Convert to km/L

Frequently Asked Questions

There are 0.42514 km/l (km/L) in 1 miles per gallon (MPG (US)). Conversely, 1 kilometers per liter (km/L) is equal to 2.35215 mpg (MPG (US)).

Fuel Economy Converter

Quick Info

Direct Factor: 1 miles per gallon (us) (MPG (US)) equals 0.42514 km/l (km/L).
Inverse Factor: 1 kilometers per liter (km/L) equals 2.35215 mpg (us) (MPG (US)).
Formula: km/L = MPG (US) × 0.42514.
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 (US) (MPG (US))

Miles traveled per US liquid gallon.

Kilometers per Liter (km/L)

Kilometers traveled per liter of fuel.

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

Miles traveled per UK Imperial gallon.

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 (US) (MPG (US)) to km/L (km/L)
DOE / EPA Standard
[2]
NIST SP 811 (NIST SP 811 App. B.9 (Fuel Consumption))·Unit Specifications: Miles per Gallon (US) (MPG (US)) & Kilometers per Liter (km/L)
NIST SP 811 Specification
[3]
NIST OWM (SI Units — Volume (US vs. Imperial Gallon))·Conversion Factors & Mathematical Basis (MPG (US) to km/L)
NIST OWM Reference

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