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Miles per Gallon (US) to Kilometers per Gallon (US) Conversion Calculator: Free Online Tool

Convert miles per US gallon to kilometers per US gallon with our free online fuel consumption converter.

Miles per Gallon (US) to Kilometers per Gallon (US) Calculator

Miles per Gallon (US)
Kilometers per Gallon (US)

How to Use the Calculator:

  1. Enter the value you want to convert in the 'From' field (Miles per Gallon (US)).
  2. The converted value in Kilometers per Gallon (US) will appear automatically in the 'To' field.
  3. Use the dropdown menus to select different units within the Fuel Consumption category.
  4. Click the swap button (⇌) to reverse the conversion direction.

How to Convert Miles per Gallon (US) to Kilometers per Gallon (US)

Converting Miles per Gallon (US) to Kilometers per Gallon (US) involves multiplying the value by a specific conversion factor, as shown in the formula below.

Formula:

1 Miles per Gallon (US) = 0.112311 kilometers per US gallon

Example Calculation:

Convert 30 miles per US gallon: 30 × 0.112311 = 3.36933 kilometers per US gallon

Disclaimer: For Reference Only

These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.

Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.

What is a Miles per Gallon (US) and a Kilometers per Gallon (US)?

Miles per Gallon (US), often abbreviated as MPG (US) or simply MPG in the US context, is a unit of fuel efficiency used primarily within the United States customary system. It quantifies the distance in miles that a vehicle can travel using one US gallon of fuel. A higher MPG (US) value indicates better fuel efficiency.

Kilometers per Gallon (US), often abbreviated as km/gal (US), is a unit of fuel efficiency. It measures the distance in kilometers (km) that a vehicle can travel using one US liquid gallon (US gal) of fuel. It combines a metric unit of distance with a US customary unit of volume.

Note: The Miles per Gallon (US) is part of the imperial/US customary system, primarily used in the US, UK, and Canada for everyday measurements. The Kilometers per Gallon (US) belongs to the metric (SI) system.

History of the Miles per Gallon (US) and Kilometers per Gallon (US)

MPG based on the US customary gallon (approximately 3.785 liters) became the standard measure for vehicle fuel economy in the United States many decades ago. Its prominence was solidified by government regulations, particularly the Corporate Average Fuel Economy (CAFE) standards established in the 1970s and enforced by the Environmental Protection Agency (EPA). The EPA mandates MPG testing and reporting for all new vehicles sold in the US.

This unit is not a standard international or US unit for fuel consumption. Its use typically arises in specific, often informal, contexts where metric distances (kilometers) need to be related to fuel volumes measured in US gallons. This might occur when comparing vehicle specifications or fuel data between regions using different systems (e.g., comparing a European car's potential range using US fuel measurements) or during transitions between measurement systems.

Common Uses for miles per US gallon and kilometers per US gallon

Explore the typical applications for both Miles per Gallon (US) (imperial/US) and Kilometers per Gallon (US) (metric) to understand their common contexts.

Common Uses for miles per US gallon

  • Official Vehicle Ratings: The primary unit used by the EPA for reporting official city, highway, and combined fuel economy figures for new vehicles sold in the US.
  • Window Stickers (Monroney Label): Displayed prominently on the mandatory window stickers of new cars, allowing consumers to compare efficiency at the point of sale.
  • Consumer Comparison: Widely used by American consumers to compare the fuel efficiency and potential running costs of different vehicles.
  • Vehicle Advertising: Frequently highlighted in car advertisements and marketing materials within the US.
  • Informal Benchmarking: The common unit used in everyday conversation about car fuel efficiency in the US.

Common Uses for kilometers per US gallon

Kilometers per Gallon (US) is rarely used in official vehicle specifications, regulations, or everyday conversation, especially within the United States where Miles per Gallon (US MPG) is the standard. Globally, Liters per 100 kilometers (L/100km) or Kilometers per Liter (km/L) are more common metric standards. Its primary use might be in specific technical calculations, data conversions, or informal comparisons involving US fuel volumes alongside metric distances.

Frequently Asked Questions

Questions About Miles per Gallon (US) (MPG (US))

Is a higher MPG (US) value better?

Yes, a higher MPG (US) value signifies better fuel efficiency. It means the vehicle can cover more miles for each US gallon of fuel consumed.

How is MPG (US) different from MPG (UK)?

The main difference lies in the definition of the gallon. The US customary gallon (approx. 3.785 liters) is smaller than the Imperial gallon (UK, approx. 4.546 liters). Because the UK gallon is larger, a vehicle will travel further on one UK gallon than on one US gallon, resulting in a higher MPG (UK) figure compared to the MPG (US) figure for the same vehicle. Specifically, 1 MPG (UK) ≈ 1.201 MPG (US), or conversely, 1 MPG (US) ≈ 0.833 MPG (UK).

How do I convert MPG (US) to L/100km?

To convert US Miles Per Gallon to Liters per 100 kilometers (a common metric unit where lower is better), use the formula: L/100km ≈ 235.21 / MPG (US).

How do I convert MPG (US) to km/L?

To convert US Miles Per Gallon to Kilometers per Liter (a metric unit where higher is better), use the formula: km/L ≈ MPG (US) * 0.42514.

How do I convert MPG (US) to MPG (UK)?

To convert US Miles Per Gallon to Imperial Miles Per Gallon, use the formula: MPG (UK) ≈ MPG (US) * 1.20095.

About Kilometers per Gallon (US) (km/gal (US))

Why is km/gal (US) not commonly used?

The United States primarily uses Miles per Gallon (US MPG) for vehicle fuel efficiency. Most other countries using the metric system prefer Kilometers per Liter (km/L) or Liters per 100 Kilometers (L/100km). Hybrid units like km/gal (US) mix systems and are generally avoided in official standards to prevent confusion.

How does km/gal (US) differ from km/gal (UK)?

The key difference is the gallon size. The US liquid gallon is smaller than the Imperial (UK) gallon (1 US gallon ≈ 3.785 liters, while 1 UK gallon ≈ 4.546 liters). Therefore, for the same actual fuel efficiency, a vehicle's rating in km/gal (US) will be numerically higher than its rating in km/gal (UK) because it travels the same distance using a smaller gallon measure.

How do I convert km/gal (US) to km/L?

Divide the value in km/gal (US) by the exact number of liters in a US gallon: km/L = km/gal (US) / 3.785411784.

How do I convert km/gal (US) to MPG (US)?

Divide the value in km/gal (US) by the exact number of kilometers in a mile: MPG (US) = km/gal (US) / 1.609344.

How do I convert km/gal (US) to the common L/100km format?

Use the inverse relationship formula: L/100km = 378.5411784 / km/gal (US). A higher km/gal (US) value corresponds to a lower L/100km value (indicating better fuel economy).

Conversion Table: Miles per Gallon (US) to Kilometers per Gallon (US)

Miles per Gallon (US) (MPG (US))Kilometers per Gallon (US) (km/gal (US))
11.609
58.047
1016.093
2540.234
5080.467
100160.934
500804.672
1,0001,609.344

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