Fuel Economy Converter

Converting fuel economy units—such as kilometers per liter, liters per 100 kilometers, or miles per gallon—can be confusing due to regional differences and inverse unit formats. Whether you’re comparing vehicle efficiency across countries or calculating fuel costs for a road trip, doing these conversions manually can lead to errors. That’s why our online Fuel Economy Converter tool is built to provide instant, accurate, and convenient conversions between commonly used fuel efficiency units.

The Fuel Economy Converter is a simple yet powerful online tool designed to make vehicle mileage and efficiency comparisons effortless. Whether you’re a driver checking vehicle performance, a car buyer comparing models, or a traveler calculating gas expenses, this tool removes all complexity. Just input any fuel economy value, and it will immediately convert it across all supported units—saving time, improving accuracy, and making smarter fuel decisions easier.

Our Fuel Economy Converter supports fast and reliable conversions between the following 4 popular units:

• Kilometers per Liter (km/L)
• Liters per 100 Kilometers (L/100km)
• Miles per Gallon (U.S. mpg)
• Miles per Gallon (Imperial or U.K. mpg)

What is Fuel Economy?

Fuel economy, also known as fuel efficiency, refers to how far a vehicle can travel per unit of fuel. It is a crucial metric for understanding vehicle performance, fuel cost savings, and environmental impact. Depending on the country or manufacturer, fuel economy may be expressed in different units, including km/L, L/100km, or miles per gallon.

Unlike most units, Liters per 100 Kilometers (L/100km) is an inverse unit—lower values represent better fuel economy—while km/L and mpg follow the standard where higher is better.

Here are a few helpful conversion points:

• 1 mile per gallon (U.S.) ≈ 0.425 km/L
• 1 km/L ≈ 2.352 mpg (U.S.)
• 1 mile per gallon (Imperial) ≈ 0.354 km/L
• 1 L/100km = 100 ÷ km/L

With our Fuel Economy Converter, you no longer need to worry about conversion formulas or mismatched units. Just enter your fuel efficiency data and get instant, clear results—perfect for car owners, auto dealers, and travel planners.

What Are the Supported Units in Our Fuel Economy Converter?

Our Fuel Economy Converter helps you compare and convert vehicle efficiency across different regional and international standards. Whether you’re buying a car, calculating fuel costs, or comparing eco-friendliness, our tool ensures you get accurate conversions between all major units of fuel consumption.

Below is a detailed explanation of the supported fuel economy units available in our converter:

1. Kilometers per Liter (km/L)

Kilometers per liter measures how many kilometers a vehicle can travel using one liter of fuel. It is widely used in Asian countries like India and Japan.

2. Liters per 100 Kilometers (L/100 km)

Liters per 100 kilometers expresses the amount of fuel consumed to travel 100 km. It is the standard in Europe, Australia, and many other parts of the world. A lower value indicates better fuel efficiency.

3. Miles per Gallon (U.S.) — mpg (US)

MPG (U.S.) indicates the number of miles a car can travel per gallon of U.S. fuel. It is the standard in the United States and some Latin American countries. 1 U.S. gallon = 3.78541 liters.

4. Miles per Gallon (Imperial) — mpg (UK)

MPG (Imperial) is used in the United Kingdom and is based on the imperial gallon, which is larger than the U.S. gallon. 1 Imperial gallon = 4.54609 liters.

Fuel Economy Conversion Formulas

How to Convert Fuel Economy Units? – Explained with Examples

Fuel economy is a critical factor for vehicle performance, environmental impact, and cost-efficiency. Different countries use different measurement systems — for example, kilometers per liter (km/L), liters per 100 kilometers (L/100 km), and miles per gallon (MPG) in both U.S. and U.K. formats. Below, we explain how to convert fuel economy values using accurate formulas and real-world examples.

1. How to Convert Kilometers per Liter to Liters per 100 Kilometers?

This conversion flips the ratio: higher km/L means fewer liters used over 100 km. Formula: L/100 km = 100 ÷ km/L Example: 20 km/L → 100 ÷ 20 = 5 L/100 km

2. How to Convert Liters per 100 Kilometers to Kilometers per Liter?

This is the inverse of the previous conversion. Formula: km/L = 100 ÷ L/100 km Example: 8 L/100 km → 100 ÷ 8 = 12.5 km/L

3. How to Convert Kilometers per Liter to Miles per Gallon (U.S.)?

Use a fixed factor to convert km/L to MPG (U.S.). Formula: MPG (U.S.) = km/L × 2.35215 Example: 15 km/L × 2.35215 = 35.28 MPG (U.S.)

4. How to Convert Kilometers per Liter to Miles per Gallon (U.K.)?

Use the conversion factor for imperial gallons. Formula: MPG (U.K.) = km/L × 2.82481 Example: 15 km/L × 2.82481 = 42.37 MPG (U.K.)

5. How to Convert MPG (U.S.) to Kilometers per Liter?

Convert MPG (U.S.) back to metric. Formula: km/L = MPG (U.S.) ÷ 2.35215 Example: 30 MPG ÷ 2.35215 = 12.75 km/L

6. How to Convert MPG (U.K.) to Kilometers per Liter?

For U.K. MPG to metric, divide by the appropriate factor. Formula: km/L = MPG (U.K.) ÷ 2.82481 Example: 50 MPG ÷ 2.82481 = 17.71 km/L

7. How to Convert MPG (U.S.) to MPG (U.K.)?

Since U.K. gallons are larger than U.S. gallons, MPG (U.K.) is higher for the same km/L. Formula: MPG (U.K.) = MPG (U.S.) × 1.20095 Example: 30 MPG (U.S.) × 1.20095 = 36.03 MPG (U.K.)

How to Use the Fuel Economy Converter Tool – Step-by-Step Guide

Using the Fuel Economy Converter Tool is very simple. Here’s a step-by-step guide:

Input Boxes: There are four input boxes available, each corresponding to a different fuel efficiency unit:

• Kilometers per Liter (km/L)
• Liters per 100 Kilometers (L/100 km)
• Miles per Gallon (U.S.)
• Miles per Gallon (Imperial or U.K.)

Enter Fuel Efficiency: If you want to convert from Kilometers per Liter to other units, enter the desired value in the Kilometers per Liter input box.

Automatic Conversion: Once you enter the value, the tool instantly calculates and displays the equivalent fuel economy in the other three units.

View Results: The converted results will automatically appear in the corresponding output boxes for Liters per 100 Kilometers, Miles per Gallon (U.S.), and Miles per Gallon (Imperial), allowing you to view all conversions at once.

Frequently Asked Questions – Fuel Economy Converter

Q1: What is the most fuel-efficient unit?
That depends on region. Lower L/100 km or higher MPG/km/L values indicate better efficiency.

Q2: Which countries use L/100 km?
Most of Europe, Canada, Australia, and parts of Asia use liters per 100 kilometers (L/100 km).

Q3: What is better: 5 L/100 km or 8 L/100 km?
5 L/100 km is more fuel-efficient — it uses less fuel to cover 100 km.

Q4: Why are MPG (U.S.) and MPG (U.K.) different?
They are based on different gallon sizes:

• 1 U.S. gallon = 3.785 liters
• 1 Imperial gallon = 4.546 liters

Q5: Can I use this tool for hybrid or electric vehicles?
Not directly. Hybrids may still use these units, but electric vehicles use MPGe or kWh/100km.

Q6: Is this converter accurate?
Yes, it uses precise mathematical constants based on standard fuel economy conversions.

Q7: Does this tool work on mobile devices?
Yes, the converter is fully mobile responsive.

Q8: Is a higher km/L always better?
Yes — it means the vehicle can travel more kilometers using less fuel.

Q9: Can I convert L/100 km to MPG (U.S.)?
Yes. Convert L/100 km to km/L first, then to MPG using:
MPG (U.S.) = (100 ÷ L/100km) × 2.35215

Q10: Do U.S. car ads use MPG or L/100 km?
The U.S. uses MPG (U.S.) in advertising and vehicle ratings.

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Conclusion: Understanding and converting power units is essential in fields like electrical engineering, thermodynamics, and HVAC. Our Power Converter supports a wide variety of units including watt, kilowatt, megawatt, gigawatt, horsepower, metric horsepower, erg per second, calorie per second, BTU per hour, foot-pound per minute, and ton of refrigeration. Whether you’re calculating power output for engines, electrical devices, or heating systems, this tool offers quick, accurate, and hassle-free conversions. Try it now to streamline your power-related calculations.

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