Conversions

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Fuel Economy Converter Converter.

Convert fuel economy converter with explicit unit, density, concentration, or reference inputs.

On-device calculationNo signup

Set your values

Results update as you type.

02 / ANSWER

Fuel-economy value

From

Fuel economy (l-per-100km)

0.000000000000

US and Imperial gallons differ. Select both conventions explicitly; no regional unit is inferred from the word mpg.

FAQs

How does the fuel economy converter converter work?

Convert fuel economy converter with explicit unit, density, concentration, or reference inputs.

Use Cases

Compare fuel economy across countries

When buying a car or reading reviews, you may encounter different units. This converter helps you compare efficiency regardless of the original unit.

Example: A car rated 5.5 L/100km is about 42.8 US mpg or 51.4 Imperial mpg.

Understand your vehicle's efficiency

If your car's manual lists fuel economy in one unit but you're used to another, convert it to a familiar unit to better gauge performance.

Example: Convert 25 US mpg to see it equals 9.4 L/100km.

Frequently Asked Questions

How do I convert US mpg to liters per 100 km?: To convert US mpg to L/100km, divide 235.215 by the mpg value. For example, 30 US mpg equals about 7.84 L/100km. This calculator does the math for you.
What is the difference between US mpg and Imperial mpg?: US mpg uses the US gallon (3.785 liters), while Imperial mpg uses the UK gallon (4.546 liters). Since the gallons differ, the same car will show different mpg values depending on which system you use.
Why do European cars use L/100km instead of mpg?: L/100km is common in Europe and many other countries. It measures how many liters of fuel are needed to travel 100 kilometers. Lower values mean better fuel economy, unlike mpg where higher is better.

Tips & Common Mistakes

Tips

Remember: lower L/100km is better, while higher mpg is better.
US and Imperial gallons differ, so always check which mpg you're using.
For quick estimates, 235.215 divided by US mpg gives L/100km.
Use this converter for reference; actual fuel economy varies with driving conditions.

Common Mistakes to Avoid

Confusing US mpg with Imperial mpg – they are not the same.
Assuming L/100km and mpg are directly proportional – they are inversely related.
Forgetting to specify the gallon type when quoting mpg values.

Last updated: August 13, 2026

Use Cases

Compare fuel economy across countries

When buying a car or reading reviews, you may encounter different units. This converter helps you compare efficiency regardless of the original unit.

Example: A car rated 5.5 L/100km is about 42.8 US mpg or 51.4 Imperial mpg.

Understand your vehicle's efficiency

If your car's manual lists fuel economy in one unit but you're used to another, convert it to a familiar unit to better gauge performance.

Example: Convert 25 US mpg to see it equals 9.4 L/100km.

Frequently Asked Questions

How do I convert US mpg to liters per 100 km?

To convert US mpg to L/100km, divide 235.215 by the mpg value. For example, 30 US mpg equals about 7.84 L/100km. This calculator does the math for you.

What is the difference between US mpg and Imperial mpg?

US mpg uses the US gallon (3.785 liters), while Imperial mpg uses the UK gallon (4.546 liters). Since the gallons differ, the same car will show different mpg values depending on which system you use.

Why do European cars use L/100km instead of mpg?

L/100km is common in Europe and many other countries. It measures how many liters of fuel are needed to travel 100 kilometers. Lower values mean better fuel economy, unlike mpg where higher is better.

Tips & Common Mistakes

Tips

Remember: lower L/100km is better, while higher mpg is better.
US and Imperial gallons differ, so always check which mpg you're using.
For quick estimates, 235.215 divided by US mpg gives L/100km.
Use this converter for reference; actual fuel economy varies with driving conditions.

Common Mistakes to Avoid

Confusing US mpg with Imperial mpg – they are not the same.
Assuming L/100km and mpg are directly proportional – they are inversely related.
Forgetting to specify the gallon type when quoting mpg values.

Conversions

Instant, private, and free

Fuel Economy Converter Converter.

Convert fuel economy converter with explicit unit, density, concentration, or reference inputs.

On-device calculationNo signup

Set your values

Results update as you type.

02 / ANSWER

Fuel-economy value

From

Fuel economy (l-per-100km)

0.000000000000

US and Imperial gallons differ. Select both conventions explicitly; no regional unit is inferred from the word mpg.

FAQs

How does the fuel economy converter converter work?

Convert fuel economy converter with explicit unit, density, concentration, or reference inputs.

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Use Cases

Compare fuel economy across countries

When buying a car or reading reviews, you may encounter different units. This converter helps you compare efficiency regardless of the original unit.

Example: A car rated 5.5 L/100km is about 42.8 US mpg or 51.4 Imperial mpg.

Understand your vehicle's efficiency

If your car's manual lists fuel economy in one unit but you're used to another, convert it to a familiar unit to better gauge performance.

Example: Convert 25 US mpg to see it equals 9.4 L/100km.

Frequently Asked Questions

How do I convert US mpg to liters per 100 km?: To convert US mpg to L/100km, divide 235.215 by the mpg value. For example, 30 US mpg equals about 7.84 L/100km. This calculator does the math for you.
What is the difference between US mpg and Imperial mpg?: US mpg uses the US gallon (3.785 liters), while Imperial mpg uses the UK gallon (4.546 liters). Since the gallons differ, the same car will show different mpg values depending on which system you use.
Why do European cars use L/100km instead of mpg?: L/100km is common in Europe and many other countries. It measures how many liters of fuel are needed to travel 100 kilometers. Lower values mean better fuel economy, unlike mpg where higher is better.

Tips & Common Mistakes

Tips

Remember: lower L/100km is better, while higher mpg is better.
US and Imperial gallons differ, so always check which mpg you're using.
For quick estimates, 235.215 divided by US mpg gives L/100km.
Use this converter for reference; actual fuel economy varies with driving conditions.

Common Mistakes to Avoid

Confusing US mpg with Imperial mpg – they are not the same.
Assuming L/100km and mpg are directly proportional – they are inversely related.
Forgetting to specify the gallon type when quoting mpg values.

Last updated: August 13, 2026