Fuel Economy Converter

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Sang

km/L và MPG: số lớn = tiết kiệm hơn. L/100km và gal/100mi: số nhỏ = tiết kiệm hơn.

Fuel Economy Converter

This fuel economy converter lets you switch between the world's most common efficiency units — km/L, L/100km, US MPG, UK MPG, and gallons per 100 miles — all at once from a single input. Whether you're comparing vehicles listed in different markets, checking manufacturer specs against your country's standard, or budgeting fuel costs for a road trip abroad, you get instant and precise results. No downloads, no accounts, completely free.

Benefits

Fuel economy figures look very different depending on where a vehicle is sold, making direct comparisons tricky without a reliable converter. This tool offers:

Simultaneous conversion: Enter one value and see all equivalent units displayed at the same time, eliminating multiple calculations.
Internationally accurate factors: Uses verified conversion constants between metric and imperial systems, so results match official figures.
Full unit coverage: Handles km/L, L/100km, US MPG, UK MPG, and gallons per 100 miles — the five units used across the majority of global auto markets.
Zero friction: No rate limits, no account wall, and no ads interrupting your workflow.

Use cases

Situations where this converter saves you time and avoids costly mistakes:

Comparing fuel efficiency of imported cars listed in US MPG against local L/100km specs.
Reading UK car reviews that cite MPG figures and converting them to a metric equivalent you're familiar with.
Calculating trip fuel costs when renting a car overseas where the posted efficiency is in unfamiliar units.
Fleet managers and logistics teams standardising fuel performance data across vehicles from different regions.
Students and engineers working on transportation or energy problems that require unit-consistent calculations.

How to use

Converting between fuel economy units takes three steps:

Step 1: Select your source unit from the dropdown — choose km/L, L/100km, US MPG, UK MPG, or gallons per 100 miles.
Step 2: Type your fuel economy figure into the input field.
Step 3: All equivalent values in the remaining units appear instantly — copy whichever you need.

Frequently asked questions

What is the difference between US MPG and UK MPG? The US gallon equals 3.785 litres while the UK imperial gallon equals 4.546 litres, so a UK MPG figure is roughly 20% higher than the same number expressed in US MPG — they cannot be compared directly without conversion.

Is a higher or lower L/100km better? Lower is better: L/100km measures how many litres are consumed per 100 kilometres travelled, so a car rated at 5 L/100km is more efficient than one rated at 8 L/100km.

Why do some countries use L/100km while others use MPG? It comes down to historical measurement systems — metric countries adopted L/100km because it integrates naturally with litres and kilometres, while the US and UK historically standardised around miles and gallons, making MPG the familiar unit there.

Can I use this converter for motorcycles or trucks? Yes — fuel economy conversion is purely mathematical and applies to any internal combustion vehicle regardless of type or size, as long as the efficiency figure you enter is measured in one of the supported units.