What does mpg stand for?

Miles Per Gallon — a fuel economy unit used in the US and UK.

Is a lower L/100km value better?

Yes. It means less fuel is needed to drive 100 km.

Why is lower better for L/100km?

It measures fuel consumed per 100 km — a consumption figure. km/L and MPG measure efficiency (distance per fuel), so they move the opposite way.

Why do US and UK MPG differ?

Their gallons differ: 1 UK gal = 4.546 L vs 1 US gal = 3.785 L, so UK MPG reads about 20% higher for the same economy.

⛽ Fuel Economy Converter

Convert km/L, mpg, L/100km instantly.

How it works

Type a value in the left field.
Pick the units to convert from and to.
The result updates instantly, with a full reference table below.

Key units & conversion basis

Fuel economy uses inversely related units, so simple multiplication does not work. km/L and MPG measure distance per fuel unit (higher is better), while L/100km measures fuel per distance (lower is better).

Unit	Symbol	Character	Common use
Km per liter	km/L	높을수록 좋음 / higher = better	Korea
Liters per 100km	L/100km	낮을수록 좋음 / lower = better	Europe
MPG (US)	mpg	높을수록 좋음 / higher = better	US
MPG (UK)	mpg	높을수록 좋음, US보다 수치 큼 / higher, larger than US	UK

🧮 How the conversion is calculated

Key formula: L/100km = 100 ÷ (km/L). Example: 15 km/L → 100 ÷ 15 = 6.67 L/100km. In MPG: 15 × 2.352 = 35.3 mpg (US), 15 × 2.825 = 42.4 mpg (UK).

🎯 When to use this

Convert overseas car fuel economy (mpg) to km/L
Compare European-style fuel economy (L/100km) to familiar units
Compare new car fuel economy figures on the same scale
Compare mpg or L/100km figures in overseas car reviews to familiar km/L

📖 Guide: Converting Fuel Economy — mpg to km/L and L/100km →

Frequently Asked Questions

What does mpg stand for?: Miles Per Gallon — a fuel economy unit used in the US and UK.
Is a lower L/100km value better?: Yes. It means less fuel is needed to drive 100 km.
Why is lower better for L/100km?: It measures fuel consumed per 100 km — a consumption figure. km/L and MPG measure efficiency (distance per fuel), so they move the opposite way.
Why do US and UK MPG differ?: Their gallons differ: 1 UK gal = 4.546 L vs 1 US gal = 3.785 L, so UK MPG reads about 20% higher for the same economy.