Fuel Economy Converter - MPG L/100km Converter Online
Convert between MPG (US), MPG (UK), L/100km, and km/L fuel economy units. Compare fuel efficiency across regions.
How to use this calculator
👉 Fill in the boxes below and your answer appears instantly — no maths needed, we do it all for you! 🎉
In plain English — what does this do?
📏 Some countries say ‘30 degrees’ and others say ‘86 degrees’ for the same weather! Some say ‘5 km’, others say ‘3 miles’. This tool swaps between them instantly so you always know what it means.
A fuel economy converter lets you compare vehicle efficiency across the different standards used around the world. The US uses miles per gallon (MPG), the UK also uses MPG but with the larger imperial gallon, and most other countries use litres per 100 kilometres (L/100km) or kilometres per litre (km/L). Converting between them is essential when comparing international car specs or planning road trips across borders.
Result
—
—
All conversions
What is Fuel Economy Converter - MPG L/100km Converter Online?
A fuel economy converter lets you compare vehicle efficiency across the different standards used around the world. The US uses miles per gallon (MPG), the UK also uses MPG but with the larger imperial gallon, and most other countries use litres per 100 kilometres (L/100km) or kilometres per litre (km/L). Converting between them is essential when comparing international car specs or planning road trips across borders.
How to use it
- 1️⃣ Enter your fuel economy value in the Value field.
- 2️⃣ Select the unit you are converting from in the From dropdown.
- 3️⃣ Select the target unit in the To dropdown.
- 4️⃣ The result and a full comparison table appear immediately.
- 5️⃣ Use the swap button to reverse the conversion direction.
Formula
💡 See it in action — a real example
❓ Common questions
- Why do US MPG and UK MPG differ for the same car?
- The US gallon equals 3.785 litres while the UK imperial gallon equals 4.546 litres. The same car will show a higher MPG figure in UK units because more miles fit per larger gallon. A car getting 30 US MPG gets approximately 36 UK MPG.
- Is a higher or lower L/100km better?
- Lower L/100km is better because it means the car uses less fuel to travel 100 kilometres. A car using 5 L/100km is more efficient than one using 8 L/100km. This is the opposite of MPG where higher numbers are better.
- How do I convert L/100km to MPG?
- Use the formula: US MPG = 235.215 / L100km. For example, a car using 7 L/100km = 235.215 / 7 = 33.6 US MPG. This converter handles the calculation automatically.
- What is considered good fuel economy?
- For a petrol/gasoline car, under 6 L/100km (above 39 US MPG) is generally considered excellent. 7 to 9 L/100km (26 to 34 MPG) is average. Hybrid cars typically achieve 4 to 5 L/100km and electric vehicles are rated in km per kWh instead.
- What is km/gallon?
- Kilometres per US gallon expresses how many kilometres a vehicle travels on one US gallon of fuel. It is less common than MPG or L/100km but appears in some international contexts. 1 km/gal equals approximately 0.264 km/L or 0.425 US MPG.