layout: tool title: Fuel Economy Calculator | km/L, L/100km, and fuel cost at once description: Calculate fuel economy in km/L from distance and fuel used, then check L/100km, total fuel cost, and cost per km in one place. lang: en permalink: /en/tools/fuel-economy-calculator/ canonical_url: /en/tools/fuel-economy-calculator/ category: calculator category_label: Auto/Cost thumbnail: /assets/thumbs/en/fuel-economy-calculator.svg image: path: /assets/thumbs/en/fuel-economy-calculator.svg alt: Fuel economy calculator thumbnail tool_key: fuel-economy-calculator keywords: [fuel economy calculator, km per liter calculator, fuel cost per km, gas mileage calculator, liters per 100km] related_tools: [average-speed-calculator, unit-converter, percent-calculator] faq:

  • q: What is the difference between km/L and L/100km? a: km/L tells you how far the car goes with 1 liter of fuel, while L/100km shows how many liters are needed to drive 100km. They express the same efficiency from different angles.
  • q: Do I need to enter fuel price? a: No. Fuel economy can be calculated with distance and fuel used only. If you add price per liter, the tool also calculates total fuel cost and cost per km.
  • q: Can I use this for EV efficiency? a: This tool is designed for liquid fuel and liters. It is not meant for EV efficiency in kWh.—

When this fuel economy calculator is useful

After a trip or a refill, you may want to know your real fuel economy and how much that drive actually cost.

This tool lets you enter:

  • Distance traveled (km)
  • Fuel used (L)
  • Fuel price per liter (optional)

Then it instantly shows km/L, L/100km, total fuel cost, and fuel cost per km.

How it works

  1. Distance ÷ Fuel used = km/L
  2. 100 ÷ km/L = L/100km
  3. Fuel used × Price per liter = Total fuel cost
  4. Total fuel cost ÷ Distance = Cost per km

Example

  • Distance: 420km
  • Fuel used: 28L
  • Price per liter: 1,720 KRW

→ Fuel economy: 15.00 km/L
→ Fuel use per 100km: 6.67 L
→ Total fuel cost: 48,160 KRW
→ Fuel cost per km: about 115 KRW

Good companion tools

FAQ

Is a higher km/L better?

Yes. A higher km/L means your car travels farther with the same amount of fuel.

Is a lower L/100km better?

Yes. A lower L/100km means less fuel is needed to travel the same distance.

Why should I enter fuel price?

Adding fuel price helps you translate efficiency into real driving cost, including total fill cost and cost per km.