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Fuel Economy Converter

Convert between MPG, L/100km, km/L, and other fuel efficiency measurements.

Our free Fuel Economy Converter lets you convert between MPG, L/100km, km/L, and other fuel efficiency measurements. It is built for travelers, cooks, students, scientists, and anyone working across measurement systems who need fast, reliable results without installing software or creating an account.

Fuel Economy Converter runs entirely in your browser on CalculatorsPlus — enter your values, get instant results, and copy or share your output in one click. Your data never leaves your device; we do not store inputs on any server.

Switching between metric and imperial units is a daily need worldwide. The fuel economy converter uses standard conversion factors so you get consistent results for recipes, travel, homework, and technical specifications.

Results update in real time as you change inputs, so you can explore "what if" scenarios — adjust one variable at a time to see how it affects the outcome before committing to a purchase, plan, or decision.

This page includes step-by-step instructions, frequently asked questions, and practical tips below the calculator. Bookmark it for repeat use — many unit conversion tasks come up weekly during projects, studies, or financial planning.

Common Uses

  • ✓Convert recipe measurements between US and metric units
  • ✓Translate specs for international projects or products
  • ✓Science and engineering homework unit checks
  • ✓Travel, fitness, and weather temperature conversions

How to Use the Fuel Economy Converter

  1. 1

    Enter fuel economy

    Input MPG, L/100km, or km/L.

  2. 2

    Select target unit

    Choose the unit used in your country or comparison.

  3. 3

    Compare vehicles

    Use consistent units when comparing car specs.

💡 Tips & Tricks

  • •EPA (US) and WLTP (Europe) test cycles differ — ratings are not directly comparable.
  • •Real-world economy is usually 10–20% worse than lab figures.
  • •Lower L/100km = better; higher MPG = better.

Frequently Asked Questions

How do I convert MPG to L/100km?
L/100km = 235.215 ÷ MPG (US). Example: 30 MPG ≈ 7.84 L/100km. Lower L/100km means better efficiency.
What is km/L?
Kilometers per liter — used in Japan and some Asian countries. Higher km/L is better. km/L = 100 ÷ L/100km.
US vs UK MPG — are they the same?
No. UK gallons are larger, so UK MPG figures are about 20% higher for the same car. Always check which gallon is used.
What is good fuel economy?
Varies by vehicle class. In the US, 30+ MPG is good for a sedan; 50+ for hybrids. In Europe, under 6 L/100km is efficient for a similar car.

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