L/100km Fuel Consumption Calculator
Convert miles per gallon to litres per 100km or calculate fuel consumption from distance and litres used.
How to use this tool
- Enter distance and litres used in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your fuel consumption and the full breakdown beneath it.
Calculate your vehicle's fuel consumption in litres per 100 kilometres.
⚠ This tool provides general estimates for education only and is not financial, tax or legal advice. Figures may not reflect your situation — verify with a qualified professional.
Formula
Fuel consumption (L/100km) = Litres used ÷ Distance (km) × 100
L/100km = litres / distance × 100
How it works
This calculator measures fuel efficiency by dividing the total volume of fuel consumed (in litres) by the distance driven (in kilometres), then multiplying by 100 to express the result per 100 km — the standard fuel economy unit used in most countries outside the United States.
The result reflects real-world consumption for the trip entered; it assumes the litres and distance values accurately represent the same journey (e.g., filling up at the start and end of a measured trip). No adjustments are made for driving style, terrain, or fuel type.
Worked example
- Distance driven: 500 km. Fuel used: 40 L.
- Divide fuel by distance: 40 ÷ 500 = 0.08 L/km.
- Multiply by 100 to convert to per-100 km basis: 0.08 × 100 = 8.0 L/100km.
Fuel consumption = 8.0 L/100km
Common mistakes to avoid
- Entering distance in miles instead of kilometres — 1 mile = 1.609 km, so the error inflates or deflates consumption by 60%.
- Reading litres from the fuel gauge estimate rather than the pump meter — fuel gauge accuracy is typically plus or minus 10%.
- Forgetting that lower L/100 km means better efficiency, unlike MPG where a higher number is better — easy to misread which option is more fuel-efficient.
Key terms
- L/100km
- Litres per 100 kilometres — the standard metric unit for fuel consumption; lower values mean better fuel efficiency.
- Fuel efficiency
- A measure of how far a vehicle travels per unit of fuel consumed.
- MPG (miles per gallon)
- The imperial/US equivalent of fuel economy; higher MPG means better efficiency, opposite in direction to L/100km.
- Trip consumption
- The actual fuel used over a measured journey, as opposed to a manufacturer's rated figure.
Frequently asked questions
- What is a good L/100km?
- A fuel-efficient car typically uses 5–7 L/100km. SUVs may use 10–14 L/100km.