Calculate your car's fuel efficiency from distance and fuel used — get km/L, L/100km, and mpg at once. Switch to Trip Cost mode to plan journey expenses and see your CO₂ footprint.
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Fuel Efficiency
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km/L—
L/100km—
mpg (US)—
mpg (UK / Imperial)—
CO₂ for this journey—
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Trip Estimate
Total Fuel Cost
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Fuel needed—
CO₂ emissions—
How to use
Choose a mode: Calculate Efficiency to find your car's fuel economy, or Trip Cost to plan a journey's expenses.
Select your unit system — Metric (km, litres) or Imperial (miles, gallons).
In Efficiency mode: enter the distance driven and fuel used — km/L, L/100km, and mpg appear instantly.
In Trip Cost mode: enter distance, your car's efficiency, and the current fuel price to get total cost and litres needed.
CO₂ estimates use the standard factor of 2.31 kg per litre of petrol.
Frequently Asked Questions
How do I calculate fuel efficiency in km/L?
Divide the distance travelled (km) by the fuel consumed (litres). For example, 300 km on 25 litres = 12 km/L.
How do I convert km/L to mpg?
Multiply km/L by 2.825 to get mpg (UK) or by 2.352 for mpg (US). For example, 12 km/L ≈ 33.9 mpg (UK) or ≈ 28.2 mpg (US).
What is L/100km?
Litres per 100 kilometres — how many litres of fuel you use for every 100 km driven. Lower is more efficient. A typical car uses 6–10 L/100km.
How much CO₂ does a car emit per litre of petrol?
Burning 1 litre of petrol produces approximately 2.31 kg of CO₂. Diesel produces about 2.68 kg per litre.
What is a good fuel efficiency for a car?
City driving: 7–10 L/100km is typical; below 7 is efficient. Highway: 5–7 L/100km is good; below 5 is excellent. Hybrids can achieve 3–5 L/100km.
Did you know?
A Formula 1 car uses about 2.5 L/100km at racing speeds but consumes enormous energy through its kinetic energy recovery system — the total energy expenditure per km is far higher than road cars.
The Volkswagen XL1, designed as the most fuel-efficient production car ever, achieved 0.9 L/100km (263 mpg) using a 48 hp diesel-hybrid drivetrain and a carbon-fibre body weighing only 795 kg.
Cars emit their mass in CO₂ roughly every 10,000–15,000 km. A 1,200 kg car produces about 1,200 kg of CO₂ for every 10,000–15,000 km driven on a typical petrol engine.