Enter your trip distance, fuel efficiency, and fuel price to find out exactly how much fuel your vehicle will consume and what it will cost. Choose your preferred units — miles/km, mpg or L/100km — and the calculator returns total fuel used, total fuel cost, and a clear breakdown of your trip expenses.
Total Fuel Cost
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Fuel Used (Liters)
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Fuel Used (Gallons)
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Consumption per 100 km
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Cost per km
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Fuel consumption is a measure of how much fuel a vehicle uses to travel a given distance. It is typically expressed as liters per 100 km (L/100km) in metric countries or miles per gallon (mpg) in the US and UK. A lower L/100km value or a higher mpg value means the vehicle is more fuel-efficient.
To calculate fuel consumption, divide the total fuel used by the distance traveled. For example, if you used 40 liters to drive 500 km, your consumption is 40 ÷ 500 × 100 = 8 L/100km. This calculator does that math for you automatically once you enter your trip details.
First, find your vehicle's fuel efficiency in miles per gallon (mpg). Then divide the fuel price per gallon by the mpg rating to get the cost per mile. For example, if gas costs $3.50/gallon and your car gets 28 mpg, the cost per mile is $3.50 ÷ 28 = $0.125 per mile.
Divide the total liters of fuel used by the total kilometers traveled, then multiply by 100. The formula is: (Fuel used in liters ÷ Distance in km) × 100 = L/100km. For instance, using 7.5 liters over 100 km gives a consumption rate of 7.5 L/100km.
Several factors influence fuel consumption, including driving speed (highway vs. city), vehicle weight, engine size and condition, tire pressure, air conditioning use, road terrain, and driving habits like hard braking or rapid acceleration. Keeping your vehicle well-maintained can significantly improve fuel efficiency.
To convert miles per gallon (mpg) to liters per 100 km, divide 235.215 by the mpg value. For example, 30 mpg equals 235.215 ÷ 30 = 7.84 L/100km. To go the other direction, divide 235.215 by the L/100km figure to get mpg.
Manufacturer fuel economy figures are measured under controlled laboratory conditions. Real-world consumption is typically higher due to traffic conditions, driving style, climate, vehicle load, and the use of features like air conditioning and heating. It is common to see 10–20% higher consumption in everyday driving.
You can reduce fuel costs by maintaining a steady highway speed, keeping tires properly inflated, removing unnecessary weight from the vehicle, avoiding excessive idling, and planning routes to minimize stop-and-go traffic. Using cruise control on highways also helps maintain an efficient speed.