Free fuel cost calculator. Enter trip distance, fuel efficiency and pump price to see how many litres you'll burn and the total trip cost.
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Enter your trip distance in kilometres, your vehicle's fuel efficiency in litres per 100 km and the pump price per litre. The calculator works out the litres needed, distance × efficiency ÷ 100, then multiplies by the price to give your total fuel cost, showing exactly how much of the trip budget goes to fuel. It is an estimate: traffic, load, air conditioning and driving style all move the real number.
Two steps: fuel needed = trip distance × fuel efficiency ÷ 100, then total cost = fuel needed × price per litre. For a 100 km trip in a car using 8 L/100km, that is 8 litres; at 2.50 per litre the trip costs 20.00. Cost per kilometre is simply total cost ÷ distance, a handy figure for comparing cars, budgeting a commute, or splitting a road trip per person fairly.
Enter the full trip distance in kilometres, double a one-way figure for a round trip. Add your car's consumption in L/100km (check the trip computer or work it out from your last fill-ups) and the price you actually pay per litre at the pump. The formula works for petrol and diesel cars alike, only the price per litre changes. The results show the litres you will burn and the total cost before you turn the key.
The US measures economy in miles per gallon, where higher is better; most of the world uses litres per 100 km, where lower is better. To convert: L/100km = 235.215 ÷ MPG, and km/L = 100 ÷ L/100km. So 30 MPG is about 7.8 L/100km, and 8 L/100km equals 12.5 km/L. Use this conversion whenever your car reports its economy in MPG, then enter the L/100km figure.
Window-sticker figures are optimistic: real-world economy usually runs 10–15% lower thanks to city traffic, cold starts, hills, air conditioning and extra weight. The most accurate number comes from your own fill-ups, note the odometer at a full tank, then divide the litres at the next full fill-up by the kilometres driven. Use that figure for the tightest estimate.
Proper tyre pressure alone can save up to 3%, and smooth acceleration, cruise control on highways and reduced idling all add up. Removing roof boxes and excess weight helps, as does combining short trips, a cold engine drinks far more than a warm one. Even a 0.5 L/100km improvement saves hundreds per year for a regular commuter, so small habits compound fast.
Divide the distance by your efficiency to get the fuel needed, then multiply by the price: fuel = distance × (L/100km) ÷ 100, cost = fuel × price per litre. Example: 400 km at 8 L/100km uses 32 litres; at 2.50 per litre that is 80.00.
L/100km is the litres of fuel used to travel 100 km, lower is better. MPG is the miles travelled per gallon, higher is better. Convert with L/100km = 235.215 ÷ MPG. L/100km is standard across Europe, Canada and Australia; MPG is used in the US and UK.
Fill the tank completely and note the odometer. At the next full fill-up, divide the litres you added by the kilometres driven, then multiply by 100. That L/100km figure reflects your real driving, traffic, load and all, and beats the brochure number.
Yes, simply enter the total round-trip distance. If your one-way trip is 150 km, enter 300 km. For a daily commute, multiply the daily distance by the number of days to budget the week or month.
No, the calculator covers fuel only. Tolls, parking, servicing and tyre wear add to what a trip really costs, so treat the fuel figure as the minimum and budget the extras separately.
Traffic, short trips, a heavy load, air conditioning, under-inflated tyres and hard acceleration all push consumption above the rated figure. Hilly roads and high motorway speeds do too. If your number is consistently 10–15% over the estimate, that is normal, feed your measured consumption back into the calculator.
Keep tyres at the correct pressure, remove excess weight and roof boxes, accelerate gently, use cruise control on highways and avoid idling. Plan routes to combine short trips, since a cold engine uses far more fuel. Even a 0.5 L/100km improvement can save hundreds per year.
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