What Is a Fuel Cost Calculator?
A fuel cost calculator estimates the amount of fuel consumed by a vehicle and the corresponding driving expense. You enter trip distance, your vehicle’s fuel economy, and the price of fuel in the currency you actually pay. Results help compare routes, plan travel budgets or estimate commuting costs.
How to Use This Calculator
- Enter the values shown in the calculator above.
- Select the appropriate operation or measurement convention where applicable.
- Review the highlighted result and the supporting breakdown.
- Change one input at a time to compare realistic scenarios.
- Refer to the examples and limitations below when interpreting the result.
Formula
Fuel used (L) = distance (km) × consumption (L/100 km) / 100. Cost = litres used × price per litre.
Step-by-Step Example
A 250 km trip at 7 L/100 km and $1.50/L requires 17.5 litres and costs $26.25 one way.
Fuel cost formula in the metric system
For consumption expressed in litres per 100 kilometres, multiply kilometres travelled by the L/100 km number and divide by 100. Then multiply fuel litres by price per litre. A 250 km journey with 7 L/100 km consumption uses 17.5 L; at $1.50/L the fuel cost is $26.25. A return trip over the same route doubles the distance and estimated fuel.
Miles per gallon: US versus UK
MPG stands for miles per gallon, but a US liquid gallon equals approximately 3.785411784 litres while an imperial UK gallon equals 4.54609 litres. These are not interchangeable. If your car advertises UK MPG, select UK MPG. The calculator converts miles to kilometres where needed and uses the corresponding gallon size.
Understanding kilometres per litre
Kilometres per litre measures how far a vehicle can travel on one litre of fuel. Fuel litres are obtained by dividing distance in kilometres by km/L. For example, 300 km at 15 km/L needs 20 litres. Higher km/L represents better efficiency, while lower L/100 km represents better efficiency.
Fuel prices and currency selection
The fuel-price input is per litre in your selected currency. You can enter dollars, euros, pounds or rupees, but choosing another symbol does not automatically convert the price using exchange rates. Always enter a real local price per litre. Some areas display pump prices per US gallon, in which case you must convert the price to litres before entering it.
Why actual fuel costs may differ
Real-world fuel consumption changes with traffic, speed, weather, tyre pressure, passengers, vehicle load, stop-start driving and air-conditioning. Detours and idling may increase fuel use. The tool excludes tolls, parking, maintenance and vehicle depreciation. Treat estimated trip cost as a planning figure, not a guaranteed fuel purchase.