Fuel Cost Calculator

The calculator divides your trip distance by your vehicle's fuel efficiency to determine how many gallons (or liters) of fuel you'll use, then multiplies that by the gas price. All units are converted to a common base internally so you can mix and match miles, km, mpg, or L/100km freely.

The biggest factors are trip distance, your vehicle's fuel efficiency (mpg or L/100km), and the current gas price in your area. Driving style, road conditions, speed, tire pressure, air conditioning use, and vehicle load can also significantly impact real-world fuel economy.

To convert mpg to L/100km, divide 235.21 by the mpg value. For example, 30 mpg equals approximately 7.84 L/100km. The calculator handles this conversion automatically when you select your preferred efficiency unit.

Maintain steady highway speeds, keep tires properly inflated, reduce excess vehicle weight, and use cruise control where possible. Planning your route to avoid heavy traffic and combining multiple errands into one trip also helps reduce overall fuel consumption.

The average fuel economy for a new passenger car in the US is around 28–32 mpg (7.4–8.4 L/100km). Older vehicles, trucks, and SUVs typically get 15–25 mpg, while hybrids and EVs can exceed 50 mpg equivalent. Check your vehicle's door sticker or owner's manual for the official rating.

This calculator uses a single fuel efficiency figure you provide. For a mixed trip, enter your combined mpg or L/100km figure (typically found on your window sticker or fuel economy guide) to get the most realistic estimate.

According to the American Automobile Association (AAA), the average American driver spends around $3,000 per year on gasoline. This varies significantly by location, vehicle type, and annual mileage driven.

Yes. Select kilometers for distance, L/100km (or km/L) for fuel efficiency, and price per liter for gas price to match the metric units used in Europe, Canada, and most other countries outside the US.