Fuel Cost Calculator

How Fuel Cost Calculation Works

Calculating fuel costs is essential for trip budgeting, comparing vehicles, and understanding your transportation expenses. The basic formula is straightforward: divide your trip distance by your vehicle's fuel efficiency to find how much fuel you need, then multiply by the price per unit of fuel. This gives you the total fuel cost for your journey.

In the United States, fuel efficiency is measured in miles per gallon (MPG). A car rated at 30 MPG travels 30 miles on one gallon of gasoline. Most of the world uses liters per 100 kilometers (L/100km), where a lower number indicates better efficiency. To convert between systems, divide 235.215 by the value in either unit. For example, 30 MPG equals approximately 7.84 L/100km.

This calculator supports both unit systems and shows the fuel needed, total cost, and cost per mile or kilometer. Fuel costs can vary significantly based on driving conditions. Highway driving is typically 10-20 percent more fuel-efficient than city driving due to consistent speeds. Other factors affecting fuel economy include tire pressure, vehicle weight, air conditioning use, and driving speed. Keeping your vehicle well-maintained and driving at moderate speeds are the most effective ways to reduce fuel consumption and costs.