Fuel Cost Calculator

Calculate trip fuel cost free online from distance, fuel efficiency, and price per liter or gallon. Plan road trip budgets or compare vehicle running costs accurately.

Trip Distance (km or miles)

Fuel Efficiency (distance/unit fuel)

Price per Unit of Fuel

Browser only.

How to Use This Tool

Enter trip distanceOne-way or round-trip total, your choice

Enter fuel efficiency and priceUse consistent units throughout

See fuel needed and total costPlan your trip budget accurately

Fuel Cost Calculator is a free online tool that works entirely in your browser — no signup, no data uploaded, no limits.

Consistent Units Are the Only Real Requirement

This calculation works identically whether you're using kilometers and liters, miles and gallons, or any other consistent unit pairing -- the math (distance divided by efficiency, multiplied by price) doesn't care which unit system you use, as long as efficiency and distance share the same distance unit.

City Versus Highway Efficiency

Using a trip-appropriate efficiency figure rather than a single blended average improves accuracy meaningfully -- a highway-heavy road trip should use highway efficiency, while a city-driving estimate should use city efficiency, since the difference between the two can be substantial for the same vehicle.

Comparing Vehicles on Equal Footing

Running the identical trip and fuel price through this calculator for two different vehicles' efficiency ratings gives a direct, concrete cost comparison -- useful when weighing a more fuel-efficient option against other factors in a vehicle decision.

Frequently Asked Questions

Fuel needed = Distance / Fuel Efficiency, then Cost = Fuel needed x Price per unit. This works whether your efficiency is in km/liter, miles/gallon, or any consistent unit pairing, as long as distance and efficiency use matching units.

Stop-and-go city driving requires repeated acceleration from a stop, which is far less fuel-efficient than maintaining steady highway speed. Using a trip-appropriate efficiency figure (city vs highway) rather than one blended average improves estimate accuracy.

Yes, simply enter the round-trip total distance rather than one-way distance, and the calculation applies the same logic to the full journey distance.

Run the same trip distance and current fuel price through the calculator using each vehicle's actual fuel efficiency rating, then compare the resulting costs directly -- a practical way to quantify the cost difference between vehicle options being considered.

No, it uses a single price per unit you provide. For trips crossing regions with significantly different fuel prices, you'd need to estimate an average price or calculate segments separately for more accuracy.