How is total fuel used calculated?

All inputs are converted to metric internally. MPG is converted to L/100 km using the formula 235.215 ÷ MPG. Fuel used in liters = (distance in km × L per 100 km) ÷ 100. The result is then displayed in both liters and US gallons (1 US gallon = 3.78541 liters).

How is cost per passenger calculated?

Total fuel cost is divided equally among all passengers you enter. If one person is driving and carries three passengers, enter 4 to split the cost among all four people in the vehicle.

What is the difference between MPG, L/100 km, and km per liter?

MPG (miles per gallon) is the US standard — higher is better. L/100 km (liters per 100 kilometers) is the European metric standard — lower is better. Km per liter is common in Asia and Latin America — higher is better. The calculator converts all three to L/100 km before computing.

Does this tool work for diesel, electric, or hybrid vehicles?

This tool calculates fuel cost for any liquid fuel (gasoline, diesel, E85, etc.) as long as you enter the correct fuel efficiency and price. For electric vehicles, use the L/100 km field as a proxy for kWh/100 km and enter the cost per kWh as your fuel price.

Fuel Cost Calculator

Name: Fuel Cost Calculator
Availability: InStock
Author: Nham Vu

Enter your trip distance, vehicle MPG (or L/100 km, or km/L), the current fuel price, and number of passengers. Instantly see total fuel used, total cost, cost per passenger, and cost per mile or km.

Trip Details

Distance

Fuel Efficiency

Miles per gallon (higher = more efficient)

Fuel Price

Currency

Passengers

Enter trip details on the left and click Calculate

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Summary

Enter your trip distance, vehicle MPG (or L/100 km, or km/L), the current fuel price, and number of passengers. Instantly see total fuel used, total cost, cost per passenger, and cost per mile or km.

How it works

Enter the total trip distance and choose miles or kilometers.
Enter your vehicle's fuel efficiency and select the unit (MPG, L/100 km, or km/L).
Enter the current fuel price per gallon or per liter and pick your currency symbol.
Enter the number of passengers sharing the fuel cost (default is 1).
Click Calculate to see total fuel used, total cost, cost per passenger, and cost per mile/km.
Click Reset to clear all fields and start over.

Use cases

Estimating gas money before a long road trip so you can budget accurately.
Splitting fuel costs fairly among carpoolers or group travelers.
Comparing the fuel expense of two different routes with different distances.
Converting between MPG and L/100 km while calculating trip cost simultaneously.

Frequently Asked Questions

Last updated: 2026-06-10 · Reviewed by Nham Vu