Fuel Cost Calculator
Free fuel cost calculator: estimate the gas cost of any road trip, split it by passenger, and project your monthly and annual fuel spend. 100% in your browser.
Updated June 2026
Trip Estimate
Liters Needed
36.0 L
Estimated Total Cost
$39.60
Cost per Person
$39.60
Cost Report
Estimated Total Cost
$39.60
Cost per Person
$39.60
Liters Needed
36.0 L
Monthly Projection
Liters/month
120.0 L
Monthly expense
$132.00
Annual expense
$1,584.00
How the fuel cost calculator works
Distance, fuel economy and price — the cost appears instantly
1. Enter distance and fuel economy
Trip distance in km and your car's average fuel economy in km/L.
2. Enter the fuel price
Price per liter at the station where you usually fill up.
3. Split it between passengers (optional)
Divide the total trip cost by however many people are riding along.
What this fuel cost calculator does
From a single trip to a full monthly projection
Cost per trip and per passenger
Automatically splits the total fuel cost across the number of people in the car.
Monthly and annual projection
Estimate fuel spend over a month or a year based on your regular driving distance.
"Worth the detour?" panel
Compares the savings from a cheaper gas station against the fuel burned getting there.
Calculate in km/L or l/100km
Use whichever fuel economy unit you already know, no manual conversion needed.
Example scenarios
How people typically set up the calculator
When you'll reach for this calculator
The most common scenarios among people who use this tool
Carpools and group road trips
Split the fuel cost fairly between everyone riding along, no spreadsheet needed.
Monthly budgeting
Project this month's fuel spend based on your daily commute distance.
Deciding where to fill up
Use the detour panel to check if a cheaper but farther gas station is actually worth it.
Rideshare and delivery drivers
Work out the real fuel cost per ride or per shift to see what you're actually taking home.
Common mistake? Start here
Ignoring the fuel burned on the detour itself
A cheaper station only pays off if the savings beat the cost of getting there — the "worth the detour?" panel already does that math for you.
Using city fuel economy for a highway trip
Fuel economy varies a lot between city and highway driving — adjust the km/L figure to match the type of trip.
Forgetting the return leg in a trip projection
For a round trip, remember to double the distance before calculating the total fuel cost.
Why use this fuel cost calculator
The "worth the detour?" panel is what sets it apart: instead of just showing which station has the lower price per liter, it works out whether driving there actually pays off once you subtract the fuel burned on the way.
The monthly and annual projection turns a one-off trip estimate into a recurring budget number, so you can see how fuel costs actually add up over the year, not just for a single drive.
Frequently asked questions
Enter the distance in km, your car's average fuel economy in km/L, and the fuel price per liter. The calculator divides distance by fuel economy to get the liters needed, then multiplies by the price to give you the total cost automatically.
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