Fuel Cost Calculator
Estimate how much your trip will cost in fuel. Simple, fast and free.
Calculate your fuel cost
Enter your trip information below.
How fuel cost is calculated
Fuel cost depends on three main factors: the distance you travel, your vehicle's fuel economy, and the current fuel price.
First, the calculator determines how much fuel your vehicle is expected to use. It then multiplies the estimated fuel consumption by the fuel price.
Because the calculation uses your actual distance, fuel economy and fuel price inputs, changing any of these values changes the estimated trip cost.
Fuel cost formula
Fuel used = Distance ÷ Fuel economy
Trip cost = Fuel used × Fuel price
The calculation automatically adjusts to the distance and fuel economy unit you select, including miles, kilometers, MPG and km/L.
Example: 500-mile trip
Suppose you travel 500 miles in a vehicle that averages 30 MPG, and fuel costs $3.50 per gallon.
Fuel used = 500 ÷ 30 = 16.67 gallons
Trip cost = 16.67 × $3.50 = $58.33
In this example, the estimated fuel cost is $58.33.
Calculate your trip in seconds.
Enter your distance, vehicle fuel economy and current fuel price. HARTI Tools calculates the estimated fuel consumption and trip cost.
Enter your distance
Choose miles or kilometers and enter the distance you expect to travel.
Enter your fuel economy
Use the fuel economy value for your vehicle in MPG or km/L.
Enter fuel price
Choose the price per gallon or liter and enter the current fuel price.
Review the result
The calculator shows estimated fuel used, total trip cost and cost per mile or kilometer.
Why your actual fuel cost may be different
The calculator provides an estimate based on the information you enter. Real-world fuel consumption can vary because driving conditions are not always the same as the conditions used to determine a vehicle's published fuel economy.
The most important factors affecting the estimate are distance, fuel economy and fuel price.
Driving conditions
Traffic, hills, road conditions and frequent stops can affect actual fuel consumption.
Driving style
Speed, acceleration, braking and vehicle load can change fuel consumption.
Fuel price
Fuel prices can change over time and may differ between locations and stations.
Vehicle condition
Tire pressure, maintenance, mechanical condition and vehicle load can influence fuel consumption.
When to use a fuel cost calculator
A fuel cost calculator can help you estimate travel expenses before you start a trip. It is useful when planning a road trip, comparing vehicles or estimating the cost of regular driving.
It can also help you compare different scenarios by changing the distance, fuel economy or fuel price and observing how the estimated cost changes.
Plan a road trip
Estimate how much you may spend on fuel based on the total distance, vehicle fuel economy and fuel price.
Estimate commuting costs
Calculate the fuel cost of regular driving by entering your expected distance and vehicle fuel economy.
Compare vehicles
Use different fuel economy values to compare the estimated fuel cost of vehicles over the same distance.
Estimate a travel budget
Add the estimated fuel expense to your other travel costs when planning a trip budget.
Use the estimate to make a better travel decision.
The trip cost shown by the calculator is an estimate that can be used as a planning reference. It helps you understand the expected fuel expense before committing to a trip or comparing vehicles.
For a more realistic travel budget, combine the estimated fuel cost with other expenses such as tolls, parking, food, accommodation and maintenance when applicable.
If fuel prices or trip conditions change, update the inputs and calculate again instead of relying on an older estimate.
An estimate is not the same as actual fuel consumption.
This calculator uses the fuel economy value you provide. If your vehicle normally consumes more or less fuel than that value, the actual cost will also be different.
For the most useful estimate, use a fuel economy value that reflects your normal driving conditions. If you have recorded your own fuel consumption over several refueling cycles, that value may provide a more realistic reference than a published rating.
Fuel prices should also be updated whenever you want to make a current travel budget.
Frequently asked questions
Common questions about estimating fuel consumption and trip costs.
What information do I need?
You need the distance you plan to travel, your vehicle's fuel economy and the current fuel price.
Can I use kilometers and km/L?
Yes. The calculator supports kilometers for distance and km/L for fuel economy.
Can I use miles and MPG?
Yes. Miles and MPG can be used together with a fuel price entered per gallon.
Does the calculator include tolls or parking?
No. The result represents estimated fuel cost only. Tolls, parking, food, accommodation and other travel expenses should be added separately.
Does it calculate round-trip fuel cost?
The calculator uses the distance you enter. To estimate a round trip, enter the total round-trip distance.
Why is my real fuel cost different?
Actual fuel consumption can differ because of traffic, speed, driving style, road conditions, vehicle load, weather, maintenance and other factors.
Should I use the vehicle manufacturer's fuel economy?
You can use the manufacturer's published value, but your own measured fuel economy may provide a more realistic estimate for your normal driving conditions.
Should I use the exact current fuel price?
For a current travel budget, use the most recent fuel price available for the location where you expect to refuel.
Is the result a guaranteed fuel expense?
No. The result is an estimate intended for planning and comparison. Actual fuel consumption and fuel prices may differ.