Estimate the fuel cost of a trip. This free fuel cost calculator uses your distance, fuel economy and fuel price — in US or metric units — to show total cost, fuel used and cost per mile or kilometre.
Trip & vehicle
miles
mpg
/ gal
Enter the trip distance, your vehicle’s fuel economy and the fuel price. Tick “round trip” to double the distance for a there-and-back journey.
Fuel cost
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Enter your trip
Fuel used
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Cost per distance unit
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Total distance
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Cost per 100
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Fuel cost = (distance ÷ fuel economy) × fuel price. Use your real-world economy for the most accurate figure — actual mileage varies with driving style, load, terrain and weather.
Use this free fuel cost calculator to work out how much a trip will cost in fuel. Enter the distance, your vehicle’s fuel economy and the fuel price — in US or metric units.
What this fuel cost calculator does
A fuel cost calculator estimates the fuel cost of a journey. It works out how much fuel the trip uses from your distance and economy, then multiplies by the price per gallon or litre — with an option for round trips.
A 300-mile trip at 30 mpg with fuel at $3.50/gal uses 10 gallons and costs $35. In metric, 500 km at 7 L/100km and $1.80/L uses 35 litres and costs $63.
Example trip costs (US)
Distance
25 mpg @ $3.50
40 mpg @ $3.50
100 mi
$14.00
$8.75
300 mi
$42.00
$26.25
500 mi
$70.00
$43.75
Fuel cost vs fuel economy
This tool tells you the cost of a specific trip. To measure how efficient your vehicle is in the first place — your actual miles per gallon — use the Miles Per Gallon calculator and bring that figure back here.
How to use the fuel cost calculator
Choose US or metric units.
Enter distance, fuel economy and price.
Tick round trip if needed and read the cost.
Fuel Cost FAQ
How do I calculate the fuel cost of a trip?
Divide the distance by your fuel economy to get the fuel used, then multiply by the price. For example, 300 miles ÷ 30 mpg = 10 gallons, × $3.50 = $35.
Can I use kilometres and litres?
Yes. Switch to metric and enter distance in km, consumption in L/100km and price per litre. 500 km at 7 L/100km and $1.80/L costs about $63.
How do I include the return journey?
Tick "round trip" and the calculator doubles the distance for a there-and-back total.
What fuel economy figure should I use?
Your real-world figure is most accurate. If you don't know it, work it out with the Miles Per Gallon calculator from a recent tank.
Why might my actual cost differ?
Real fuel use changes with driving style, traffic, load, terrain and weather, and prices vary between stations — so treat the result as a close estimate.
Is the fuel cost calculator free?
Yes, this fuel cost calculator is completely free, needs no sign-up, and gives instant results in your browser.
