Fuel Cost Calculator
Estimate the fuel cost of a trip from the distance, your fuel economy, and the price of fuel, in imperial (mpg) or metric (L/100km), with a round-trip option. Calculates in your browser.
Total fuel cost
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Show the math
Fuel needed depends on whether economy is mpg or L/100km:
imperial: fuel = distance ÷ mpg
metric: fuel = distance ÷ 100 × (L/100km)
cost = fuel × price
Round trip doubles the distance. Real-world economy varies with speed, load, terrain and weather, so treat this as a planning estimate. All math runs locally in your browser.
What this does
A fuel cost calculator estimates the fuel cost of a trip from the distance, your fuel economy, and the price of fuel, in imperial (mpg) or metric (L/100km), with a round-trip option.
How it works
It works out the fuel needed for the distance (distance ÷ mpg in imperial, or distance ÷ 100 × L/100km in metric) then multiplies by the price per gallon or litre.
Cost = (distance ÷ mpg) × price per gallon
How to use it
- Choose imperial or metric units.
- Enter the distance and fuel economy.
- Enter the fuel price.
- Read the trip fuel cost.
Understanding your result
Quoted economy is measured in ideal conditions. City driving, high speeds, heavy loads, hills, and cold weather all use more fuel, so treat the result as a planning estimate.
Example
A 300-mile trip at 30 mpg with $3.50 fuel costs about $35.
Sources & methodology
- U.S. DOE/EPA, fueleconomy.gov, Official fuel economy ratings and trip costs
Last updated .
Frequently asked questions
How is fuel cost calculated?
The tool works out the fuel needed for the distance (distance ÷ mpg in imperial, or distance ÷ 100 × L/100km in metric) then multiplies by the price per gallon or litre.
Does it handle round trips?
Yes. Tick the round-trip box to double the distance for there-and-back journeys.
Why is the real cost sometimes higher?
Quoted economy is measured in ideal conditions. City driving, high speeds, heavy loads, hills, and cold weather all use more fuel, so treat the result as a planning estimate.
Do you store my numbers?
No. Everything is calculated locally in your browser.
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