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Fuel & Trip Cost Calculator

Calculate total driving expenses and fuel costs for any road trip. Supports dual distance units (miles & km), multiple fuel economy standards (US MPG, Imperial UK MPG, L/100km, km/L), fuel price per gallon/liter, round trip doubling, highway tolls, parking fees, passenger cost splitting, and estimated CO2 emissions.

Your inputs are calculated locally in your browser. No personal data is sent across the network.
Vehicle Efficiency Benchmarks:

Trip & Fuel Parameters

miles
Round Trip (Double Distance)
MPG US
$
per gallon
$
$
Split among passengers1 person
Total Trip Cost
$32.59
One-Way Total
Per Person (1)
$32.59
Fuel: $32.59
Fuel Needed
8.93 gal
33.8 Liters
Cost / Mile
$0.130
$0.081 / km

Complete Trip Breakdown

Route & Efficiency
Effective Distance:250 miles (402.34 km)
Trip Direction:One-Way
Vehicle Consumption:28 MPG_US
Cost Allocation
Fuel Expenses:$32.59
Tolls & Extra Fees:$0.00
Per Passenger Share:$32.59
🌱
Estimated Carbon Footprint
~78.1 kg CO₂ emitted (total)
Offset: ~4 tree-years
Tips for Estimating Trip Fuel Costs

Highway driving typically yields 15% to 25% higher fuel economy than stop-and-go city driving. Heavy vehicle cargo, luggage racks, and aggressive acceleration can increase fuel consumption by 10% to 20%.

How to use this tool

1Step 1

Enter your trip distance in miles or kilometers, with optional round trip toggle.

2Step 2

Choose a vehicle preset or enter your vehicle's fuel efficiency (MPG or L/100km).

3Step 3

Enter the current fuel price per gallon or liter.

4Step 4

Optionally add highway tolls, parking fees, and adjust passenger split count.

5Step 5

View instant total trip cost, fuel required, cost per person, and export summary.

Frequently asked questions

How do you calculate fuel cost for a road trip?

Divide total trip distance by your vehicle's fuel efficiency (e.g., 300 miles / 30 MPG = 10 gallons required), then multiply by the price per gallon (e.g., 10 gallons × $3.50/gal = $35.00 total fuel cost).

How does round trip affect the calculation?

Enabling the round trip toggle automatically doubles your one-way distance, total fuel required, and driving costs.

Can I convert between MPG and Liters per 100km?

Yes. The calculator supports US MPG, Imperial UK MPG, L/100km, and km/L. Switching units automatically converts distances and pricing standards.

How is the passenger cost split calculated?

Total trip cost (fuel plus tolls and parking fees) is divided equally among the configured number of passengers.

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