Fuel Cost Calculator
Calculate fuel costs for any trip based on distance, fuel efficiency, and gas price. Supports miles/km, multi-trip comparison, and round trips.
Trip Details
About Fuel Cost Calculator
This fuel cost calculator helps you estimate how much you will spend on gas or fuel for any trip. Enter your trip distance, vehicle fuel efficiency, and the current fuel price to get an instant breakdown of fuel needed and total cost.
Imperial and Metric Support
Toggle between Imperial units (miles, gallons, MPG) and Metric units (kilometers, liters, L/100km) to match your region. All conversions are handled automatically, so you can plan trips regardless of which measurement system you prefer.
Multi-Trip Comparison
Add multiple trips to compare fuel costs side by side. Each trip can have its own distance, fuel efficiency, and fuel price. The calculator shows individual results for every trip plus a combined total cost, making it easy to budget for multi-stop road trips or compare different routes.
Round Trip and Cost Per Mile
Enable the round trip option to automatically double your distance, giving you the full cost of a return journey. The calculator also breaks down your expense to a cost per mile or cost per kilometer figure, which is useful for mileage reimbursement, expense reports, or understanding daily commute costs.
Common Use Cases
- Planning road trip budgets and estimating fuel stops
- Calculating daily or weekly commute costs
- Comparing fuel expenses for different vehicles
- Determining cost per mile for business mileage reimbursement
- Budgeting for multi-leg trips with varying fuel prices
All calculations are performed in your browser. No data is stored or transmitted.
Frequently Asked Questions
How do I calculate fuel cost for a road trip?
Divide the total trip distance by your vehicle's fuel efficiency (MPG or km/L), then multiply the result by the current fuel price per gallon or liter. For example, a 300-mile trip in a car averaging 30 MPG with gas at $3.50/gallon would need 10 gallons, costing $35.00.
What is the difference between MPG and L/100km?
MPG (miles per gallon) is used in the US and UK, where higher numbers mean better efficiency. L/100km (liters per 100 kilometers) is the metric standard used in most other countries, where lower numbers indicate better efficiency. A car getting 30 MPG is roughly equivalent to 7.84 L/100km.
How does the round trip option work?
Enabling the round trip toggle doubles the distance for your calculation. This is useful when planning a trip where you need to drive back the same route, so you can see the total fuel cost for both directions at once.
Can I compare fuel costs for multiple trips?
Yes. Use the multi-trip feature to add several trips with different distances, fuel efficiencies, and prices. The calculator shows individual costs for each trip plus a combined total, which is helpful for planning a multi-stop road trip or comparing commute routes.
How can I improve my vehicle's fuel efficiency?
Maintain proper tire pressure, drive at moderate speeds, avoid aggressive acceleration and braking, remove excess weight from the vehicle, use cruise control on highways, keep the engine properly maintained, and combine short trips when possible.