Fuel Cost Calculator
Calculate your trip fuel costs instantly. Support for both US (MPG) and metric (L/100km) systems. Perfect for planning road trips and budgeting fuel expenses.
Instant Calculation
Calculate fuel costs instantly with accurate formulas for both US and metric systems.
Budget Planning
Plan your trip budget with accurate fuel cost estimates for road trips.
100% Private
All calculations happen in your browser. Your data never leaves your device.
How to Use
Select Unit System
Choose between US (miles/MPG) or Metric (km/L/100km) systems based on your location.
Enter Trip Details
Input your trip distance, vehicle's fuel efficiency, and current fuel price.
Optional: Round Trip
Check the round trip box if calculating fuel for both outbound and return journeys.
Get Results
Click calculate to see the fuel needed and total cost for your trip.
Frequently Asked Questions
How do I calculate fuel cost for a trip?
Enter your trip distance, vehicle's fuel efficiency, and current fuel price. The calculator will instantly show you the fuel needed and total cost. Use the unit toggle to switch between US (miles/MPG) and metric (km/L/100km) systems.
What's the difference between MPG and L/100km?
MPG (Miles Per Gallon) is used in the US and measures how many miles you can travel per gallon. L/100km (Liters per 100 kilometers) is used in most other countries and measures fuel consumption per 100km. Lower L/100km is better, while higher MPG is better.
Can I calculate round trip costs?
Yes! Check the 'Round Trip' checkbox to automatically double your distance, accounting for both outbound and return journeys.
How accurate is this calculator?
The calculator uses standard fuel consumption formulas that are mathematically accurate. However, actual fuel costs may vary based on driving conditions, vehicle condition, driving habits, and real-time fuel price changes. Use this as an estimate for planning purposes.
Is my data private?
Yes! All calculations happen in your browser. Your data is never sent to any server, ensuring complete privacy and security.
What if I don't know my car's fuel efficiency?
Check your vehicle's owner manual or look at recent fill-up records to determine average fuel efficiency. You can also check EPA estimates or your car's onboard computer if available. For more accurate results, calculate based on (miles or km driven) ÷ (gallons or liters used).