Fuel Cost Calculator

The Fuel Cost Calculator estimates the total fuel cost for a trip based on distance, vehicle fuel efficiency (MPG or L/100km), and current fuel prices. It helps you budget for road trips, compare the cost of driving vs. flying, and evaluate the fuel savings of different vehicles.

How the Formula Works

Fuel needed = Distance ÷ MPG. Total cost = Fuel needed × Price per gallon. For metric: Fuel (L) = (L/100km × Distance) ÷ 100.

How to Use This Calculator

  1. Enter the trip distance in miles or kilometers
  2. Enter your vehicle's fuel efficiency (MPG or L/100km)
  3. Enter the current fuel price per gallon or liter
  4. View total fuel needed and trip cost

Tips & Best Practices

  • Improving from 15 MPG to 25 MPG saves more fuel than going from 30 MPG to 50 MPG (for the same distance)
  • Highway driving at 55–65 mph is typically the most fuel-efficient speed
  • Proper tire inflation improves fuel efficiency by up to 3%
  • Each extra 100 lbs of cargo reduces MPG by approximately 1%

Important Limitations

  • Actual MPG varies based on driving conditions, terrain, speed, and driving style
  • City vs. highway driving can differ by 20–30% in fuel efficiency
  • Does not include tolls, maintenance, or wear-and-tear costs
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