Fuel Cost Calculator
Free online fuel cost calculator. Estimate trip fuel cost and consumption with metric and imperial units. Calculate cost per mile or km for any vehicle.
How Fuel Efficiency Works
Fuel efficiency is measured as miles per gallon (MPG) or liters per 100 kilometers (L/100km). MPG is calculated by dividing distance traveled by fuel consumed. Higher MPG means better efficiency and lower costs.
Improving Fuel Efficiency
Keep your vehicle well-maintained, maintain proper tire pressure, reduce weight, minimize idling, drive smoothly without rapid acceleration, and maintain consistent highway speeds. These practices can improve MPG by 5–15%.
Highway vs City Driving
Highway driving is typically more efficient (25–35 MPG) than city driving (15–25 MPG) due to constant speed and less braking. Your actual efficiency depends on driving conditions and habits.
CO₂ Emissions from Fuel
Burning one gallon of gasoline produces approximately 8.89 kg of CO₂, while one liter produces about 2.35 kg. Electric vehicles produce zero direct emissions, making them environmentally superior for long-term use.
Monthly Fuel Cost
The monthly cost is calculated as: Trip Cost × Times per Week × 4.33 weeks/month. This helps you budget regular commutes or frequent errands.
FAQs
What's considered good fuel economy?
For gasoline cars, 25+ MPG is good, 30+ is excellent. Trucks typically get 15–20 MPG. In metric, below 7 L/100km is good.
Does A/C use more fuel?
Running air conditioning reduces fuel efficiency by 3–5%. At highway speeds, A/C impact is less than opening windows which creates aerodynamic drag.
How do I convert between MPG and L/100km?
Formula: L/100km = 235.214 / MPG. Or: MPG = 235.214 / L/100km. Use the toggle buttons in this calculator to switch automatically.