Fuel Cost Calculator

Fuel cost estimation requires three inputs: distance, fuel efficiency, and fuel price. For a 500-kilometer road trip in a car averaging 8 liters per 100km with fuel at $1.50 per liter, the cost is (500 ÷ 100) × 8 × $1.50 = $60. The US uses miles per gallon (MPG) instead of liters per 100km, making direct comparison confusing. A car rated at 30 MPG is equivalent to 7.84 L/100km — the conversion is 235.215 ÷ MPG. Highway driving is typically 10-20% more fuel-efficient than city driving due to steady speeds and less braking. A car rated at 28 city / 36 highway MPG uses about 22% less fuel on the highway. This calculator supports both metric and imperial units, handles mixed city/highway driving ratios, and computes costs for one-way and round trips. Compare driving costs against flight prices or train tickets to make informed travel decisions. Fuel prices vary significantly — from $0.02/liter in Venezuela to over $2.50/liter in Hong Kong — so always use your local price for accurate results.

Small driving habit changes can reduce fuel consumption by 15-30%. Aggressive acceleration and hard braking can increase fuel use by up to 33% on highways and 5% in city driving. Maintaining a steady speed of 90-100 km/h (55-65 mph) on highways is the sweet spot for most vehicles — fuel consumption increases roughly 1% for every 1.6 km/h above 90. Tire pressure matters: underinflated tires by 10 PSI can reduce efficiency by 3-4%. Extra weight costs fuel too — every 45kg (100 lbs) of unnecessary cargo reduces MPG by about 1% for average cars and 2% for smaller vehicles. Air conditioning typically uses 5-10% more fuel than windows-up driving at city speeds, but at highway speeds (above 80 km/h), open windows create enough drag to exceed the AC penalty. Roof racks add 2-8% to fuel consumption even when empty due to aerodynamic drag. Calculate your current costs with this tool, then estimate savings from improving habits — the math often motivates real changes.