Calculate MPG, km/L, or L/100km fuel efficiency, estimate fuel costs, and track your vehicle's performance
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Track your car's gas mileage to understand its fuel efficiency and costs. Our calculator works with US units (MPG), metric units (km/L), or European standard (L/100km). Calculate trip costs, compare to vehicle averages, and estimate your annual fuel expenses.
Fuel efficiency can be expressed as MPG (miles per gallon), km/L (kilometers per liter), or L/100km (liters per 100 kilometers). Higher MPG or km/L means better efficiency. Lower L/100km means better efficiency. Our calculator converts between all formats for easy comparison.
Fuel Efficiency Formula
Calculate fuel costs for road trips and plan your travel budget.
Track MPG over time to catch maintenance issues early.
Monitor monthly and annual fuel spending for budgeting.
Compare fuel efficiency between vehicles when car shopping.
Monitor your vehicle's fuel efficiency over time
Detect problems early if mileage suddenly drops
Calculate actual cost per mile/kilometer
Compare different driving conditions or routes
Budget accurately for fuel expenses
It depends on vehicle type. Hybrids: 45-55 MPG. Compact cars: 30-35 MPG. Midsize sedans: 25-30 MPG. SUVs: 20-25 MPG. Trucks: 18-22 MPG. Compare to your vehicle's EPA rating for a better benchmark.
EPA ratings are measured in controlled conditions. Real-world factors that reduce mileage include: city vs highway driving, aggressive acceleration, cold weather, air conditioning, low tire pressure, and extra weight.
The formula is: L/100km = 235.215 ÷ MPG. For example, 30 MPG = 7.84 L/100km. Our calculator does this conversion automatically.
UK gallons are larger than US gallons (4.55L vs 3.79L). The same vehicle gets higher UK MPG numbers. To convert: UK MPG = US MPG × 1.2. Our calculator shows both.
Maintain proper tire pressure, remove excess weight, avoid aggressive driving, use cruise control on highways, reduce idling, keep up with maintenance, and combine short trips.
This tool measures your car's fuel efficiency (MPG, km/L, L/100km) from the distance driven and fuel used, then shows a secondary cost per mile at that efficiency. To estimate the total gas cost of a specific trip, use our Fuel Cost Calculator instead.