MPG Calculator
Example: 500 km using 40 L = 8.0 L/100km
Track your vehicle's fuel efficiency by entering the miles driven and gallons used. This MPG calculator helps you monitor fuel economy, compare trips, and identify if your car's efficiency is changing over time. Works for gas, diesel, or any fuel type.
Your vehicle vs typical vehicle classes
Fuel Efficiency
Fuel Cost
Liters per 100km
Kilometers per Liter
How We Calculate This
MPG = Miles Driven ÷ Gallons Used. L/100km = 235.215 ÷ MPG. Cost per mile = Gas Price ÷ MPG. UK MPG uses imperial gallons (1 UK gal = 1.2 US gal).
Methodology last reviewed: January 2024. How SparkCalc works
Sources: FuelEconomy.gov (U.S. DOE / EPA): How Vehicles Are Tested · U.S. EPA: Fuel Economy · FuelEconomy.gov: Why Fuel Economy Varies
Frequently Asked Questions
How do I calculate my car's MPG?
Fill up your tank completely. Reset your trip odometer. Drive normally until you need gas again. Fill up completely and note the gallons. Divide miles driven by gallons used.
What is good gas mileage?
It depends on vehicle type. Compact cars: 30-40 MPG. Midsize sedans: 25-35 MPG. SUVs: 20-30 MPG. Trucks: 15-25 MPG. Hybrids: 40-60 MPG.
Why is my MPG lower than the EPA rating?
EPA tests are done in controlled conditions. Real-world factors like city driving, AC use, aggressive acceleration, cold weather, and heavy loads reduce fuel economy.
How do I convert MPG to L/100km?
Divide 235.215 by your MPG. For example, 30 MPG = 235.215 ÷ 30 = 7.84 L/100km. Lower L/100km is more efficient.
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