The MPG Calculator measures how efficiently your vehicle uses fuel by calculating Miles Per Gallon from a trip's distance and fuel consumption. Enter your distance traveled, fuel consumed, and gas price per unit — then select your preferred units (miles or kilometers, gallons or liters) — to see your MPG, fuel efficiency in L/100km, total trip fuel cost, and cost per mile.
Miles Per Gallon (MPG)
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Fuel Efficiency (L/100km)
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Trip Fuel Cost
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Cost Per Mile
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Gas mileage, measured in miles per gallon (MPG), is the relationship between distance traveled and fuel consumed. It indicates how many miles your vehicle can travel on one gallon of fuel, helping you understand your car's fuel efficiency.
To calculate MPG, divide the distance traveled (in miles) by the amount of fuel consumed (in gallons). For example, if you drove 300 miles and used 12 gallons of gas, your MPG would be 300 ÷ 12 = 25 MPG.
Several factors affect MPG including vehicle type, engine size, driving habits, road conditions, weather, tire pressure, and vehicle maintenance. Highway driving typically yields better MPG than city driving due to consistent speeds.
Modern cars use onboard computers that monitor fuel flow and distance traveled to calculate real-time MPG. The system tracks fuel injector activity and odometer readings to provide continuous fuel efficiency estimates.
The amount of gas needed depends on your vehicle's MPG. If your car gets 25 MPG, you'd need 12 gallons (300 miles ÷ 25 MPG = 12 gallons). Use our calculator to determine your specific fuel requirements.
Good gas mileage varies by vehicle type. Compact cars achieving 30+ MPG are considered efficient, while SUVs and trucks getting 20-25 MPG are respectable. Hybrid vehicles often exceed 40 MPG, and electric vehicles eliminate gas consumption entirely.
Improve MPG by maintaining steady speeds, keeping tires properly inflated, removing excess weight, combining errands into one trip, using cruise control on highways, and keeping up with regular vehicle maintenance like oil changes and air filter replacements.
Both are valid measurements. MPG (miles per gallon) is common in the US, while L/100km (liters per 100 kilometers) is used internationally. L/100km is often preferred because lower numbers indicate better efficiency, making comparisons more intuitive.