⛽ Lifestyle

MPG Calculator — Free 2026

Calculate your vehicle's fuel efficiency in MPG, km/L, and L/100km with cost per mile.

Miles Driven Please enter a valid number.

Gallons Used Please enter a valid number.

Total Fuel Cost ($) Please enter a valid number.

Price per Gallon ($) Please enter a valid number.

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Miles per Gallon

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Cost per Mile

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km / Litre

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L / 100 km

How It Works

Enter miles driven
Enter gallons used
Read your results

Understanding Fuel Efficiency

Miles per gallon (MPG) is the standard measure of fuel economy in the United States. It tells you how far your vehicle can travel on one gallon of fuel. A higher MPG means better efficiency and lower fuel costs. This calculator also converts to metric units — km/L and L/100km — used in most other countries.

How MPG Is Calculated

The formula is simple: divide the total miles driven by the gallons consumed. If you know the total fuel cost and the price per gallon, we can derive gallons for you. The cost per mile is the total fuel cost divided by total distance, giving you a practical per-mile expense figure. For planning longer trips, try our fuel cost calculator.

Metric Conversions

To convert MPG to km/L, multiply by 0.425144. To get L/100km (commonly used in Europe and Australia), divide 235.215 by MPG. Lower L/100km values mean better efficiency. For example, a car getting 30 MPG uses about 7.84 litres per 100 kilometres. Need more unit conversions? Check out our unit converter.

Improving Your Fuel Efficiency

Several factors affect MPG: driving speed, tire pressure, vehicle weight, air conditioning use, and driving habits. Maintaining steady speeds on highways, keeping tires properly inflated, and reducing idling time can significantly improve your fuel economy. Tracking your MPG over time helps you spot maintenance issues early.

Frequently Asked Questions

How do I calculate MPG?

Divide the total miles driven by the total gallons of fuel used. For example, 300 miles on 12 gallons gives 25 MPG.

What is a good MPG for a car?

For a modern gasoline car, 25-35 MPG is typical. Hybrids often achieve 40-60 MPG, while trucks and SUVs may get 15-25 MPG. The EPA average for 2025 model year cars is about 27.5 MPG combined.

How do I convert MPG to L/100km?

Divide 235.215 by your MPG value. For example, 25 MPG equals approximately 9.41 L/100km. This calculator does the conversion automatically.

How is cost per mile calculated?

Cost per mile is the total fuel cost divided by total miles driven. Alternatively, divide the price per gallon by your MPG. For example, at $3.50/gallon and 25 MPG, cost per mile is $0.14.