MPG Calculator

Created by Mateusz Mucha and James Mathison
Reviewed by Bogna Szyk and Jack Bowater
Last updated: Dec 14, 2022

This MPG calculator (a.k.a, miles per gallon calculator) is a helpful tool that allows you to calculate your fuel consumption. When you plan a trip, you'll probably want to know how much it will cost before you set off. That is not the only use of this MPG calculator; maybe you're curious about your gas mileage over a particular distance. If you are interested in either of these topics, then you no longer need to fret about calculations. This fuel efficiency calculator will estimate it for you instantaneously!

In the rest of the article, you will discover:

  • What gas mileage is; and
  • How to use the fuel efficiency calculator.

Want to check how your gas weighs compared to water? Our api gravity calculator is here to assist you!

What is gas mileage?

Gas mileage is the relationship between the distance you've traveled and the amount of fuel you have burnt. Your gas consumption depends on a range of factors. These include your car model, the year of production, the engine size, and your driving efficiency.

For example, the average gas mileage of Ford Focus 1.6 produced between 1998 and 2005 amounts to 7.61/100 km. It's crucial to know the fuel consumption of your car. Otherwise, you will not be able to estimate how much petrol you need to cover a particular distance.

If you're leasing a car, there's more to worry about than just fuel efficiency – you may need to worry about the cost of exceeding your lease mileage! Fret not - our lease mileage calculator will help you keep track of this!

You can calculate the fuel efficiency with the following formula (imperial):

MPG = distance (miles) / average gas consumption (gallons)

In the metric system, the formula is:

MPG = distance (km) x average gas consumption (litres) / 100 km

However, it's much easier to use the MPG calculator.

How to use the fuel efficiency calculator?

The fuel efficiency calculator estimates gas mileage based on the number of kilometers covered and the average fuel consumption of your car.

All you need to do is input:

  1. Distance – how far you plan to travel.
  2. Fuel economy – the average fuel use of your car.

In the advanced mode, you can also enter:

  1. Price of petrol.

Then the MPG calculator will estimate the total amount of fuel you will need for the whole route. The advanced version will determine the total cost of your tour as well.

If you want to share the cost between a few people, you may find our gas estimator useful. This tool automatically divides the total cost between the number of people who will pay for it.

If you don't know the average fuel use of your car in liters, just click on the unit to change it. You can also easily convert it with our fuel economy converter. This tool operates with three different units:

  • Miles per US gallon
  • Miles per UK gallon
  • Liters per 100km

As you can see, the MPG calculator is very useful for everyone who wants to plan a car trip. This application may save both time and money.


How many gallons does my car hold?

12 to 16 gallons, depending on the size of your car. Small compact cars will tend to have a 12-gallon fuel tank, while larger cars can have up to 16 gallons. The owner's manual for the vehicle is the best place to check.

How does a car calculate average mpg?

In modern cars, the engine control knows how much fuel the engine has consumed and how many miles the vehicle has traveled. By dividing the distance in miles by the amount of fuel in gallons, the car can display the average mpg (miles per gallon).

How do I calculate mpg?

To calculate the mpg of your car:

  1. Record how many miles the car travels.
  2. Find out how many gallons of fuel the car used to travel this distance.
  3. Divide the distance in miles by the fuel amount in gallons.
  4. The result is the mpg of your car for that trip.

How much gas to drive 300 miles?

12 gallons. This outcome assumes that your car has the United States average mpg of 25 miles per gallon. To calculate the result, divide 300 miles by 25 mpg, which equals 12 gallons.

What affects mpg?

Factors that can negatively affect the mpg you'll get while driving include:

  • Driving aggressively (fast acceleration, braking, and high speeds);
  • Cold weather driving, as the engine is most efficient at a specific operating temperature;
  • Towing a trailer or a roof rack – extra weight takes more energy to move;
  • Air conditioning; and
  • Four-wheel-drive rather than two-wheel-drive operation.
Mateusz Mucha and James Mathison
Fuel used
US gal
Fuel economy
US mpg
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