Fuel Mileage Calculator to Calculate
and Compare Car Gas Mileage
This free online Fuel Mileage Calculator will calculate MPG and associated daily, monthly, and annual gas expenses for your car. Plus it also gives you the ability to compare car gas mileage expenses with other MPG ratings to see how much you could save by switching to a car with better fuel economy.
Unlike other online gas mileage calculators, the fuel mileage calculator on this page will also calculate your lifetime gas expenses based on your car's MPG rating and on how many miles you drive your car per year. You'll be amazed not only by how gas expenses can pile up over your lifetime, but also by what a big difference it can make by switching to a car that gets just a few more miles per gallon of gasoline.
If you would like to estimate the cost per mile that includes all costs associated to buying and owning a vehicle (gas expense plus tax, license, finance charges, depreciation, insurance, maintenance, repairs, etc.), be sure to visit the Car Buying Calculator.
The Price of Gas is NOT the Reason for High Gas Expenses
I always have to chuckle when I overhear someone complaining about the price of gas, especially when they are doing so while leaning over the hood of their idling SUV that has a low tire on the right-front, having just stopped by the coffee shop for a $3, 12-ounce cup of designer coffee while on their way home from fighting stop-and-go rush hour traffic, and are now parked in out-of-the-way grocery store to pick up a loaf of bread.
First off, why aren't they complaining about the $32-per-gallon cup of designer coffee they are holding in their hands?!
Secondly, if they are so concerned about the cost of gasoline, why are they driving a gas guzzling SUV?
Thirdly, why didn't they buy more bread the last time they made a special trip to the grocery store?
Why don't they take a minute to air up that low tire?
And finally, why have they chosen to work at a job that forces them to drive during the most fuel-sucking time of the day?
My point is, the price of gasoline is only a tiny part of the gasoline expense equation. More important factors include: the MPG rating of the vehicle you drive, the conditions under which you drive your vehicle, the planning needed to avoid unnecessary trips, and having the freedom to choose when to commute and how (walk, bike, carpool, or public transportation).
How to Calculate Gas Mileage
Before using the fuel mileage calculator, you will first need to log the data you will need to enter into the calculator (or that you will need to manually calculate MPG) as detailed below:
- The next time you visit the gas station to refill your car's gas tank (the less fuel you have in your tank the better), write down the odometer reading (beginning reading).
- On your return trip to the gas station to refill your car's gas tank, write down the odometer reading (ending reading) and the number of gallons it took to refill the tank.
If you want to calculate MPG yourself, here is the formula:
Of course, now that you have discovered this page you don't need to know how to calculate gas mileage. All you need to do is plug in the numbers and click the "Calculate Fuel Mileage" button.
With that, let's use the Fuel Mileage Calculator to calculate MPG and periodic gasoline expenses for your car, and to compare car gas mileage expenses generated by your entries with higher MPG ratings.
Fuel Mileage Calculator Glossary of Terms
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Beginning odometer reading: If you have not done so already, record the odometer reading the next time you fill up the gas tank on your car. This is the beginning odometer reading you will need to enter on this line.
Ending odometer reading: Once you have a beginning odometer reading, the next step is to record the odometer reading when you go to refill your tank. This is the ending odometer reading you will need to enter on this line.
Number of gallons pumped this fill: The number of gallons of gas it took to refill the gas tank on your car. Be sure to include the decimal portion of the gallons meter on the gas pump.
Price of one gallon of gasoline: The current price of one gallon of gasoline. The fuel mileage calculator will use this figure to calculate your periodic fuel expenses.
Average number of miles driven per: First select the mileage time period for which you know the average number of miles you drive your car (day, week, month, or year). Then enter the average number of miles for the selected time period. The fuel mileage calculator will use this figure to calculate your periodic fuel expenses.
Number of years to calculate lifetime costs: The number of years you would like the fuel mileage calculator to calculate lifetime fuel expenses for. The purpose of this entry is to show you how gas expenses add up over the course of your lifetime, and how switching to a car with even a slightly higher MPG can result in significant lifetime savings.
Expected percent return on investments: The annual percentage return you would expect to earn on your investments. Enter as a percentage (for .06, enter 6%). The fuel mileage calculator will use this figure to estimate what would happen if you invested the gas expense savings realized by switching to a vehicle with a higher mpg rating.
Miles per gallon result row: The first column will show the calculated miles per gallon (MPG) based on your odometer and gasoline entries. In the second column you will find a drop-down menu containing alternative mpg ratings you can use to compare car gas mileage expenses at your current MPG with those available in the selection box. If you have the upper portion of the calculator completed, changing the selected MPG will automatically recalculate the results. NOTE: In order for the fuel mileage calculator to calculate results for the Savings column, the selected Compare MPG must be greater the Current MPG.
Daily fuel expense: Based on your entries, this row contains your daily fuel expense for the Current MPG and the Compare MPG columns. The last column will show the daily savings of a higher MPG if one is selected in the Compare MPG drop down menu.
Monthly fuel expense: Based on your entries, this row contains your monthly fuel expense for the Current MPG and the Compare MPG columns. The last column will show the monthly savings of a higher MPG if one is selected in the Compare MPG drop down menu.
Annual fuel expense: Based on your entries, this row contains your annual fuel expense for the Current MPG and the Compare MPG columns. The last column will show the annual savings of a higher MPG if one is selected in the Compare MPG drop down menu.
Lifetime fuel expense: Based on your entries, this row contains your lifetime fuel expense for the Current MPG and the Compare MPG columns. The last column will show the lifetime savings of a higher MPG if one is selected in the Compare MPG drop down menu.
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