Gas Mileage (MPG) Calculator

Want to know your car's real MPG? Our Gas Mileage Calculator makes it simple! Simply enter the miles driven and gallons used to view your fuel efficiency. Track costs, compare trips, and save money on gas.

Share Calculator

Calculating Miles Per Gallon (MPG):

Miles per gallon (MPG) is the most commonly used measure of gasoline mileage. It shows us how far a gallon of gasoline can take your car. You can use the following technique to calculate your MPG yourself:
MPG = miles traveled/gallons of gas used
Measurement Method
Comparatively, there are more indicators as to how efficiently your car is performing on fuel. It's not some incredibly high-tech information that can only be discerned by checking some obscure figure at the next gas station.
Gas Mileage (MPG) in a Nutshell: MPG refers to miles per gallon, hence the capacity that a car's petrol tank has to power the car in terms of distance. This one informs us of the distance that one can cover in a certain number of miles, in our case, the car, in terms of how many gallons of fuel it will utilize.
The higher the value of a car's MPG, the better the gas mileage of our vehicle. Small and energy-efficient cars offer greater fuel economy and result in more miles per gallon, which is cheaper at the pump.
Calculating Your Vehicle's MPG: It's easier than you think.
Try this the next time you fill up your tank:
Reset your trip odometer to zero. This little counter on your dashboard keeps track of how many miles you have left since the reset.
Fill your gas tank full.
Drive as usual. Check your driving mileage before refueling.
Fill your tank again. Decide how many gallons it will take to fill the tank this time.

Gas Mileage (MPG) Calculation Formula

Calculating gas mileage is super simple, and you don't need to be a math genius to do it. The formula is:
MPG = Total Miles Driven ÷ Total Gallons of Fuel Used

Want to find out the gas mileage of your car? To find out the gas mileage of your car, you just need to know the distance you drove and how much petrol you used. You can calculate it manually using the formula given here:
Fill up your gas tank completely and note the odometer reading (or reset your trip odometer to zero).
Drive as you normally would until you need to refuel.
Fill up the tank again and write down how many gallons it took to fill it up.
Check the odometer to see how many miles you drove since the last fill-up.
Plug the numbers into the formula: Divide the miles driven by the gallons used.
This gives you your car's MPG for that particular trip or time frame. Also, remember that your MPG can vary based on, as an example, heavy traffic, driving pattern, or whether you often have additional weight inside the automobile.

Gas Mileage (MPG) Calculation Example

Let's use an example to make this tangible. Consider yourself commuting to school and around town in your mother's SUV. Here's how to figure out the MPG:
After filling up the tank, you set the trip odometer to zero.
You've traveled 200 miles after a week of driving to practice, school, and possibly a quick stop for ice cream.
It takes ten gallons to fill the tank up again.
Enter those figures into the formula now:
MPG = 200 miles ÷ 10 gallons = 20 MPG
So, the SUV gets 20 miles per gallon. If gas costs $3.50 per gallon, you can also figure out how much it costs to drive those 200 miles:
Cost = 10 gallons × $3.50 per gallon = $35
This illustration demonstrates the importance of MPG since a lower MPG results in higher gas costs for the same distance traveled. You would only need roughly 6.67 gallons for those 200 miles if your car had 30 mpg, which would come to about $23.35. That is a significant difference!

Example 2.

Let's say you drove 300 miles and used 10 gallons of gas:

Your car's gas mileage is 30 MPG!
What If You Use Kilometers & Liters?
If you use the metric system (km/L), the formula is:

Improving Gas Mileage

For a comparison of fuel efficiency by type of car, please go to fueleconomy.gov/feg/bestworst.shtml. There are many factors relevant to fuel economy, and there are things that you have to keep in mind to gain better fuel economy.
1. Routine maintenance: Tire replacement, air filter cleaning, and oil changes regularly may all significantly increase fuel efficiency.
2. Use a gentle vehicle. Avoid hard acceleration, sudden braking, and speeding. Maintain speed whenever possible.
3. Reduce weight: Remove unnecessary items from your car, as lighter items improve fuel efficiency.
4. Using Cruise Control: Constant speed highways require the use of cruise control, hence increasing the efficiency of the vehicle or the engine.
5. Reduce commuting: Do not drive for several hours at a stretch because that may consume fuel without covering any ground.

Common MPG Questions (FAQ)

Q. What's a good MPG for a car?
20-30 MPG = Average
30-40 MPG = Good
40+ MPG = Excellent

Q. Does AC affect gas mileage?
Yes! Using AC can reduce MPG by 5-10%. At low speeds, open windows instead.

Q. Why is my MPG dropping suddenly?
Possible reasons:
Underinflated tires, Dirty air filter, Engine problems, Heavy loads