Gas Mileage Calculator

Gas Mileage
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Trip Distance
Miles
Gallons of Fuel
Optional Cost Calculations
Trip: miles
Fuel: gallons
MPG US:
MPG US = miles per US gallon

Calculator Use

Calculate vehicle Fuel Economy in MPG US (miles per US gallon), MPG Imp. (miles per Imperial gallon), km/L (kilometers per liter) or Fuel Consumption in L/100km (liters per 100 kilometers).  Equivelant fuel economy/efficiency ratings will be converted and shown for all units, MPG US, MPG Imp, km/L and L/100km.

  • MPG = miles per gallon
  • MPG US = miles per United States gallon
  • MPG Imp = miles per Imperial gallon
  • km/L = kilometers per liter
  • L/100km = liters per 100 kilometers
Odometer Readings
Calculate by odometer readings by entering your trip starting and ending odometer readings and the amount of fuel used for the trip
Trip Distance
If you know your total trip distance in miles or kilometers you can calculate fuel economy entering total distance and the amount of fuel used for the trip
Price per Gallon or Liter
Enter the cost of fuel per gallon or per liter and the calculator will calculate Fuel Rate: fuel cost per mile or kilometer and, Trip Total: the total spent on fuel for this trip
Price per Mile or Kilometer
Enter the cost per mile or kilometer. This might be the cost of a rental or the amount you can deduct on taxes.  The calculator will calculate your trip total based on your total distance.

How to Calculate Miles per Gallon or Kilometers per Liter

When you calculate miles/gallon (mi/gal) or kilometers/liter (km/L), in both cases you are calculating distance per unit volume or distance/volume, the fuel economy.  Therefore, the following outline is generally applicable to both calculations.  When you calculate liters per 100 kilometers (L/100km) you are calculating volume per 100 units of distance; see calculation below.

Want to track your gas usage to see if you are getting the best miles per gallon or kilometers per liter you can out of your car? Here is the way you can calculate your MPG or your km/L yourself.

  1. Fill up your tank with fuel before you start a long trip or the block of time you want to track. For example, you may just want to track your weekly gas usage rate.
  2. Record the trip starting odometer reading at the time you fill up.
  3. At the end of your trip or week, fill up your tank
    • Record the number of gallons or liters to fill up.  This is the number of gallons or liters you used for the trip that is now ended.
    • Record the trip ending odometer reading (this might also be the starting reading for your next trip)
  4. Calculate your actual miles or kilometers
    • Ending Odometer Reading minus Starting Odometer Reading equals miles or kilometers
    • End - Start = Miles or Kilometers
  5. Calculate your rate of gas usage ( MPG or km/L )
    • Miles driven divided by gallons used equals miles per gallon and equals mi/gal and equals MPG.
    • Kilometers driven divided by liters used equals kilometers per liter and equals km/L

Gas Rate (or Fuel Rate)

What is it costing you in gas per mile?  Enter the price per gallon.  Gas rate = price per gallon divided by miles per gallon = price per mile.

What is it costing you in fuel per kilometer?  Enter the price per liter.  Fuel rate = price per liter divided by kilometers per liter = price per kilometer.

Mileage Rate (or Kilometer Rate)

Enter a price per mile or price per kilometer to calculate the total charge incurred on this trip.  This may be helpful for expense, tax deductions or lease related calculations; in some situations you will be given or allowed a cost per unit mile or kilometer to cover the expense of using a vehicle.

How to Calculate Liters per Kilometers (L/100km)

When you calculate liters per 100 kilometers (L/100km) you are calculating volume per 100 units of distance, the fuel consumption.

  1. Fill up your tank with fuel before you start a long trip or the block of time you want to track.
  2. Record the trip starting odometer reading at the time you fill up.
  3. At the end of your trip, fill up your tank
    • Record the number of liters to fill up.  This is the number of liters you used for the trip that is now ended.
    • Record the trip ending odometer reading (this might also be the starting reading for your next trip)
  4. Calculate your actual kilometers
    • Ending Odometer Reading minus Starting Odometer Reading equals total kilometers
    • End - Start = Kilometers
  5. Calculate your rate of fuel usage (L/100km)
    • 100 time liters used divided by kilometers driven equals liters per 100 kilometers and equals L/100km.
 

Cite this content, page or calculator as:

Furey, Edward "Gas Mileage Calculator" From http://www.CalculatorSoup.com - Online Calculator Resource.