# Gas Mileage Calculator

## Calculator Use

Calculate fuel economy in automobiles in US or Metric units. 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). Equivalent fuel economy/efficiency ratings are 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 gas mileage by odometer readings: enter your starting and ending odometer readings and the amount of fuel used for the trip.
- Trip Distance
- Calculate gas mileage using trip distance: enter total distance and the amount of fuel used for the trip.
- Price per Gallon or Liter
- Enter the fuel price per gallon or per liter and the calculator will calculate:

-Fuel Rate - fuel cost per mile or kilometer

-Fuel Total - the total spent on fuel for the 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 cost based on your total distance.

## How to Calculate Miles per Gallon or Kilometers per Liter

When you calculate miles/gallon (mpg) or kilometers/liter (km/l) you are calculating fuel economy in terms of distance per unit volume or distance/volume. 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.

If you track your gas usage you can evaluate your vehicle's fuel economy. This is how to calculate your mpg or your km/l yourself.

- 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.
- Record the trip starting odometer reading at the time you fill up.
- At the end of your trip or week, fill up your tank again.
- Record the number of gallons or liters required to fill the tank once again. This is the total number of gallons or liters you used for the trip (or the time period).
- Record the trip ending odometer reading (this might also be the starting reading for your next trip).

- Calculate your actual miles or kilometers
- Ending Odometer Reading minus Starting Odometer Reading equals miles or kilometers traveled
- End - Start = Miles or Kilometers traveled

- Calculate your rate of gas usage ( mpg or km/l )
- Miles driven ÷ gallons used = miles per gallon = mpg
- Kilometers driven ÷ liters used = kilometers per liter = 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, or fuel consumption rate.

- Fill up your tank with fuel before you start a long trip or the block of time you want to track.
- Record the trip starting odometer reading at the time you fill up.
- At the end of your trip, fill up your tank again.
- Record the number of liters required to fill the tank. This is the total number of liters you used for the trip.
- Record the trip ending odometer reading (this might also be the starting reading for your next trip).

- Calculate your actual kilometers
- Ending Odometer Reading minus Starting Odometer Reading equals total kilometers
- End - Start = Kilometers

- Calculate your rate of fuel usage (l/100km)
- 100 * liters used ÷ kilometers driven = liters per 100 kilometers = l/100km

**Cite this content, page or calculator as:**

Furey, Edward "Gas Mileage Calculator"; from *https://www.calculatorsoup.com* - Online Calculator Resource.