Gas Mileage Calculator (2024)

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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)

Entera 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 kilometerto 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" at https://www.calculatorsoup.com/calculators/tools/gas-mileage-calculator.php from CalculatorSoup, https://www.calculatorsoup.com - Online Calculators

Last updated: October 7, 2023

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FAQs

How do I calculate gas mileage? ›

The easiest way to calculate your gas mileage is to simply divide the number of miles traveled by the number of gallons of gas your vehicle took to refill. In sum, that's miles driven divided by gallons of gas used.

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How do I calculate the gas cost for a trip? ›

Calculate the overall gas cost of your trip

First, divide the distance of the route by your miles per gallon figure to discover how many gallons of gas you will need, then multiply the number of gallons by the price of gas.

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How many gallons of gas per 100 miles? ›

Say your car or truck is rated at 18 mpg. Take the reciprocal of 18 by dividing one by 18 and get 0.055, which is gallons per mile. Then multiply by 100 by moving the decimal point two places to the left, and you'll get 5.5 gallons/100 miles.

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How many miles is 1 gallon of gas? ›

Most gasoline sedans sold to the general public not for racing and luxury use would get between 18 and 35 mpg with normal driving not wasting gasoline, That's a measure we call fuel economy, in the US we measure it as miles per gallon.

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How do I calculate my gas? ›

Fuel Cost = (Distance / Fuel Efficiency) * Fuel Price

Fuel Price is the cost of one gallon of fuel. To calculate the fuel cost, you divide the distance by the fuel efficiency to determine the total number of gallons of fuel consumed. Then, you multiply that by the fuel price to obtain the total fuel cost.

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What is the formula for mileage? ›

Mileage (MPG or L/100km) = (Total Distance Travelled) / (Total Fuel Consumed) For MPG: Mileage (MPG) = (Odometer Reading at Refill 2 – Odometer Reading at Refill 1) / Fuel Added. For L/100km: Mileage (L/100km) = (Fuel Added / Total Distance Travelled) * 100.

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How do you calculate cost per mile? ›

Calculating cost per mile becomes a simple equation once you know your mileage and total expenses. Divide your total expenses by the total number of miles driven, and the result is your cost per mile. For example, the USPS drives 1.2 billion miles every year, with annual costs totaling $82.2 billion.

Is there an app to calculate gas for a trip? ›

Roadtrip shows costs based on current gas prices, fuel economy, mileage & vehicle type (car, truck, or motorcycle). Easily split costs with friends, see carbon emissions, compare routes for savings, & choose the best car for your trip.

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How many miles does $15 of gas get you? ›

With $15 of gas money, assuming the current price for gasoline is $3.25 per gallon and your car gets an average of 27 miles per gallon, you can travel roughly 125 miles.

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How to calculate fuel cost? ›

Thus, the mileage of the car is 510/30 = 17 km/l. So, if Ramesh has to plan his next trip of 340 Km and the cost of the petrol is Rs. 120/litre, he can estimate the cost using the fuel cost calculator as (340/17) *120= 2400 INR, so he will keep aside a provision of Rs. 2400 for the cost of fuel during the trip.

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How much is 30 miles in gas? ›

On average, its around 23.6 miles per gallon. So: 30/23.6 = 1.27 gallons used for a 30 mile trip.

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How far can 5 gallons of gas get you? ›

A car can average 140 miles on 5 gallons of gasoline.

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How many miles is a full tank of gas? ›

Your car can typically travel 200 to 400 miles on a full tank of gas. How far your car can go depends on three main factors. Miles per gallon of your vehicle is one of them.

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How to calculate gas mileage? ›

The easiest way to calculate your gas mileage is to simply divide the number of miles traveled by the number of gallons of gas your vehicle took to refill. In sum, that's miles driven divided by gallons of gas used.

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How much gas to drive 1000 miles? ›

Take the distance, 1,000 miles, and divide it by your vehicle's MPG, 33 miles. The result, which is 30, is the number of gallons of gas you'll need to complete the road trip.

How can I work out my MPG? ›

When you next fill up, note the mileage driven. Fill the tank again and note the number of litres put in. Divide the number of miles driven by the amount of fuel used in litres (miles per litre) To convert the figure to miles per gallon multiply it by 4.544.

What is the formula for gas usage? ›

Take a meter reading, then subtract the previous meter reading from the new meter reading to work out the volume of gas used. Multiply by volume correction factor (1.02264). Multiply by calorific value (40.0). Divide by kWh conversion factor (3.6).

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How do I calculate my mileage pay? ›

To calculate a mileage reimbursem*nt, multiply the number of business miles driven by the current mileage rate set either by the state or the IRS, whichever is applicable. Suppose, for example, you drove 100 miles for business purposes.

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