A gas calculator, such as one provided by the American Automobile Association (AAA), can be used for a trip to estimate the amount of gas used and total cost based on the United States current average. Users enter their starting destination, ending destination and information about their car to view amount and cost. Some sites, such as Gas Buddy, will also show where to find the least expensive gas while on the trip.Continue Reading
Use the following steps to calculate the amount of gas used on a trip.
Go to a website that provides a gas calculator. Options include AAA, Gas Buddy and the U.S. Department of Energy.
Enter the trip's starting and ending destination using a common format, such as ZIP code, city and state or exact address. Choose whether it is a one-way trip or round trip.
Enter the year, make and model of the vehicle that will be used for the trip. This is used to determine the tank size, miles per gallon and fuel type for the vehicle.
Click on the calculate button to display information about the trip. For example, clicking on "Fuel My Trip" on Gas Buddy displays total cost, fuel used, carbon footprint, distance traveled and a list of gas stations along the route to refuel.