Calculate fuel costs for trips based on distance, fuel efficiency, and gas price with route comparison and annual fuel budget estimates.
The gas cost calculator converts distance, fuel efficiency, and fuel price into the dollars a trip will burn, then extends the same arithmetic to route comparisons and an annual budget. Enter a distance and your vehicle's miles-per-gallon figure at today's pump price, and it returns fuel consumed and cost per trip. The input people most often get wrong is efficiency: the EPA rating on the window sticker is not what you get in winter traffic with a loaded trunk, and mixing up miles per gallon with gallons per mile swings the answer more than any other mistake.
A concrete input and expected output from the current implementation.
Input
Distance: 120 miles | Efficiency: 30 mpg | Gas price: $3.50 per gallon | Annual driving: 15,000 miles
Expected output
Trip: 4.0 gallons used, $14.00. Annual: 500 gallons, $1,750, assuming efficiency and price hold all year.
120 miles at 30 mpg is 4 gallons, and 4 gallons at $3.50 is $14.00. Scaling the same division to 15,000 miles gives 500 gallons, and 500 gallons at $3.50 is $1,750.
Cost comes straight from the fuel-consumption identity: fuel used equals distance divided by efficiency, and cost equals fuel used times price per unit. A 120-mile drive at 30 mpg uses 4 gallons, and 4 gallons at $3.50 is $14.00. The calculator applies that multiplication consistently and formats the result as a currency amount.
Multiple route entries can be held side by side, each with its own distance, efficiency, and price, so the shortest route and the cheapest route are visibly different numbers. The annual estimate scales a driving pattern out over a year: a distance traveled weekly or per year, at the same efficiency and price. All of it is straight-line multiplication - nothing compounds, and nothing adjusts for the seasons.
Use the observed figure from the trip computer or a fill-up log when you have one; EPA combined ratings come from standardized tests and tend to run optimistic in real driving. Without observed data, the combined EPA rating is the reasonable default, and expect real costs to run somewhat higher in winter or stop-and-go traffic. The calculator is only as accurate as the efficiency you enter.
No. The calculation is a straight line: distance divided by efficiency, times price. Idling burns fuel without adding miles, heavy loads cut efficiency, and seasonal price changes are not modeled. For an electric vehicle, the same arithmetic only holds if the tool accepts consumption in kilowatt-hours per mile and a price per kilowatt-hour - check the input units before relying on it.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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