Calculate total fuel cost for a road trip based on distance, MPG, and gas prices.
This tool turns three numbers into one: distance, fuel economy, and gas price become a total fuel budget. It divides the miles you enter by the vehicle's MPG to get gallons burned, then multiplies by the price per gallon. The number people usually get wrong is the distance: entering a one-way trip when the budget needs to cover the round trip, which halves the result. And because the estimate assumes steady cruising conditions, a real trip loaded with luggage, climbing grades, and running the air conditioning typically costs a bit more than the tool reports.
A concrete input and expected output from the current implementation.
Input
Distance: 1,200 miles | Fuel economy: 28 MPG | Price: $3.50 per gallon
Expected output
Gallons burned: 42.9 | Total fuel cost: $150.00
1,200 miles at 28 MPG burns 1,200 / 28 = 42.9 gallons, and 42.9 gallons at $3.50 each is $150.00. Doubling any one input doubles the total.
The total is (distance / MPG) x price per gallon. Distance and MPG combine first to produce gallons burned, then the price converts gallons into dollars. Because it is a single multiplication chain, every input scales the result proportionally: doubling the distance doubles the cost, and so does halving the MPG. That proportionality is why a small change in fuel economy matters more on a long trip.
The tool applies the single fuel economy you enter to every mile, so it cannot tell the 80 mph interstate leg from the mountain pass. Best input is the trip computer's average from similar recent driving, or the EPA combined figure as a starting point. Towing, roof cargo, cold weather, and stop-and-go traffic all push real consumption above the rating, so treat the result as an ideal-case floor, not a guarantee.
No. The tool returns fuel cost for exactly the distance entered: no tolls, no parking, no meals, and no return leg unless you typed the round-trip distance. For a complete trip budget, add those yourself. Fuel is usually the largest single line item, but it is deliberately the only one this tool computes.
Close, and usually a little more. The math is exact, but the inputs are estimates: real-world MPG tends to run below the rated figure, pump prices drift while you travel, and traffic or mountain miles burn extra fuel. Treat the result as a planning number rather than a price promise, and hold a small cushion on top.
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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