Fuel Cost Calculator
The trip at the pump — distance and your car's real MPG into gallons burned, dollars out, cents per mile, and the per-person split.
Fuel Cost Calculator
Results recalculate instantly on every keystroke. Nothing you type is transmitted.
What this result does not account for
- Miles and US gallons — the converters own metric translation
- Distance 0 to 50,000; MPG 1 to 200; price 0.01 to 10
In short: 560 miles at 28 MPG burns 20 gallons — $70.00 at $3.50 a gallon, 12.5¢ a mile. Split four ways that is $17.50 a person, which is usually cheaper than anyone at the pump guesses.
Formula
gallons = miles ÷ MPG; cost = gallons × price per gallon; per person = cost ÷ passengers
A trip's fuel cost is distance divided by your real-world MPG, times the price the pump is charging today. The cents-per-mile card is the number that compares across cars and routes; the split card divides the bill by the people sharing it. Your dash average runs a little optimistic, so the honest MPG comes from the full-to-full measure — the gas mileage page computes it from two fill-ups.
Worked Example
- Enter the trip distance in miles.
- Enter your car's MPG and today's pump price.
- Read the gallons, the bill, and the split.
Defaults: 560 miles at 28 MPG and $3.50 a gallon — 20 gallons, $70.00, 12.5¢ a mile.
Strengths & Limits Of This Model
Where this engine is strong
- Gallons, bill and split in one read
- Cents per mile for cross-trip comparison
- The honest-MPG page named
Where it stops
- Fuel only — tolls and wear are other pages' lines
Practical Use Cases
Road trips
the fuel line of the trip budget
Commute math
what the drive costs a month
Ride shares
the fair per-person split
Methodology & Editorial Standards
Computation runs in IEEE-754 double precision at full internal precision; rounding to two decimal places occurs strictly at the display layer, so no cumulative drift enters the result. All monetary outputs use accounting presentation — grouped thousands, two decimals, negatives in parentheses — so figures can be transcribed directly into a model or working paper. Division-by-zero and out-of-domain inputs return an em-dash rather than a misleading number.
This engine was reconciled against an independent reference implementation and hand-verified for the worked example above before release. Our full five-stage review process is published on the About Us page.
Disclaimer. This calculator is provided for informational and modelling purposes only and does not constitute financial, tax, legal, medical, or engineering advice. Verify all figures with a qualified professional before acting on them.
Fuel Cost Calculator — 8 Expert FAQs
8 analyst-written answers to the questions practitioners actually ask — optimised for voice and answer-engine retrieval.
Where does the MPG number come from?
Your car, honestly measured: the full-to-full method — fill up, drive, fill again, miles over gallons — which is the gas mileage page's whole job. The dash average is fine for trends but runs optimistic; the EPA sticker is a lab number.
Does the trip include the drive home?
Enter one-way distance here; double it for the round trip. The split card works on whatever distance you enter, so a round-trip split is one doubled entry away.
What about tolls and wear?
This page is the pump only — fuel is one line of a trip's cost. Tolls, tires and depreciation are the reimbursement pages' argument, priced at the rate your policy sets, not at the pump's.
Why cents per mile?
Because it is the number that survives the trip: 12.5¢ a mile prices any distance at this car's appetite, which is how commute months and cross-country summers compare on one line.
How exact is the split?
Exact division of the fuel bill by the passengers you name. It prices the fuel only — parking, snacks and tolls are separate lines; add them before the split if the car is settling up in full.
Can the price be zero?
Yes — an electric swap-in or a free future prints an honest $0.00. The gallons card still reports what the distance burns; only the money reads zero.
Does driving style change this?
It changes the MPG you feed in — which is why the mileage page measures rather than assumes. Highway pace, roof racks and a heavy right foot all live inside that one number.
What about litres and kilometres?
The page speaks miles and gallons because the pump and the odometer here do; the converters pages translate litres, kilometres and the L/100km scale, which runs backwards — lower is better.