Fuel Cost Calculator

Trip fuel cost from distance, efficiency and gas price — for one-way or round trips.

mi
mpg
$

Per gallon (or per liter with metric).

Enter your details and press Calculate to see results.

Formula

cost = distance × multiplier ÷ mpg × price

Example

250 miles at 28 mpg with $3.50 gas ≈ $31 one way, $63 round trip.

Splitting costs

Dividing the result by passengers gives a fair per-person contribution before tolls. Highway driving usually beats the rated figure; city stop-start falls below it.

Frequently asked questions

How accurate is the estimate?

Within ~10% for steady highway trips; add margin for mountain passes, AC use or roof racks.

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