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Fuel Calculator

Calculate trip fuel cost and cost per mile.

Reviewed by the KakouCalc editorial team · Updated July 2026

$
Total Fuel Cost
$42.00
Gallons Needed
12.00
Cost per Mile
$0.140
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How to use the Fuel Calculator

The Fuel Calculator is free and runs entirely in your browser — no sign-up, and nothing you enter leaves your device. It opens pre-filled with a realistic example, so you can see how it works before replacing any figure with your own; the results update as you type. Press Calculate to refresh the result panel, or Reset to return to the example.

The inputs it asks for:

  • Distance (miles) — a number.
  • Fuel Economy (MPG) — a number.
  • Fuel Price per Gallon — a dollar amount.

Worked example

Using the example values — Distance (miles) 300, Fuel Economy (MPG) 25, Fuel Price per Gallon $3.50 — the Fuel Calculator returns a Total Fuel Cost of $42.00. It also reports Gallons Needed (12.00), Cost per Mile ($0.140).

Prefer your own numbers? Change any field above and this recomputes instantly.

Educational information, not financial advice. See our methodology for how these tools are built and checked.