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Trip Gas Cost Calculator

Calculate fuel gallons and cost from total trip miles, expected US MPG and an entered price per US gallon. Save planned or observed cases.

Use this result well

Inputs that matter
Total trip distance (miles), Observed fuel economy (US MPG), Gas price (USD/US gallon)
Output to expect
Gas trip cost
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Fuel quantity

MPG must be positive. Zero distance and a zero fuel price are valid entered cases.

US gallons = total miles ÷ US MPG

Trip cost

Money is displayed to cents; actual consumption and prices can change with load, weather and traffic.

Cost = gallons × USD per US gallon; cost/mile = price ÷ MPG

Updated: September 2026

Example Scenarios

350 total miles, 28 US MPG and $3.65 per US gallon.

→ 12.5 US gallons and $45.63 displayed fuel cost.

Zero total miles with a positive MPG.

→ Zero fuel quantity and trip cost.

Common Mistakes to Avoid

Doubling a distance that already includes the return

Choose one complete itinerary distance and enter it once.

Reading fuel cost as the full trip budget

Add lodging, group food, fees and a reserve in Road Trip Budget.

FAQ

No. The main result uses exactly the total distance entered. A separate twice-this-distance reference helps when you intentionally entered only one leg.

These fields use US gallons and US MPG. Convert incompatible units first; use the EV energy calculator for billed electricity.

Use Save planning case to store the completed inputs and result in this browser. Copy MD includes the inputs and interpretation; Download CSV contains the result breakdown. Keep copied Markdown separately for a portable record. Editing a case requires saving again; browser history is not cloud backup.

About Trip Gas Cost Calculator

Enter the complete trip distance once, including any return leg or detours you want covered. Use representative US MPG and a current price assumption. Save a planned or observed case with its inputs; the tool does not fetch fuel prices or route distances.