Fuel Cost Trip Calculator
Enter your trip distance, vehicle MPG, and gas price to find the total fuel cost, total gallons needed, and the cost per mile driven. Use this to budget road trips, compare driving versus flying, or estimate commuting costs over time.
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Formula
Total Cost = (Distance ÷ MPG) × Price per Gallon
Dividing trip distance by MPG gives gallons consumed. Multiplying by the per-gallon price gives total fuel cost. Cost per mile is simply the price per gallon divided by MPG — it represents the fuel cost for each individual mile driven, regardless of the total trip length.
How to use the Fuel Cost Trip Calculator
- 1
Enter your trip distance (miles)
- 2
Enter your fuel efficiency (mpg)
- 3
Enter your gas price ($ per gallon)
- 4
Read your results instantly
Results update in real time as you type.
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Road Trip Budget Planning
Fuel is typically 20-30% of a road trip budget. The rest includes tolls, food, lodging, and activities. Use this calculator to find the fuel baseline, then multiply by 3-4 for a rough total trip budget estimate. For a 500-mile round trip at 28 MPG and $3.50/gallon, that is $62.50 in fuel — but the full weekend could cost $250-400 when all expenses are included. Knowing the fuel cost helps you decide whether driving or flying is more economical.
Driving vs. Flying Cost Comparison
To compare driving to flying, calculate round-trip fuel cost here, then add tolls, parking, and potential extra food stops. Compare that total to the all-in cost of flights including baggage fees, airport transportation, and ground transportation at the destination. For trips under 300 miles, driving is usually cheaper and competitive in total time. For trips over 600 miles, flying is often faster but not always cheaper, especially for multiple passengers sharing the fuel cost.
Tips & Insights
Include Round Trip
Double the distance for a round trip. A 250-mile destination is a 500-mile round trip. Enter the full round-trip distance for your total fuel budget.
Check Gas Prices Along the Route
Gas prices vary by state and region. GasBuddy shows prices along your route. Filling up in a cheaper state can save $10-20 on a long trip.
Account for City Driving at Destination
Highway MPG applies to the driving portions, but city driving at your destination will be lower. If you plan to drive extensively at the destination, reduce your MPG estimate accordingly.
Worked Examples
500-Mile Road Trip
$62.50 total, 17.86 gallons, $0.125/mile.
Cross-Country 2,500 Miles
$312.50 total, 89.29 gallons, $0.125/mile.
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Frequently Asked Questions
How is this different from the gas cost calculator?
They use the same formula. This calculator is framed for trip planning and also shows cost per mile. The gas cost calculator is identical in calculation but may be used for shorter, single-leg trips.
What is a typical cost per mile for fuel?
At 28 MPG and $3.50/gallon: $0.125/mile. At 20 MPG and $4.00/gallon: $0.20/mile. The IRS standard mileage rate (which includes fuel, maintenance, and depreciation) is around $0.67/mile as of 2024.
Should I use city or highway MPG?
For highway road trips, use highway MPG. For a mix of driving, most manufacturers provide a combined MPG rating — use that for the most realistic estimate.
How do I find cheap gas along my route?
GasBuddy.com and the GasBuddy app show prices by ZIP code and along road trip routes. Planning a fill-up in lower-cost states can meaningfully reduce trip fuel expenses.
Can I use this for an EV road trip?
Not directly. EVs are rated in kWh/100 miles. Use your EV efficiency and electricity cost to estimate: cost = (miles / 100) × kWh/100mi × $/kWh.
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