Fuel Cost Calculator: How Much Will Your Trip Cost in Gas?
How much will this trip cost in gas?
Fuel Cost Calculator
Trip Cost · Annual Burden · Gas Price Sensitivity · Vehicle Comparison
Results update in real time as you adjust any input.
Trip — Vehicle 1
Vehicle 2 Comparison (optional)
Annual & Income
US average: ~13,500 miles/yr
Results are estimates only and do not constitute professional advice.
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Fuel cost is the most underestimated expense in road trip planning and the most ignored variable when comparing vehicles. This calculator gives you the exact fuel cost for any trip based on your vehicle's MPG and the current gas price — plus a cost-per-mile breakdown you can use for reimbursement calculations, business mileage tracking, or just deciding whether to drive or fly. Enter your trip distance (one way or round trip), your vehicle's combined MPG, and today's gas price per gallon. The calculator returns total fuel cost, cost per mile, and a fuel sensitivity table showing how cost changes with gas price swings of ±$0.50/gallon — useful for planning a trip when gas prices are volatile. It also includes a vehicle comparison mode: enter a second vehicle's MPG to see the exact dollar savings over the trip and over 12,000 annual miles. If you're debating buying a more fuel-efficient car, the annual savings calculator shows the payback math. The IRS standard mileage rate for 2024 is $0.67/mile — but your actual cost per mile depends entirely on your vehicle and local gas prices. This calculator shows your real number so you can compare it to the IRS rate for reimbursement purposes.
- →Planning a road trip and want to budget total fuel cost
- →Comparing the cost of driving vs. flying for a specific trip
- →Calculating fuel reimbursement for business or personal mileage
- →Comparing two vehicles for fuel efficiency on a specific route
- →Estimating monthly fuel costs for your commute
Sarah is planning a 680-mile round trip from Chicago to Cincinnati. Her 2021 Honda CR-V gets 30 MPG. Gas is $3.49/gallon. The calculator shows: 22.7 gallons needed, $79.18 total fuel cost, $0.116/mile. Her friend suggests taking his truck (18 MPG) — the calculator shows that costs $131.97, $52.79 more. At $3.99/gallon (if prices spike), Sarah's trip cost rises to $90.57. Round trip breakdown makes it clear: driving beats flying for this distance even at premium gas prices.
How do I find my vehicle's actual MPG?
The most accurate method: fill your tank completely, reset your trip odometer, drive normally until nearly empty, fill up again. Divide the miles driven by the gallons it took to refill. Your car's displayed 'average MPG' is often optimistic. EPA estimates (on the window sticker and at fueleconomy.gov) reflect lab conditions — real-world MPG is typically 10–20% lower for highway and 15–25% lower for city driving.
Does driving speed significantly affect fuel cost?
Yes. Most vehicles achieve peak fuel efficiency between 45–65 mph. Above 65 mph, aerodynamic drag increases significantly — going from 65 to 80 mph reduces fuel economy by approximately 15–20%. On a 500-mile highway trip, slowing from 80 to 65 mph can save 2–3 gallons, or $7–10. The time cost is about 30–45 minutes.
What's the IRS mileage rate and how does it compare to actual cost?
The IRS standard mileage rate for 2024 is $0.67/mile for business use. This rate covers fuel, depreciation, insurance, and maintenance — not just gas. Your actual fuel-only cost per mile is typically $0.08–0.18/mile depending on your vehicle's MPG and local gas prices. If you're being reimbursed at the IRS rate, you're being compensated for more than just fuel.
Is driving or flying cheaper for trips under 500 miles?
Driving wins on fuel cost alone for almost any trip under 500 miles — a 400-mile drive typically costs $25–60 in fuel vs. $150–400 for a last-minute flight. But factor in: parking, tolls, wear and tear (roughly $0.08–0.15/mile), and the opportunity cost of 6–8 hours driving vs. 2–3 hours flying. For one person with flexible time, driving usually wins. For families or groups, driving wins even more decisively on a per-person basis.