Estimate the gas cost for any trip from distance, fuel efficiency, current fuel price, and passengers. Works for any vehicle.
A fuel cost calculator estimates how much a trip costs in gas based on distance, vehicle fuel efficiency, current fuel price, and the number of passengers splitting the cost. It works for any vehicle — car, SUV, truck, motorcycle — and accepts miles or kilometers, mpg or L/100km, and USD per gallon or per liter. The output is total fuel cost, gallons needed, cost per mile, and cost per passenger for splitting.
$37.50
10.71 gal
$0.13/mi
$37.50
Conversion: 1 mile = 1.609 km; 1 gallon = 3.785 L; mpg to L/100km = 235.215 ÷ mpg. Real-world MPG varies with driving conditions, traffic, weather, and cargo.
| Distance | @ 20 mpg | @ 30 mpg | @ 40 mpg |
|---|---|---|---|
| 100 miles | $17.50 | $11.67 | $8.75 |
| 250 miles | $43.75 | $29.17 | $21.88 |
| 500 miles | $87.50 | $58.33 | $43.75 |
| 1000 miles | $175.00 | $116.67 | $87.50 |
Cross-checked against authoritative formulas (IRS, NIST, ACM) and updated for 2025/2026 tax years and rates.
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Estimates only. Calculator results are for educational and planning purposes — not professional advice. For binding decisions on taxes, investments, health, or legal matters, consult a qualified professional.
FAQ
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A fuel cost calculator is a free trip-planning tool that estimates how much gas a road trip will cost. Our fuel cost calculator needs four inputs: trip distance, vehicle fuel efficiency (mpg or L/100km), current fuel price (per gallon or per liter), and number of passengers (to split the cost). The fuel cost calculator returns total cost, gallons needed, cost per mile, and cost per passenger — useful for planning road trips, comparing driving to flying, or reimbursing mileage.
How it works
Our fuel cost calculator computes the cost of a road trip from distance, fuel efficiency, current fuel price, and the number of passengers.
Type the one-way or round-trip distance in miles or kilometers. The fuel cost calculator handles the conversion automatically.
Type your vehicle's fuel economy in mpg (US) or L/100km (Canada/Europe). The fuel cost calculator converts between the two. Use your actual MPG if you know it from your own fill-up tracking; otherwise use the EPA combined rating from the window sticker.
Type the local fuel price per gallon or per liter. Add the number of passengers to split the cost evenly if applicable. The fuel cost calculator recomputes everything as you type.
The fuel cost calculator shows total trip cost, gallons of fuel needed, cost per mile, and cost per passenger if splitting. A reference table below shows typical costs at common distances and MPGs.