Trip fuel cost calculator
A 300 mi trip in a 2026 Honda Civic uses about 8.3 gal (31.5 L) and costs about $36 at U.S. average prices. Enter your distance, pick your car or type your own efficiency, and choose a state or price.
Trip fuel cost
A 300 mi trip in the 2026 Honda Civic costs about $36 in fuel.
2026 Honda Civic
- Trip fuel cost
- $36
- Fuel used
- 8.3 gal (31.5 L)
- Distance
- 300 mi
- ≈ 483 km
- Cost per mile
- 12.0¢
- Cost per km
- 7.5¢
The same car over other distances
| Distance | Fuel cost | Fuel or energy |
|---|---|---|
| 100 mi | $12 | 2.8 gal |
| 250 mi | $30 | 6.9 gal |
| 500 mi | $60 | 13.9 gal |
| 1,000 mi | $121 | 27.7 gal |
Assumptions used
- 300 mi (≈ 483 km).
- Regular gasoline: $4.36/gal (U.S. average, EIA, Sep 2026).
- Costs of $10 or more are rounded to the nearest dollar; smaller amounts show cents.
- Speed, towing, roof racks, hills, wind and weather change real fuel use. This tool uses EPA's combined rating, a mix of city and highway driving.
What this calculator does
It turns a trip distance into fuel or electricity used and what it costs. Pick a real car from the EPA database, or type your own MPG or kWh per 100 miles if you know it.
The price comes from the state you choose (EIA monthly averages) or the price you type, so you can price the trip at the pump near you.
How the trip cost is calculated
Gas, diesel and hybrid: distance in miles ÷ MPG gives gallons; gallons × price per gallon gives the cost. Kilometers are converted to miles first, and liters are shown next to gallons.
Electric: distance in miles × kWh per 100 miles ÷ 100 gives kWh; kWh × price per kWh gives the cost.
A round trip simply doubles the distance.
Assumptions
- Fuel use follows EPA's combined rating, which blends 55% city and 45% highway driving. A long steady highway run can differ from it.
- The whole trip is priced at one price per gallon or kWh, from your state's EIA monthly average or the price you type. Pump prices along the way will vary.
- Electric trips are priced at the residential electricity price, as if you charged at home. Public fast charging usually costs more per kWh.
- Plug-in hybrids are priced on gasoline only, because EPA's utility factor describes a year of driving rather than one trip.
- Hydrogen and natural gas vehicles are not priced because there is no reliable official price series for them.
Where the numbers come from and how fresh they are:
Frequently asked questions
How do I calculate the fuel cost of a road trip?
Divide the trip distance in miles by the car's MPG to get gallons, then multiply by the price per gallon. For an electric car, multiply the miles by its kWh per 100 miles, divide by 100, and multiply by the price per kWh.
Can I enter kilometers instead of miles?
Yes. Choose kilometers in the distance unit. The tool converts to miles, because EPA ratings are per mile, and shows the amount of fuel in gallons and liters.
Which gas price should I use for a trip?
Use the state you will fill up in, or type the price you expect to pay. A state's EIA average is a monthly figure, so the pump in front of you may be higher or lower.
Does it work for electric cars?
Yes. It uses the car's kWh per 100 miles and your state's residential electricity price, which is the cost of charging at home. Public fast charging usually costs more. See home versus public charging costs.
Why is a plug-in hybrid priced on gasoline only?
EPA's utility factor says what share of a year's driving is electric, which does not describe one trip. Pricing the trip on gasoline keeps the estimate honest for long distances; a charged battery would lower the first part of the trip.