Fuel Cost

1. Enter the total trip distance in miles or kilometers (for a round trip, double the one-way distance).
2. Enter your vehicle's fuel efficiency — find this in your owner's manual, on the window sticker, or on fueleconomy.gov. Use MPG for US units or L/100km for metric.
3. Enter the current price of fuel per gallon or per liter at your destination or local station.
4. Click 'Calculate' to instantly see your estimated total fuel cost for the trip.
5. Optionally, adjust any value — such as comparing a more fuel-efficient vehicle or a different route distance — to explore how much you could save.

Fuel Cost = (Distance ÷ Fuel Efficiency) × Fuel Price

• Fuel Cost — The total estimated monetary cost of fuel for the trip, expressed in dollars (or local currency).
• Distance — The total one-way or round-trip distance to be traveled, measured in miles or kilometers.
• Fuel Efficiency — Your vehicle's fuel economy rating — miles per gallon (MPG) in the US system, or liters per 100 kilometers (L/100km) in the metric system. A higher MPG means fewer gallons consumed.
• Fuel Price — The current price of fuel per gallon (US) or per liter (metric), in your local currency. Check a site like GasBuddy or your local gas station for current prices.

Fuel consumed = 952 miles ÷ 30 MPG = 31.73 gallons
Fuel Cost = 31.73 gallons × $3.45/gallon = $109.47

Result: Estimated round-trip fuel cost: **$109.47**

In this example, a round trip from Chicago to Nashville covering 952 miles in a vehicle that gets 30 MPG at a gas price of $3.45/gallon would cost approximately $109.47 in fuel. This figure is an estimate — actual costs can vary slightly due to driving conditions, speed, air conditioning use, road grade, and minor fluctuations in fuel prices along the route. Always budget a small buffer (5–10%) above your estimate for real-world variation.

Understanding Fuel Costs: What Drives the Price at the Pump?

The Three Key Levers

Your fuel cost for any trip is controlled by exactly three factors:

1. How far you drive — More miles = more fuel burned.
2. How efficient your vehicle is — A vehicle rated at 40 MPG will use half the fuel of one rated at 20 MPG over the same distance.
3. The price of fuel — Prices vary by region, season, and crude oil markets.

MPG vs. L/100km

In the United States, fuel economy is measured in miles per gallon (MPG) — a higher number is better. In most other countries, it is measured in liters per 100 kilometers (L/100km) — a lower number is better. Our calculator supports both systems.

How to Find Your Vehicle's MPG

• New vehicles: Check the EPA window sticker or visit fueleconomy.gov.
• Used vehicles: Look up the year, make, and model on fueleconomy.gov.
• Real-world MPG: Track your own fuel-ups using apps like Fuelly or GasBuddy.

Tips to Reduce Your Fuel Costs

• Maintain proper tire pressure — Under-inflated tires can reduce MPG by up to 3%.
• Avoid aggressive acceleration and hard braking — Smooth driving can improve efficiency by 15–30% on highways.
• Reduce highway speed — Fuel efficiency drops significantly above 60 mph.
• Remove excess weight — Every 100 lbs of extra cargo reduces MPG by about 1%.
• Use cruise control on long highway stretches to maintain a steady, efficient speed.
• Plan your route — Avoiding stop-and-go traffic improves fuel economy.

Round Trips vs. One-Way Trips

Don't forget to double your distance if you are calculating a round trip. Many users accidentally enter only the one-way distance and underestimate their total fuel budget by 50%.

Electric and Hybrid Vehicles

For electric vehicles, the equivalent calculation uses miles per kWh and the cost per kWh of electricity. Hybrid vehicles have a combined MPG rating, which you can use directly in this calculator.

• Entering one-way distance when calculating a round trip — always double the distance for a return journey.
• Using the 'city' MPG rating for highway-heavy trips, or the 'highway' MPG for city driving — use the combined MPG for mixed routes.
• Using an outdated gas price — fuel prices change daily; check a current source like GasBuddy or a local station before calculating.
• Forgetting that L/100km and MPG work inversely — do not mix units between the distance and efficiency fields.
• Ignoring real-world efficiency losses from cargo weight, AC use, headwinds, or mountain driving, which can reduce actual MPG by 10–20% versus the EPA estimate.

• Fuel Economy Guide — Official EPA Ratings by Vehicle — U.S. Department of Energy & U.S. Environmental Protection Agency
• Tips to Improve Your Gas Mileage — U.S. Department of Energy
• Factors Affecting Fuel Economy — Natural Resources Canada
• Annual Energy Outlook — Transportation Sector Energy Use — U.S. Energy Information Administration (EIA)

Only sources that have been reviewed are shown. Unverified citations are never published.