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Trip Fuel Cost Calculator

Estimate the fuel cost for a trip.

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Inputs

miles
MPG
$/gal

Your values stay on this device.

Results

Total Cost
Fuel Needed2.94

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Assumptions

  • MPG is treated as an average for the trip, not a live reading.
  • Gas price is constant across the whole journey.
  • Distance is entered in miles and should include a round trip if needed.

Sensitivity preview

Trip Distance -10%: Total Cost $11.78

Trip Distance Current: Total Cost $13.09

Trip Distance +10%: Total Cost $14.40

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About this Fuel Cost Calculator

Gas prices fluctuate constantly, making it hard to budget for travel. Whether you are driving cross-country or just commuting to work, this calculator estimates your fuel expenses based on your vehicle's efficiency and local fuel prices.

Who this calculator is for

  • Road trippers budgeting for a long drive before they leave.
  • Commuters comparing the real cost of getting to work by car.
  • Drivers who want a quick fuel budget without building a spreadsheet.

When to use it

  • Estimate the fuel cost for a one-way or round trip.
  • Compare commute costs across different vehicles or routes.
  • Translate current gas prices into a trip budget.

How to use this calculator

  1. Enter the total Trip Distance in miles.
  2. Input your vehicle's Fuel Efficiency (MPG).
  3. Enter the current Gas Price per gallon.
  4. The result shows the Total Cost and the gallons of fuel required.

Key assumptions

  • MPG is treated as an average for the trip, not a live reading.
  • Gas price is constant across the whole journey.
  • Distance is entered in miles and should include a round trip if needed.

Dataset sources

EIA weekly retail gasoline prices
Effective date
2026-05-04
Last reviewed
2026-05-06

Fuel prices are weekly regional averages for planning only. Pump prices, fuel grade, taxes, fees, and station pricing can differ materially.

Public U.S. Energy Information Administration weekly retail gasoline price data.

FuelEconomy.gov vehicle MPG estimates
Effective date
2026
Last reviewed
2026-05-06

EPA MPG estimates are planning references. Real-world fuel economy varies with speed, weather, load, maintenance, route, and driving behavior.

Public EPA/DOE FuelEconomy.gov vehicle fuel-economy estimates.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

Gallons Needed = Distance / MPG Total Cost = Gallons Needed × Price per Gallon

Inputs explained

Trip Distance

The total length of your journey. Remember to double it for a round trip.

Fuel Efficiency

Miles Per Gallon (MPG). You can find this on your car's dashboard or look up the EPA rating for your make/model.

Gas Price

The cost per gallon at the pump.

Understanding your results

The result is an estimate. Real-world conditions like traffic, heavy loads, roof racks, and aggressive driving can lower your MPG and increase the cost.

Example scenarios

Road Trip

Distance 500 miles. MPG 25. Gas $3.50. Fuel needed: 20 gallons. Cost: $70.

Daily Commute

20 miles/day. MPG 30. Gas $4.00. Daily Cost: $2.67. Monthly (20 days): $53.40.

Key Features

  • Simple Cost Estimation
  • Fuel Volume Calculation
  • Commute Planning

Tips & Best Practices

  • Highway driving usually yields better MPG than city driving due to fewer stops.
  • Using air conditioning can reduce fuel economy by up to 25% in stop-and-go traffic.
  • Keep tires properly inflated to maximize efficiency.

Glossary of Terms

MPG
Miles Per Gallon. A measure of how far a vehicle can travel on one gallon of fuel.
Range
The total distance a vehicle can travel on a full tank of gas.

Frequently Asked Questions

How can I improve my fuel efficiency?
Drive steadily, avoid rapid acceleration and braking, remove excess weight from the car, and keep tires properly inflated.
Does using the AC waste gas?
Yes, the AC compressor puts a load on the engine. At low speeds, open windows are more efficient. At highway speeds, the aerodynamic drag from open windows makes AC the better option.
How do I calculate MPG manually?
Reset your trip odometer when you fill up. At the next fill-up, divide the miles traveled by the gallons required to refill the tank.