Cars & VehiclesTrip Fuel
Gas Cost Calculator
Calculate gasoline trip expenses for one-way or round-trip journeys based on driving distance, vehicle fuel economy (MPG), and current pump prices.
Calculation Results
Trip Gasoline Cost Formula
Gas Cost = (Trip Distance / Vehicle MPG) × Gas Price per Gallon (× 2 for Round-Trip)- Gallons Consumed = Total Miles Driven / Vehicle EPA Combined MPG rating.
- Total Fuel Cost = Gallons Consumed × Current Price per Gallon.
- Cost per Mile = Gas Price per Gallon / Vehicle MPG.
Step-by-Step Worked Example
Scenario: Calculating gas cost for a 450-mile round-trip at 30 MPG with gas at $3.65/gallon
Calculation Steps:
- Total Round-Trip Distance = 450 × 2 = 900 miles
- Total Gallons Required = 900 miles / 30 MPG = 30.0 gallons
- Total Gas Cost = 30.0 gallons × $3.65 = $109.50
- Fuel Cost per Mile = $109.50 / 900 = $0.122 / mile
Result: The round-trip requires 30 gallons of gasoline and costs $109.50.
How to Use This Calculator
- 1Enter your one-way driving distance in miles.
- 2Toggle the Round-Trip switch if returning by the same route.
- 3Input your vehicle’s fuel efficiency (MPG) and local fuel price per gallon.
Assumptions & Limitations
- Assumes steady driving conditions matching your vehicle’s combined or highway MPG.
Frequently Asked Questions
How do I find my vehicle’s real MPG rating?
You can check your vehicle window sticker, look up your car on FuelEconomy.gov (official US EPA data), or use our Gas Mileage Calculator to measure your real-world odometer consumption.
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