How to Use This Calculator
Our Trip Cost Calculator makes it easy to estimate your driving expenses before you hit the road. Follow these simple steps:
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Select your unit system — Choose between US (miles, MPG, $/gallon) or Metric (km, L/100km, $/liter) units at the top of the calculator.
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Enter your trip distance — Input the total distance of your trip. You can use either miles or kilometers depending on your unit selection.
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Enter your vehicle's fuel efficiency — Input your car's fuel economy. In US mode, use MPG (miles per gallon). In metric mode, use L/100km (liters per 100 kilometers).
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Enter the current fuel price — Input the price per gallon or per liter of fuel. Check local gas stations for accurate pricing.
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Add toll costs (optional) — If your route includes toll roads, enter the estimated total toll cost to get a complete trip expense.
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Enter number of passengers (optional) — If you're sharing costs with travel companions, enter the number of people to see the cost per person.
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Click "Calculate Trip Cost" — Instantly see your total fuel cost, fuel needed, cost per passenger, and total trip expense.
Trip Cost Formula
Our calculator uses the following formulas to compute your trip expenses:
For fuel estimation only (US):
For fuel estimation only (Metric):
Example Calculations
🚗 Example 1: Family Road Trip (US Units)
Scenario: A family of 4 drives 500 miles from New York to Ohio in a car that gets 25 MPG. Gas costs $3.50 per gallon, and tolls are $15.
Fuel needed: 500 miles ÷ 25 MPG = 20 gallons
Fuel cost: 20 gallons × $3.50 = $70.00
Total trip cost: $70.00 + $15.00 tolls = $85.00
Cost per person: $85.00 ÷ 4 people = $21.25 per person
🚗 Example 2: Cross-Country Trip (US Units)
Scenario: Driving 2,800 miles from Los Angeles to New York in an SUV getting 20 MPG. Gas is $3.80 per gallon, tolls are $50.
Fuel needed: 2,800 miles ÷ 20 MPG = 140 gallons
Fuel cost: 140 gallons × $3.80 = $532.00
Total trip cost: $532.00 + $50.00 tolls = $582.00
🚗 Example 3: Metric Road Trip (Metric Units)
Scenario: Driving 800 km from Paris to Marseille in a car with 7 L/100km efficiency. Diesel costs €1.60 per liter, tolls are €25.
Fuel needed: (800 km × 7 L/100km) ÷ 100 = 56 liters
Fuel cost: 56 liters × €1.60 = €89.60
Total trip cost: €89.60 + €25.00 tolls = €114.60
Cost per passenger (2 people): €114.60 ÷ 2 = €57.30 each
Frequently Asked Questions (FAQ)
How much gas will I need for my trip?
To calculate how much gas you need: divide your trip distance by your vehicle's fuel efficiency. In US units: gallons needed = distance (miles) ÷ MPG. In metric: liters needed = distance (km) × (L/100km) ÷ 100. For example, a 500-mile trip in a car that gets 25 MPG requires 20 gallons of gas. Use our Trip Cost Calculator above for an instant result.
How to calculate fuel cost for a road trip?
Calculate fuel cost for a road trip using this formula: Total Fuel Cost = (Distance ÷ Fuel Efficiency) × Fuel Price. In US units: (miles ÷ MPG) × price per gallon. In metric: (km × L/100km ÷ 100) × price per liter. Add toll costs for total trip expense. Our calculator does all this automatically — just enter your trip details and click calculate.
How do I calculate trip cost per person?
To calculate trip cost per person: first calculate the total trip cost (fuel + tolls), then divide by the number of passengers. Cost per passenger = (Total Fuel Cost + Tolls) ÷ Number of Passengers. This is especially useful for carpooling and group road trips. Enter the number of passengers in our calculator and it will automatically show the cost per person.
How much does it cost to drive X miles?
The cost to drive a specific distance depends on your vehicle's fuel efficiency and local gas prices. On average, driving 500 miles costs between $50-$100 in fuel for most vehicles. A car getting 30 MPG at $3.50/gallon costs about $58 for 500 miles, while an SUV getting 20 MPG at the same price costs about $87. Use our calculator with your specific MPG and fuel price for an accurate estimate.
How many gallons of gas for 500 miles?
A 500-mile trip requires approximately 14-25 gallons of gas depending on your vehicle's fuel efficiency. A fuel-efficient compact car getting 35 MPG needs about 14.3 gallons, while a pickup truck getting 18 MPG needs about 27.8 gallons. The formula is simple: gallons needed = miles driven ÷ MPG. For 500 miles at 25 MPG, you'll need 20 gallons.
How do I calculate trip fuel cost with tolls?
To calculate total trip cost including tolls: 1) Calculate fuel cost using (distance ÷ efficiency) × fuel price. 2) Add toll costs. Total = Fuel Cost + Toll Cost. Our trip cost calculator includes a dedicated toll cost field that automatically adds to the total, giving you a complete picture of your driving expenses including toll roads, bridges, and tunnels.
What is the cost per mile to drive?
The cost per mile to drive is calculated by dividing the total trip cost by the distance. For fuel only: cost per mile = fuel price per gallon ÷ MPG. At $3.50/gal and 25 MPG, fuel alone costs $0.14 per mile. If you include the IRS standard mileage rate (which factors in depreciation, maintenance, and insurance), the total cost is typically $0.60-$0.70 per mile for 2024-2025.
How to split gas cost among passengers?
To split gas costs fairly among passengers: 1) Calculate total fuel cost for the trip. 2) Add any toll expenses. 3) Divide equally by the number of passengers (including the driver unless agreed otherwise). Our Trip Cost Calculator includes a per-passenger cost feature that does this automatically. Simply enter the number of people sharing the cost and see the individual amount instantly.
Does fuel economy affect trip cost significantly?
Yes, fuel economy dramatically affects trip costs. A vehicle getting 15 MPG costs twice as much in fuel as one getting 30 MPG for the same distance. At $3.50/gal, a 500-mile trip costs $117 in a 15 MPG vehicle versus $58 in a 30 MPG vehicle. Over a long road trip, improving fuel efficiency by just 5 MPG can save $50-$100 or more. Better fuel efficiency saves significant money.
What other expenses should I budget for a road trip?
Beyond fuel and tolls, budget for: accommodation (hotels or camping), meals and snacks, vehicle maintenance checks, parking fees, attraction tickets, emergency funds, and insurance. A good rule is to estimate fuel costs first (using our calculator), then add 50-100% more for other expenses depending on your travel style. For a family of 4 on a week-long road trip, expect total expenses of $200-$400 per day including everything.