Gas Trip Cost Calculator — How Much Will Gas Cost?

Calculate the total fuel cost for your trip. Enter your distance, fuel efficiency, and gas price to see gallons needed, total cost, and cost per mile. Enable round-trip for return journey costs.

Gas Trip Cost MPG Calculator Fuel Consumption
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Trip Cost
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How to Calculate Gas Cost for a Trip

  1. Find your distance in miles (use Google Maps or your car’s nav).
  2. Know your MPG: check your car’s specs or use our MPG Calculator to measure it.
  3. Check the gas price at your local station or check the AAA national average.
  4. Formula: Gas cost = (Distance ÷ MPG) × Gas price.

Example: 500-mile road trip in a 30 MPG car at $3.50/gal: 500 ÷ 30 × $3.50 = $58.33. Round trip: $116.67.

Quick Reference: Trip Gas Cost Estimates

Estimated fuel cost at $3.50/gal. Actual cost varies by local price and driving conditions.

Distance 18 MPG
(Truck)		 25 MPG
(City)		 30 MPG
(Hwy)		 35 MPG
(Efficient)		 50 MPG
(Hybrid)
100 mi $19.44 $14.00 $11.67 $10.00 $7.00
200 mi $38.89 $28.00 $23.33 $20.00 $14.00
300 mi $58.33 $42.00 $35.00 $30.00 $21.00
500 mi $97.22 $70.00 $58.33 $50.00 $35.00
750 mi $145.83 $105.00 $87.50 $75.00 $52.50
1,000 mi $194.44 $140.00 $116.67 $100.00 $70.00
1,500 mi $291.67 $210.00 $175.00 $150.00 $105.00
2,000 mi $388.89 $280.00 $233.33 $200.00 $140.00
Cost/mile $0.19 $0.14 $0.12 $0.10 $0.07

Popular Trip Distances

Factors That Affect Your Real Fuel Cost

Your actual fuel efficiency may differ significantly from EPA estimates:

  • City vs highway: City driving uses 15–30% more fuel than highway. A car rated 30 MPG highway may get only 22–24 MPG in city traffic. (Source: fueleconomy.gov)
  • Speed: Above 50 mph, fuel economy drops rapidly — roughly 7% for each 5 mph over 50. At highway speeds of 75 mph, you may use 15–20% more fuel than at 55 mph. (Source: DOE)
  • Cold weather: Short trips in cold weather can reduce MPG by 15–25%. The engine takes longer to reach efficient operating temperature. (Source: fueleconomy.gov)
  • Roof cargo: Reduces fuel economy by 2–8% in city, 10–25% on highway at 65–75 mph. A rear-mounted cargo box reduces MPG by only 1–5%. (Source: DOE)
  • Towing: Reduces MPG by 20–50% depending on weight. A 3,000 lb trailer can cut a truck’s MPG from 20 to 12–14.
  • Tire pressure: Each 1 PSI drop below recommended level costs ~0.3% in fuel economy. (Source: fueleconomy.gov)
  • Aggressive driving: Speeding, rapid acceleration, and hard braking reduce MPG by 15–30% on highways, 10–40% in stop-and-go. (Source: DOE)

Gas Prices Vary by Region

The national average fluctuates within a $2.50–$5.00/gal range historically. Key regional differences:

  • Most expensive: California, Hawaii, and Washington are consistently $0.50–$1.50 above the national average due to state taxes and blend requirements.
  • Cheapest: Texas, Oklahoma, and Mississippi are typically $0.20–$0.40 below the national average.
  • Highway premium: Gas stations near highway exits and airports often charge $0.20–$0.50 more per gallon. Drive a few blocks off the highway for better prices.
  • Seasonal variation: Summer blend gasoline (May–September) costs more to produce, adding $0.10–$0.30/gal. Winter blend is cheaper.

Check current prices at AAA Gas Prices or use apps like GasBuddy to find the cheapest stations along your route.

Drive vs. Fly: When Is Driving Cheaper?

As a rule of thumb, driving is cheaper for 1–2 people on trips under 400–500 miles. Beyond that, flying often wins on time and sometimes on cost.

Example 1 — NYC to Washington DC (225 miles):

  • Gas cost (25 MPG): 225 ÷ 25 × $3.50 = $31.50 one-way
  • Budget flight: ~$80–$120 per person
  • For 1 person: similar cost. For 2+: driving wins.

Example 2 — NYC to Chicago (790 miles):

  • Gas cost (25 MPG): 790 ÷ 25 × $3.50 = $110.60 one-way
  • Budget flight: ~$100–$200 per person
  • Solo traveler: flying is likely cheaper when you factor in time, food, and wear. Family of 4: driving may win.

Don’t forget hidden driving costs: tolls ($0.05–$0.15/mile on toll roads), vehicle wear and tear (~$0.10–$0.15/mile), meals on the road, and hotel costs for multi-day drives.

How to Save on Gas for Your Trip

  • Compare prices: Use apps like GasBuddy or Waze to find the cheapest stations along your route. Savings of $0.20–$0.50/gal are common.
  • Fill up strategically: Top off before entering high-price states (CA, NV, WA) or near airports.
  • Drive 55–65 mph: Fuel economy drops sharply above 65 mph. Cruise control helps maintain a steady, efficient speed.
  • Remove roof racks when not in use — they create drag and cost you 2–25% in fuel economy.
  • Check tire pressure before departure — properly inflated tires improve MPG by up to 3%.
  • Carpool or rideshare: Split gas costs using the passenger field in the calculator above.
  • Warehouse clubs: Costco and Sam’s Club gas is typically $0.10–$0.30/gal cheaper than surrounding stations.

Frequently Asked Questions

How do I calculate gas cost for a trip?

Divide distance by MPG to get gallons needed, then multiply by gas price. Example: 300 miles ÷ 25 MPG × $3.50/gal = $42.00.

How much does it cost to drive 1,000 miles?

At 25 MPG and $3.50/gal: 1,000 ÷ 25 × $3.50 = $140.00. At 35 MPG: $100.00. Actual cost depends on your vehicle’s MPG and local gas prices.

How do I calculate cost per mile?

Gas price ÷ MPG = cost per mile. At 25 MPG and $3.50/gal: $3.50 ÷ 25 = $0.14/mile. At 35 MPG: $0.10/mile.

Should I calculate for round trip?

Yes — enable the round-trip toggle above to automatically double the distance and cost. A 300-mile one-way trip at $42.00 becomes $84.00 round trip.

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Gas prices are estimates. US gallon = 3.785 liters. Actual fuel consumption varies by driving conditions, traffic, terrain, and vehicle maintenance. Last reviewed: 2026-08-11.