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Gas cost calculator

Enter your miles and MPG to estimate gas costs for a road trip or fill-up. Choose any US state, compare the same drive in dollars, or switch to metric units for an international trip. Prices are averages with their source dates shown.

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300 miles in United States · 10.71 US gal
$45.90
≈ €41.01

National average · 2026-10-19 · Weekly retail gasoline and diesel prices.

Estimated fuel cost. Individual stations and actual driving consumption will vary.

Comparison rows exclude overdue data. US state comparisons use AAA averages dated 2026-10-25; the US national baseline is EIA weekly data dated 2026-10-19.

Check United States prices and sources →
The same trip by US state · in USD · vs United States
  1. 1North Carolina$37.45-18%
  2. 2Georgia$39.20-15%
  3. 3Texas$39.83-13%
  4. 4South Carolina$40.53-12%
  5. 5Louisiana$40.62-12%
  6. 6Alabama$40.93-11%
  7. 7Tennessee$40.93-11%
  8. 8Mississippi$41.11-10%
  9. 9Arkansas$41.21-10%
  10. 10Delaware$41.91-9%
  11. 11Oklahoma$42.04-8%
  12. 12Missouri$42.10-8%

Not sure what your car actually does? Work out your real MPG from your last fill-up →

How to calculate gas cost for a trip

Gas cost = miles ÷ MPG × price per gallon. A 300-mile trip in a car that does 25 MPG burns 12gallons. At today’s US average of $4.28 a gallon, that is $51.41one way. The calculator above does the same sum with your own numbers and your state’s price.

Gas cost by distance and MPG

One-way gas cost at the US average of $4.28/gal for regular (AAA, 2026-10-25).

Distance20 MPG25 MPG30 MPG40 MPG
100 mi$21.42$17.14$14.28$10.71
250 mi$53.55$42.84$35.70$26.78
500 mi$107.10$85.68$71.40$53.55
1,000 mi$214.20$171.36$142.80$107.10

The same 300-mile trip in every state

A 25 MPG car, 300miles, at each state’s average for regular today — cheapest first. The gap between the top and bottom of this list is $30.35 on one trip.

  1. 1.North Carolina$41.94
  2. 2.Georgia$43.91
  3. 3.Texas$44.60
  4. 4.South Carolina$45.40
  5. 5.Louisiana$45.49
  6. 6.Alabama$45.84
  7. 7.Tennessee$45.84
  8. 8.Mississippi$46.04
  9. 9.Arkansas$46.15
  10. 10.Delaware$46.94
  11. 11.Oklahoma$47.09
  12. 12.Missouri$47.15
  13. 13.Kansas$47.32
  14. 14.Maryland$47.78
  15. 15.Indiana$47.96
  16. 16.Kentucky$48.47
  17. 17.Virginia$48.61
  18. 18.Florida$49.30
  19. 19.North Dakota$49.32
  20. 20.Rhode Island$49.85
  21. 21.New Jersey$50.08
  22. 22.Iowa$50.34
  23. 23.Minnesota$50.39
  24. 24.West Virginia$50.45
  25. 25.South Dakota$50.54
  26. 26.New Hampshire$50.56
  27. 27.New Mexico$50.59
  28. 28.Massachusetts$50.72
  29. 29.Maine$51.60
  30. 30.Connecticut$51.62
  31. 31.Nebraska$51.86
  32. 32.Vermont$52.27
  33. 33.District of Columbia$52.28
  34. 34.New York$52.61
  35. 35.Montana$52.84
  36. 36.Wyoming$52.90
  37. 37.Ohio$52.98
  38. 38.Pennsylvania$53.33
  39. 39.Colorado$53.48
  40. 40.Arizona$54.19
  41. 41.Wisconsin$54.40
  42. 42.Utah$55.87
  43. 43.Idaho$56.27
  44. 44.Michigan$57.96
  45. 45.Alaska$58.31
  46. 46.Oregon$58.48
  47. 47.Illinois$58.73
  48. 48.Nevada$63.59
  49. 49.Washington$63.67
  50. 50.Hawaii$67.91
  51. 51.California$72.29

Crossing several states? The road trip gas calculator prices each state along your route →

Common questions

How do I calculate the gas cost of a trip?

Divide the distance by your car's MPG to get the gallons, then multiply by the price per gallon. A 300-mile trip in a 25 MPG car uses 12 gallons; at today's US average of $4.28 that is $51.41. Double it for the round trip.

How much gas money do I need for a road trip?

Price the whole route rather than using one average: gas in the cheapest state (North Carolina, $3.50) costs far less than in the most expensive (California, $6.02). Our road trip calculator prices each state you cross, and adding 10% covers detours and city driving.

What is the gas cost per mile?

Price per gallon divided by MPG. At $4.28 a gallon, a 25 MPG car costs $0.17 a mile and a 40 MPG hybrid $0.11.

How much does it cost to fill up a gas tank?

Tank size times the price per gallon. A typical 15-gallon sedan tank costs $64.26 to fill from empty at today's US average, a 26-gallon pickup tank $111.38. Most people refuel with a quarter left, so a real fill-up is about three quarters of that.