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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 2026-10-24; 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$37.60-18%
  2. 2Georgia$39.32-14%
  3. 3Texas$39.95-13%
  4. 4Louisiana$40.74-11%
  5. 5South Carolina$40.75-11%
  6. 6Alabama$41.01-11%
  7. 7Tennessee$41.01-11%
  8. 8Mississippi$41.23-10%
  9. 9Arkansas$41.29-10%
  10. 10Delaware$42.02-8%
  11. 11Missouri$42.20-8%
  12. 12Oklahoma$42.25-8%

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, 2026-10-24).

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 $30.29 on one trip.

  1. 1.North Carolina$42.11
  2. 2.Georgia$44.04
  3. 3.Texas$44.75
  4. 4.Louisiana$45.62
  5. 5.South Carolina$45.64
  6. 6.Alabama$45.94
  7. 7.Tennessee$45.94
  8. 8.Mississippi$46.18
  9. 9.Arkansas$46.25
  10. 10.Delaware$47.06
  11. 11.Missouri$47.27
  12. 12.Oklahoma$47.32
  13. 13.Kansas$47.42
  14. 14.Maryland$47.89
  15. 15.Indiana$48.28
  16. 16.Kentucky$48.59
  17. 17.Virginia$48.77
  18. 18.North Dakota$49.49
  19. 19.Florida$49.57
  20. 20.Rhode Island$49.85
  21. 21.New Jersey$50.16
  22. 22.Iowa$50.36
  23. 23.Minnesota$50.47
  24. 24.West Virginia$50.54
  25. 25.New Hampshire$50.63
  26. 26.Massachusetts$50.74
  27. 27.South Dakota$50.80
  28. 28.New Mexico$50.83
  29. 29.Connecticut$51.66
  30. 30.Maine$51.70
  31. 31.Nebraska$52.01
  32. 32.Vermont$52.32
  33. 33.District of Columbia$52.37
  34. 34.New York$52.66
  35. 35.Colorado$52.94
  36. 36.Montana$52.94
  37. 37.Wyoming$53.05
  38. 38.Ohio$53.08
  39. 39.Pennsylvania$53.42
  40. 40.Arizona$54.26
  41. 41.Wisconsin$54.26
  42. 42.Utah$56.12
  43. 43.Idaho$56.40
  44. 44.Michigan$58.04
  45. 45.Alaska$58.38
  46. 46.Oregon$58.52
  47. 47.Illinois$58.79
  48. 48.Nevada$63.62
  49. 49.Washington$63.77
  50. 50.Hawaii$67.90
  51. 51.California$72.40

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, $3.51) costs far less than in the most expensive (California, $6.03). 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.