Oregon Gas Tax Calculator
Oregon charges 40.0¢/gal on gasoline and 40.0¢/gal on diesel (all state taxes and fees). Combined with the federal tax, drivers in Oregon pay 58.5¢/gal total on gasoline.
OR gasoline (combined)
40.0¢
OR diesel (combined)
40.0¢
Federal gasoline tax
18.5¢
18.4¢ excise + 0.1¢ LUST
Combined (gas + federal)
58.5¢
Excise and combined rates are equal for Oregon — no separate fees apply.
Tax on 15 gallons of gasoline in Oregon
Federal tax
$2.77
Oregon tax
$6.00
Total tax
$8.78
This calculator is for informational purposes only and does not constitute tax advice. Consult a qualified tax professional for your specific situation. Rates last verified June 2026.
Verify rates on Oregon Department of Transportation — Current Fuel Tax RatesGas tax per fill-up in Oregon
| Tank size | State tax | Federal tax | Total tax |
|---|---|---|---|
| 10 gallons | $4.00 | $1.85 | $5.85 |
| 12 gallons | $4.80 | $2.22 | $7.02 |
| 15 gallons | $6.00 | $2.77 | $8.77 |
| 18 gallons | $7.20 | $3.33 | $10.53 |
| 20 gallons | $8.00 | $3.70 | $11.70 |
| 25 gallons | $10.00 | $4.63 | $14.63 |
| 30 gallons | $12.00 | $5.55 | $17.55 |
Gasoline only. State tax uses combined rate (all fees). Federal includes 18.4¢ excise + 0.1¢ LUST fee.
Oregon note: Excise and combined rates are identical at the state level as Oregon does not append per-gallon retail environmental cleanup fees. Commercial heavy vehicles over 26,000 pounds are exempt from the use fuel tax but are subject to a weight-mile tax program.