California Gas Tax Calculator

2026

California charges 65.64¢ a gallon in state tax on gasoline and 50.44¢ on diesel in 2026, on top of the federal 18.4¢ and 24.4¢: 84.04¢ and 74.84¢ a gallon in all. Estimate your fuel costs.

By Konstantin Iakovlev · Updated October 19, 2026 · Methodology

miles
MPG
$/gal
Trip Type

Fuel Needed

1.0 gal

Trip Cost

$4.33

Annual Cost

$1,125.80

Fuel Cost Breakdown

Total Distance30.0 miles
Fuel Needed1.00 gallons
One-Way Cost$4.33
Trip Cost$4.33
Weekly Cost$21.65
Monthly Cost$93.82
Annual Cost$1,125.80

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

California Gas Tax Overview

California’s state tax on gasoline is 65.64¢ a gallon and 50.44¢ on diesel, the rate in force since July 1, 2026. That is the highest state gasoline tax of the 50 states and DC. Excise and oil-spill fee adjusted for inflation each July 1; the 2¢ tank fee is fixed.

With the federal 18.4¢, a gallon of gasoline carries 84.04¢ of per-gallon tax, so a 15-gallon fill-up includes about $12.61 of fuel tax whatever the pump price. Sales tax also applies to fuel: 2.25% statewide on gasoline and 13% on diesel, plus local district taxes. It is prepaid at 8¢ a gallon on gasoline and 42.5¢ on diesel for July 2026–June 2027. There are no local per-gallon fuel taxes, but city and county district sales taxes add to the statewide sales tax rate.

The rate is due to be reset on July 1, 2027; the new figure is not published yet.

California Fuel Taxes (2026)

State Gasoline Tax 65.64¢/gal
State Diesel Tax 50.44¢/gal
Federal Excise Tax 18.4¢ gasoline / 24.4¢ diesel
Total per Gallon 84.04¢ gasoline / 74.84¢ diesel
Sales and Other Taxes on Fuel Sales tax also applies to fuel: 2.25% statewide on gasoline and 13% on diesel, plus local district taxes. It is prepaid at 8¢ a gallon on gasoline and 42.5¢ on diesel for July 2026–June 2027.
How the State Rate Is Built Gasoline: 63.4¢ excise tax + 2¢ underground storage tank fee + 0.236¢ oil-spill prevention fee. Diesel: 48.2¢ excise tax + the same two fees.
Next Change July 1, 2027: new rate not yet published

Official Sources:

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