What is Oklahoma's gas tax per gallon?

Oklahoma charges a $0.19 per gallon gasoline excise tax plus roughly $0.01 in per-gallon assessment fees, for about $0.20 in state tax per gallon. On top of that the federal excise adds $0.184, making about $0.384 combined per gallon.

Is the gas tax added at the pump or at checkout?

The fuel tax is built into the advertised price per gallon, not added separately at checkout. The price you see on the pump sign already includes both the state and federal excise taxes.

How do you turn miles into gallons of tax?

The tool divides your annual miles by your fuel economy (MPG) to get gallons burned per year, then multiplies that by the combined per-gallon tax rate. So 12,000 miles at 25 MPG is 480 gallons of taxed fuel.

Does this include diesel fuel?

No. This calculator covers gasoline only. Oklahoma taxes diesel at a different per-gallon rate, so heavy-duty and diesel vehicles should use the diesel rate rather than the gasoline figure shown here.

Why does a fuel-efficient car pay less gas tax?

Gas tax is charged per gallon, not per mile. A car that gets more miles per gallon burns fewer gallons for the same distance, so it pays less total fuel tax over a year of driving.

Oklahoma Gas Tax Calculator

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Every gallon of gasoline you buy in Oklahoma includes state and federal fuel taxes baked into the pump price. This calculator breaks out how much tax you pay per fill-up, across a year of driving, and per mile, so you can see the real cost of the fuel tax.

How it works

Oklahoma and the federal government each levy a per-gallon excise tax:

Oklahoma state tax ≈ $0.19 excise + $0.01 fees = $0.20 per gallon
Federal excise     = $0.184 per gallon
Combined           ≈ $0.384 per gallon

Annual gallons = annual miles ÷ MPG
Annual gas tax = annual gallons × combined per-gallon rate

Because the tax is per gallon, a more fuel-efficient vehicle burns fewer gallons for the same mileage and therefore pays less total gas tax over the year.

Example

Driving 12,000 miles a year at 25 MPG burns 480 gallons. At about 0.384 dollars of combined tax per gallon, that is roughly 184 dollars of gas tax for the year, or about 1.5 cents of tax per mile. A single 14-gallon fill-up carries about 5.38 dollars of fuel tax.

Notes

This estimate covers gasoline only — diesel is taxed at a different rate. The fuel tax is included in the pump price, not added at checkout. Verify current rates at the Oklahoma Tax Commission, oklahoma.gov/tax.