Gas vs Diesel Cost Calculator – Compare Fuel & Ownership Costs
Free gas vs diesel calculator. Enter your mileage, fuel prices, and vehicle premium to see annual savings, cost per mile, and your diesel break-even point.
Compare fuel costs, annual savings, and five-year ownership costs.
Your Driving
Gasoline Vehicle
Diesel Vehicle
Cost Comparison
Estimates are for comparison purposes only. Actual fuel economy, fuel prices, maintenance costs, taxes, and driving conditions may vary.
How It Works
The calculator multiplies your annual mileage by each fuel’s cost-per-mile (price ÷ MPG) to project yearly fuel spend, then adds any diesel purchase premium and maintenance savings to show your true cost difference over your ownership period. It also runs the math in reverse to estimate the mileage at which a diesel’s higher upfront cost gets paid back by its lower running costs.
FAQ:
The numbers are estimates based on the fuel economy, prices, and costs you enter. Real-world results can shift with driving style, terrain, weather, and regional fuel price swings, so treat this as a planning tool rather than a guarantee.
This is the extra amount a diesel version of the vehicle costs compared to the gas version at the time of purchase. You can usually find this by comparing trim-level MSRPs for the same model.
It’s the point at which your accumulated fuel and maintenance savings from the diesel vehicle equal the extra amount you paid upfront for it. Drive past that mileage and the diesel starts saving you real money; stay under it and the gas version was the cheaper overall choice.
Not directly — the formulas here are built around price-per-gallon and MPG, which don’t apply to electricity costs or kWh/mile ratings. A separate calculator using cost-per-kWh would be needed for that comparison.
