Example: Trip distance: 300 mi · Fuel economy: 28 mpg · Gas price: 3.4 $/gal → Trip fuel cost: $36.43.
Gallons used: 10.7
Cost per mile: $0.12
Frequently asked questions
How do I calculate fuel cost? Enter your numbers above and the result updates instantly. For example: Trip distance: 300 mi · Fuel economy: 28 mpg · Gas price: 3.4 $/gal → Trip fuel cost: $36.43.
Is this Fuel Cost Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for fuel cost. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.