Calculate how much your road trip will cost in fuel based on distance and MPG.
How much will your trip cost in fuel?
This free calculator gives you instant, accurate results with no signup required. Use it to make smarter, more informed financial and life decisions.
Always double-check important financial decisions with a qualified professional. This calculator provides estimates for guidance purposes. Results may vary based on your specific circumstances.
Fuel cost estimates often go wrong because people use their car's advertised MPG rather than real-world MPG, which is typically 10-20% lower due to highway speed, air conditioning use, cargo weight, and terrain — especially on long road trips through varied conditions.
Highway driving at consistent speed is more fuel-efficient than city stop-and-go traffic, but driving above 60-65 mph starts reducing efficiency due to air resistance increasing exponentially with speed — meaning that rushing a road trip can meaningfully increase your fuel costs beyond just the obvious risk factors.
Don't forget round-trip costs when budgeting — many people calculate one-way fuel costs and then are surprised when the actual trip costs double. Building in a buffer for fuel price fluctuations along the route (prices can vary 20-30% between regions) also prevents budget surprises.
Use the calculator above with your vehicle's realistic MPG (check recent fill-ups rather than the sticker estimate) to get an accurate fuel budget for your next trip, including the full round-trip cost most people forget to calculate.