Road Trip Gas Cost Calculator

How this calculation works

Gas is usually the biggest variable cost on a road trip. The calculator gives you a reliable estimate — but remember that gas prices fluctuate by region and season. Check GasBuddy or AAA for current prices along your route.

Pro tip: fill up at regular gas stations just off the highway, not at interstate exits. Prices near exits are typically 10-20¢ more per gallon.

How this Road Trip Gas Cost Calculator works — 2026 guide

Gas is usually the single biggest variable cost on a US road trip — a 1,000-mile drive at 30 MPG and $3.20/gal costs about $107, while the same trip in an 18-MPG truck runs closer to $178. This 2026 road trip gas calculator multiplies distance ÷ MPG × price per gallon for you, with separate EPA city and highway fuel economy inputs so the estimate matches how you actually drive. Prices shift by region and season, so pair the result with current prices from the EIA or AAA along your route.

How to use it in 3 steps

1. Enter the total trip distance (one-way or round-trip).
2. Enter your car's MPG — use the EPA combined or highway rating for road trips.
3. Enter the average gas price per gallon; read your total fuel cost instantly.

Who this is for

Road-trippers building a trip budget, families comparing fuel costs between vehicles, and anyone deciding drive vs fly. Pair it with the [how to calculate gas cost for a road trip guide](/blog/how-to-calculate-gas-cost-for-a-road-trip/), the [commute gas cost estimator](/blog/commute-daily-gas-cost-monthly-estimate/), and the [vacation expense calculator](/tools/vacation-expense-calculator/) for the full trip total.

Data sources & authoritative references

This calculator is built on official U.S. rules and published statistics. Key sources:

• U.S. EIA — Weekly Gasoline & Diesel Prices
• EPA — fueleconomy.gov (official MPG ratings)