Last updated: March 2026
What Is a Road Trip Calculator?
A road trip calculator is a planning tool that estimates the total fuel cost of a multi-stop journey based on your vehicle's fuel efficiency, gas prices, and the distance between each stop. It helps you budget for long-distance drives by breaking the trip into segments with individual cost estimates.
Road trips remain one of the most popular and affordable ways to travel in the United States. Americans took over 2.3 billion road trips in 2025, with the average trip covering 284 miles round trip. Knowing your fuel cost before you leave eliminates budget surprises and helps you plan better stops along the way.
How to Plan Your Road Trip Fuel Budget
Step 1: Map out your route and stops. Decide where you'll stop for gas, food, sleep, or sightseeing. Use the Road Trip tab to add each stop in order. Name your stops so the breakdown is easy to read.
Step 2: Enter distances between stops. Use Google Maps or your navigation app to find the mileage between each consecutive pair of stops. Enter these distances in the calculator for each leg.
Step 3: Set your vehicle's MPG and gas price. Use a vehicle preset or enter your car's actual fuel efficiency. Set the gas price to what you expect to pay along your route — prices vary by state, so use an average or check GasBuddy for route-specific pricing.
Step 4: Review per-leg and total costs. The calculator shows you exactly what each segment will cost in fuel, plus the total for the entire trip. Add 10–15% as a buffer for detours and city driving.
Step 5: Compare with alternatives. Use the Gas vs Electric tab to see what the same trip would cost in an EV, or compare different vehicle MPGs to decide which car to take.
Key Features
Multi-stop route planning. Add as many stops as your trip requires — overnight stays, gas stations, attractions, or rest stops. The calculator handles routes with 2 stops or 20, showing you the cost for each leg so you can plan daily driving budgets.
Per-leg cost breakdown. Instead of just a total number, you see exactly how much each segment of your trip costs. This is invaluable for planning which days will be the most expensive driving days and where to look for cheaper gas.
Quick vehicle presets. Tap a vehicle type to instantly set realistic MPG values. If you're deciding which car to take on the trip (say, the fuel-efficient sedan vs. the spacious SUV), compare the cost difference in seconds.
Complete fuel budget. The total trip summary shows total miles, total gallons needed, and total fuel cost at a glance. Use this number alongside lodging, food, and activity costs to build a complete road trip budget.
Popular US Road Trip Routes and Gas Costs
The Pacific Coast Highway (San Francisco to Los Angeles, ~380 miles) costs approximately $53 in gas at 25 MPG and $3.50/gallon. The route offers stunning ocean views but includes winding coastal roads that reduce fuel efficiency below highway averages.
Route 66 (Chicago to Santa Monica, ~2,400 miles) runs about $336 one-way in a typical sedan. Gas prices along the route vary dramatically — from under $3.00 in Oklahoma and Texas to over $5.00 in parts of California.
The Blue Ridge Parkway (469 miles through Virginia and North Carolina) costs roughly $66 in fuel, but the 45 mph speed limit and mountainous terrain mean your actual MPG will be 15–20% lower than highway ratings. Budget for about $75–$80 to be safe.
Frequently Asked Questions
How much gas will I need for a road trip?
Divide your total trip distance by your car’s MPG. A 1,000-mile road trip in a car averaging 25 MPG needs 40 gallons. At $3.50/gallon, budget $140 for fuel. Add 10–15% for detours, wrong turns, and driving in traffic.
How do I calculate gas cost for a road trip with stops?
Use the Road Trip tab to add each stop along your route. Enter the distance between consecutive stops, and the calculator will show you the gas cost for each leg plus the total trip cost. This helps you budget for each day of driving.
What is the cheapest day to buy gas for a road trip?
Gas prices tend to be lowest on Mondays and Tuesdays and highest on Thursdays and Fridays (when weekend travelers fill up). However, the difference is usually only $0.05–$0.10 per gallon. Location matters more: gas stations near highways charge 10–30 cents more than stations a mile off the exit.
How much does a cross-country road trip cost in gas?
A coast-to-coast US road trip is roughly 2,800 miles (New York to Los Angeles). At 25 MPG and $3.50/gallon, one-way fuel cost is about $392. Round trip: $784. In a fuel-efficient hybrid at 48 MPG, the same round trip costs about $408.
Should I fill up before or during a road trip?
Fill up before departing to avoid highway-adjacent stations that charge a premium. During the trip, fill up when you reach half a tank rather than waiting until near-empty. Use GasBuddy or similar apps to find the cheapest stations along your route — prices can vary by $0.50+ per gallon between stations just a few miles apart.
How do I save money on gas during a road trip?
Drive at 60–65 mph (fuel economy drops sharply above 65), use cruise control on flat highways, avoid heavy braking and rapid acceleration, keep tires properly inflated, and fill up at stations away from highway exits. These habits can reduce fuel costs by 20–30% on a long trip.