# Road Trip Cost Calculator

Plan your road trip budget with this fuel cost calculator. Enter distance, MPG, and gas price to get total cost, cost per person, and estimated drive time.

## What this calculates

Planning a road trip? Calculate exactly how much gas you will need and what it will cost. Enter the total distance, your car's fuel efficiency, and the price of gas to get a complete breakdown, including cost per person if you are splitting expenses.

## Inputs

- **Trip Distance** (miles) — min 1, max 50000 — Total one-way driving distance.
- **Vehicle Fuel Efficiency** (mpg) — min 5, max 150 — Your vehicle's miles per gallon (or km per liter).
- **Gas Price** ($/gal) — min 0.5, max 10 — Average gas price along your route.
- **Passengers to Split Cost** — min 1, max 20 — Number of people splitting the fuel cost (including the driver)

## Outputs

- **Total Fuel Needed** (gal) — Total fuel required for the trip.
- **Total Fuel Cost** — formatted as currency — Total fuel expense for the trip
- **Cost per Person** — formatted as currency — Fuel cost split evenly among passengers
- **Estimated Drive Time** — formatted as text — Approximate driving time at highway speed.

## Details

Divide the trip distance by your vehicle's MPG to get gallons needed, then multiply by the gas price. The estimated drive time uses an average highway speed of 55 mph, which accounts for varying speed limits, traffic, and rest stops.

For round trips, either double your distance before entering it or run the calculator twice. Gas prices can vary significantly along a route, so using an average price from GasBuddy or a similar tool gives the most accurate estimate.

Splitting the cost among passengers makes road trips very economical. A 500-mile trip that costs $70 in gas comes down to just $17.50 each with four people, often beating the cost of a single airline ticket.

## Frequently Asked Questions

**Q: Should I use city or highway MPG?**

A: For road trips, highway MPG is most appropriate since the majority of driving is on highways. If your route includes significant city driving, use a number between your city and highway ratings.

**Q: Why is the average speed set to 55 mph?**

A: While highway speed limits are typically 65-75 mph, the effective average speed drops when you account for city portions, traffic, rest stops, fuel stops, and slower rural roads. 55 mph is a realistic overall average for planning.

**Q: How do I calculate a round trip?**

A: Simply double your one-way distance and enter that as the trip distance. For example, a 250-mile one-way trip would be entered as 500 miles for the round trip.

**Q: Does altitude affect fuel consumption?**

A: Yes, driving through mountains increases fuel consumption due to climbing. Expect 15-30% worse fuel economy on mountainous routes compared to flat terrain. Your MPG recovers somewhat on descents.

**Q: How much should I budget beyond fuel?**

A: Besides fuel, budget for food ($15-30/person/day), lodging ($80-150/night for hotels), tolls ($10-50 depending on the route), and an emergency fund. A good rule of thumb is to double the fuel cost for total trip expenses.

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Source: https://vastcalc.com/calculators/everyday/road-trip-cost
Category: Everyday Life
Last updated: 2026-04-21