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Fuel Cost & Road Trip Gas Calculator

Estimate fuel usage and trip costs based on vehicle mileage, gas prices, and passenger splits for road trips, commutes, and ride-shares.

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Last updated: September 7, 2026

Trip & Vehicle Parameters

Trip Distance

miles

Round Trip (Double distance: 350 miles)

Fuel Efficiency (Miles Per Gallon (MPG))

Fuel Price ($/ gallon)

Split with Passengers1 person

Total Estimated Fuel Expense

$45.63

Fuel Consumed

12.5 gallons

Cost per Mile

$0.13 /mi

Based on 350 miles at 28 MPG and $3.65 per gal.

How to Calculate Road Trip Fuel Cost

To calculate your vehicle's total gas cost for any road trip:

Gallons Needed = Distance (miles) ÷ MPG

Total Cost ($) = Gallons Needed × Price per Gallon

Metric L/100km Formula

In metric countries, fuel economy is measured in liters per 100 kilometers:

Liters Needed = (Distance in km ÷ 100) × L/100km Rating

How to Use Fuel Cost & Road Trip Gas Calculator (Step-by-Step)

Enter trip distance in miles or kilometers.

Select vehicle fuel economy (MPG or L/100km).

Input current gas price per gallon or liter.

Toggle round trip and select passenger count to see individual cost splits.

Applications

Common Use Cases

Estimate total gas expense before embarking on a road trip.
Split fuel expenses fairly among carpool members and friends.
Compare fuel costs between different vehicles with varying MPG ratings.

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Your data never leaves your device and cannot be viewed, stored, or harvested by anyone.

Companion Step-by-Step Guide

How to Calculate Road Trip Fuel Costs: Distance, MPG & Gas Split Guide

A complete guide to calculating road trip gas expenses using distance, vehicle MPG or metric L/100km, fuel prices, and passenger expense splits.

Read Full Guide

FAQ

Frequently Asked Questions

How is road trip gas cost calculated?

Gallons Needed = Distance (miles) ÷ MPG. Total Fuel Cost = Gallons Needed × Price per Gallon.

How does metric L/100km calculate fuel consumption?

Liters Needed = (Distance in km ÷ 100) × L/100km rating.

Does city driving affect gas cost?

Yes. City stop-and-go driving typically lowers MPG by 15% to 30% compared to highway cruising speeds.

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