Fuel Cost Calculator
Calculate how much gas your trip will cost. Enter distance, MPG, and fuel price for total cost, gallons needed, cost per mile, and per-person split.
Quick Scenarios
Tap a scenario to autofill the calculator.
Estimates based on the values you enter. Actual fuel cost varies with driving conditions, traffic, terrain, and real-time gas prices.
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How Much Will Gas Cost for My Trip?
Whether you're planning a cross-country road trip or budgeting your daily commute, knowing your fuel cost upfront helps you plan and split expenses fairly. This fuel cost calculator estimates the total gas cost of any trip from three things: the distance, your vehicle's fuel efficiency, and the current price of fuel. It works in both US and metric units (miles or kilometers, MPG or L/100km, dollars per gallon or per liter), handles one-way and round trips, splits the cost among passengers, and can project a recurring commute into weekly, monthly, and yearly totals.
What Is a Fuel Cost Calculator?
A fuel cost calculator estimates how much you'll spend on gas for a trip by combining the distance you'll drive, your car's fuel economy, and the price of fuel. The math is simple — divide the distance by your miles per gallon to get the gallons needed, then multiply by the price per gallon — but this calculator goes further: it converts between units automatically, doubles the distance for round trips, divides the total among travelers so everyone pays their share, and turns a regular commute into an annual fuel budget.
Formula
Total Cost = (Distance ÷ MPG) × Price per GallonHow to Use This Fuel Cost Calculator
Choose one-way or round trip — round trip doubles the distance automatically.
Enter the trip distance in miles or kilometers.
Enter your vehicle's fuel efficiency (MPG, L/100km, or km/L).
Enter the current fuel price per gallon or per liter.
Optionally set the number of travelers to split the cost, and trips per week to project recurring cost.
Review the total cost, fuel needed, cost per mile, per-person split, and the efficiency comparison chart.
Common Use Cases
Planning a Road Trip
Estimate gas for a long drive and compare it to flying or other options.
Splitting Gas Money
Figure out exactly how much each passenger owes for a carpool or group trip.
Calculating Commute Cost
See what your daily drive to work really costs per week, month, and year.
Comparing Two Cars
Check how much a higher-MPG vehicle would save on the same routes.
Budgeting in Metric
Plan fuel costs abroad using kilometers, L/100km, and price per liter.
RV and Truck Trips
Estimate fuel for low-MPG vehicles where gas is a major share of trip cost.
Why Use a Fuel Cost Calculator?
Budget Your Road Trip
Know the exact fuel cost before you leave so gas money doesn't blow your travel budget.
Split Gas Fairly
Divide the total among everyone in the car so each passenger pays their fair share — no awkward math at the pump.
See Your True Commute Cost
Turn a daily drive into a weekly, monthly, and yearly fuel total — often a surprising number that helps with job and housing decisions.
Compare Fuel Economy
The efficiency chart shows how much a more fuel-efficient car would save on the same trip.
Works in Any Units
Switch between miles and kilometers, MPG and L/100km, and dollars per gallon or per liter — useful for travel anywhere.
Frequently Asked Questions
Divide the trip distance by your vehicle's miles per gallon (MPG) to find how many gallons you'll need, then multiply by the price per gallon. For example, a 350-mile trip in a car that gets 28 MPG with gas at $3.50 per gallon needs 12.5 gallons and costs $43.75. For a round trip, double the distance first.
It depends on your fuel economy and gas price. At 30 MPG and $3.50 per gallon, a 500-mile one-way trip uses about 16.7 gallons and costs around $58. A 500-mile round trip (1,000 miles) would be about $117. A less efficient vehicle at 20 MPG would cost roughly 50% more.
Calculate the total fuel cost for the trip, then divide by the number of people in the car, including yourself. For a $60 trip with 4 people, each person's fair share is $15. This calculator does the split automatically when you enter the number of travelers.
Multiply your round-trip commute distance by trips per week, then by the gas needed and price. For example, a 30-mile round-trip commute at 28 MPG and $3.50/gal driven 5 days a week costs about $7.50 per day, $37.50 per week, and roughly $1,950 per year. Enter trips per week to see the projection.
Divide 235.21 by the MPG figure. For example, 30 MPG equals 235.21 ÷ 30 = about 7.8 L/100km. This calculator converts automatically — just pick your preferred efficiency unit and it handles the rest.
Yes. A round trip covers the distance twice — there and back — so the fuel used and the cost both double compared to a one-way trip. Select Round Trip and the calculator doubles the distance for you before computing the cost.