Someone always asks, "How much will this drive cost?" right before a road trip. The honest answer is usually a shrug and a guess. A fuel cost calculator ends the guessing. Type in your distance, your car's fuel economy, and today's fuel price, and the exact number lands in front of you before you've even left the driveway.
Quick Answer: Fuel cost equals distance divided by fuel economy, multiplied by the price per gallon. A 250-mile drive at 30 MPG and $3.95 per gallon costs $32.92.
Supported Units: MPG, L/100km, km/L.
Supported Currencies: USD, CAD, AUD, GBP, EUR.
Your Results: Fuel Cost, Cost Per Mile, Fuel Used, Cost Per Passenger.
How This Fuel Cost Calculator Works
A fuel cost calculator turns your trip distance, fuel economy, and fuel price into an exact cost in seconds. Enter your distance in miles or kilometres, your MPG or L per 100km, and today's price per gallon or litre. The tool divides distance by economy to find fuel used, then multiplies by price. A 250 mile drive at 30 MPG and $3.95 a gallon costs $32.92.
Who This Calculator Is For
Anyone planning a road trip wants this number before they leave, not after the fuel light comes on somewhere unfamiliar. Rideshare drivers pricing out whether a trip is worth accepting run the same math. Parents splitting a family drive, or friends splitting gas on a group trip, use it to work out who owes what.
Common Uses
People reach for this calculator for more than just weekend drives. Road trips and vacation planning are the obvious ones. Business mileage tracking, delivery route budgeting, a daily commute, and even estimating fuel for a house move all lean on the same simple math.
How To Calculate Fuel Cost
Enter your trip distance in miles or kilometres. Enter your car's fuel economy in MPG, L/100km, or km/L. Enter today's fuel price in your currency. The calculator handles the rest.
Fuel Cost Formula
Distance divided by fuel economy gives fuel used. Fuel used multiplied by price per gallon gives total cost.
Example
A 250 mile drive in a car averaging 30 MPG needs 8.33 gallons. At $3.95 a gallon, that comes to $32.92 for the trip, or about $0.132 per mile
One Way Vs Round Trip Cost
A distance you glance at on a map rarely accounts for the drive back, and that gap catches people out more than any other mistake on this page. A 100-mile one-way trip runs about $14.10 in fuel. Please double it for the round trip; you're at $28.20, not $14.10 again by mistake. A 450-mile weekend getaway comes to roughly $63.45 round trip, and a full 1,200-mile road trip lands near $169.
Fuel Cost By Fuel Type
This calculator works for petrol, diesel, and hybrid vehicles, since the formula only cares about fuel economy and price, not what's actually being burned. Diesel typically returns better MPG than an equivalent petrol engine, so the same trip often costs less even at a slightly higher price per gallon. Hybrids can cut trip costs by 30 to 40 percent compared to a similar petrol car. Fully electric vehicles swap gallons for kilowatt-hours, making them better suited to our EV vs petrol calculator instead.
Cost Comparison Between Vehicles
100-mileThe same 100 mile trip costs very different amounts depending on what you're driving. A compact car at 35 MPG runs about $11.29. An SUV at 24 MPG climbs to roughly $16.46. A pickup at 18 MPG reaches close to $21.94, while a hybrid at 50 MPG drops all the way down to $7.90 for the identical distance.
Gas Cost Calculator For US Drivers
This fuel cost calculator doubles as a gas cost calculator for US drivers. Gas cost equals your trip distance divided by your car's MPG, multiplied by the price per gallon. A 300-mile drive at 25 MPG and $3.95 a gallon uses 12 gallons and costs $47.40 in gas. Enter your own numbers above for an exact figure for your car and route.
Annual Fuel Cost Estimator
A single trip cost matters less than what driving actually costs you over a year. At 30 MPG and $3.95 a gallon, 5,000 annual miles run about $658. That climbs to $1,317 at 10,000 miles, $1,975 at 15,000 miles, and $2,633 at 20,000 miles. Small MPG gains matter more the higher your annual mileage climbs.
How Sensitive Your Cost Is To Fuel Prices
Fuel prices swing faster than most people track, and it moves your total more than they expect. A 300 mile trip at $3.50 a gallon costs about $35. The same trip at $4.50 a gallon jumps to $45, a $10 difference from price alone, nothing about the drive itself. Checking a current local price before a long trip is worth the extra minute.
Fuel Units Around The World
The unit on your dashboard depends entirely on where you are. The US and UK both use MPG, though the two gallons are sized differently. Canada, Australia, and most of Europe run on L/100km. Japan, India, and Pakistan commonly use km/L, sometimes written out as kilometres per litre.
Example Trips
Seeing a few common trip types worked out in dollars makes the number easier to use right away. A daily commute of 30 miles round trip costs around $4.23 at 30 MPG. A weekend getaway of 450 miles runs close to $63.45. A family vacation covering 1,400 miles costs nearly $197.40, and an airport run of 40 miles costs roughly $5.64.
What Good Fuel Economy Looks Like
Context helps once you've got a number in hand. Above 40 MPG counts as excellent for a standard petrol car. 30 to 40 MPG is good, 22 to 30 MPG is average, and anything under 22 MPG sits on the poor end for a typical sedan.
What This Actually Costs You Compared To Other Trips
A number on its own doesn't mean much until it's next to something familiar. That same $32.92 trip costs roughly the same as a mid-range restaurant meal for two, or four months of a basic streaming subscription. Seeing fuel cost next to an everyday expense makes it easier to decide whether a trip, or a longer commute, is actually worth it.
Splitting Cost Between Passengers
A $33 trip feels different once it's split four ways. Divide the total fuel cost by however many people are riding along, and $33 becomes $8.25 per person for a car of four. This calculator does that division automatically once you enter the passenger count.
What Else You Should Budget For
Fuel is rarely the only cost on a real trip. Tolls, parking, food, and accommodation on a longer drive can add up to more than the fuel itself. General wear on the vehicle, tyres, brakes, oil, also climbs with extra mileage, even if it doesn't show up until later.
Factors That Affect Your Actual Cost
Fuel price is the most obvious variable, but it's rarely the only one that moves your final number. Traffic, terrain, and driving speed all shift how much fuel a trip actually burns, even at the same distance. Weather, a roof rack, and towing a trailer all add drag or resistance the engine has to work against. Low tyre pressure, extra vehicle load, running the AC, driving with windows open, and unnecessary idling all quietly add to the total too.
Ways To Lower Your Trip Cost
Checking prices at two or three nearby stations before filling up often saves more than people expect. Keeping tyres properly inflated and driving at a steady speed both improve real-world MPG. Combining errands into one trip instead of several short ones cuts down on the extra fuel cold starts burn.
Fuel Prices Change, This Formula Doesn't
Fuel prices vary by country, season, and local taxes, so no single number stays accurate for long. Always plug in the latest local price for the most accurate estimate, rather than relying on whatever you remember from last month. The formula itself never goes out of date, only the price you feed it does.
Common Mistakes
Using the manufacturer's rated MPG instead of real-world MPG understates the true cost. Forgetting to update the fuel price before a long trip throws off the whole estimate. Calculating one-way cost and forgetting to double it for a round trip is an easy one to miss.
Related Calculators
The Fuel Consumption Calculator covers the full picture, trip cost, monthly cost, and comparisons between vehicles in one tool. The Trip Fuel Calculator is built specifically for splitting a route between passengers. The MPG Calculator helps you find your real-world fuel economy before you rely on it here. The Fuel Unit Converter, L/100km Calculator, and km/L Calculator cover metric units directly. For commercial and specialty use, the Truck Fuel Calculator, Boat Fuel Calculator, Generator Fuel Calculator, and Fleet Fuel Calculator apply the same thinking elsewhere.
Frequently Asked Questions
Methodology
Fuel cost here runs on the standard distance-over-efficiency relationship, distance divided by MPG, multiplied by price per gallon. The calculation assumes the distance, fuel economy, and price you enter are accurate for your specific trip. It does not include tolls, parking, or general vehicle maintenance. Reference pricing draws on AAA's national average gas price data, updated regularly to reflect current conditions. The FuelConsumptionCalc Editorial Team last reviewed this page in July 2026.