A free gas trip calculator that prices a drive's fuel, splits it between friends and finds your real gas mileage.
Work out a trip's fuel cost, split it between friends, or find your real gas mileage.
Your numbers
Type the price at your pump.
Your result
Fill in the fields above to see your result.
Embed this tool on your site
Paste the code into any page: WordPress, Webflow, Squarespace, Ghost or plain HTML. It's free with the credit under it, which links back to navid.me.
This free gas trip calculator works out a road trip's fuel cost from the distance, your fuel economy and the price of gas, and splits it between everyone in the car.
It also finds your real gas mileage from a fill-up.
It works in miles, mpg and dollars a gallon, or in km, L/100 km and any currency a liter.
I built it because I've split a lot of road trips with friends, and the "you owe me about $40" math never quite added up. This makes it exact, and it shows how much a thirstier car would cost.
TL;DRKey takeaways
What is a gas trip calculator?
A gas trip calculator estimates the fuel a drive takes and what it costs. It needs 3 numbers: how far you're going, how much fuel your car uses, and what fuel costs.
This one is also a fuel cost calculator and a gas mileage calculator, since they answer the same questions.
How to use the gas trip calculator
You need the distance and your car's fuel economy.
To find your real mpg instead, switch to Gas mileage and type a fill-up.
A worked example
Here's the example the calculator loads when you press Try an example: 300 miles each way, there and back, at 28 mpg, split between 2 people.
600 miles ÷ 28 mpg = 21.4 gallons. At the US average of $4.47 a gallon, that's $95.68, or $47.84 each.
- Fuel economy
- 19.6 mpg
- Cost of the trip
- $136.68
- Fuel economy
- 26.1 mpg
- Cost of the trip
- $102.51
- Fuel economy
- 33.6 mpg
- Cost of the trip
- $79.73
- Fuel economy
- 47 mpg
- Cost of the trip
- $56.95
In km, 500 km each way at 7 L/100 km takes 70 L. At 1.80 a liter, that's 126, or 63 each.
Finding your real fuel economy
The number on the sticker is a test result, and your own driving gives the real one.
Fill up and reset
Fill the tank to the first click, and reset the trip meter.
Drive as normal
Drive until the tank is at least half empty.
Fill up again
Divide the miles by the gallons it took: 350 miles on 12 gallons is 29.2 mpg, or 8.1 L/100 km.
Mistakes to avoid
These are the ways a trip's fuel cost comes out low.
- Using the sticker mpg for a loaded car on the highway at speed
- Forgetting the drive home
- Leaving out tolls and parking, which aren't fuel but still get split
- Mixing US and UK gallons (a UK gallon is 4.55 liters, a US one 3.79)
Driving abroad, the currency converter turns the local price into yours, and the card fees abroad calculator shows what your card adds at the pump.
Who is the gas trip calculator for?
It's for road trips, commutes and anyone splitting a ride, and these tools help plan the rest.
- Currency converter – for fuel prices abroad
- Card fees abroad calculator – for what your card charges overseas
- Time zone converter – for arrival times across zones
- Electricity cost calculator – for charging at home instead
- Unit price calculator – for road-trip snacks at the best price
Work it out before you leave, and nobody argues about the gas money.
Plan your money with your AI
Take your numbers further in
Gas Trip Calculator FAQs
Questions about the gas trip calculator? Here's what to know.
A gas trip calculator works out a drive's fuel and its cost from the distance, your fuel economy and the price of fuel.
This free one splits the cost and finds your real mpg.
Divide the miles by your mpg for gallons, then multiply by the price a gallon.
600 miles at 28 mpg is 21.4 gallons, $95.68 at $4.47.
Divide the miles since your last full tank by the gallons it took to fill it again.
350 miles on 12 gallons is 29.2 mpg.
Divide 235.2 by the mpg.
28 mpg is about 8.4 L/100 km.
Regular was $4.47 a gallon in the week of September 28, 2026, by the US Energy Information Administration.
The calculator reads the latest weekly figure each day.
Divide the trip's fuel cost by the people in the car.
Add tolls and parking to the total first if you share those too.
Yes, switch to km and L/100 km, and pick your currency.
The price is then a liter.
A UK gallon is 4.55 liters and a US gallon 3.79, so the same car shows a higher UK mpg.
The gas mileage card shows both.
Yes, they answer the same question.
Google treats them as the same search, so it's 1 page here.
Yes, it's free with no sign-up.
It runs in your browser.
I did.
I'm Navid Moazzez, and I made the gas trip calculator as one of my free tools on navid.me.
More about me.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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