Gas Cost Calculator

Enter the trip distance, your car's mpg and the gas price and get the fuel cost for the trip, one way or round trip, split by riders.

Money & PricesWorldwideSource: Fuel arithmetic; optional OSRM road distanceFree, no sign-up

Optional: get the driving distance

Units

Distance one way (mi)

Fuel economy (mpg)

Gas price ($ per gallon)

People sharing the cost

Round trip

Highway mpg suits a long road trip; city mpg suits stop-and-go driving. Your car's own trip computer beats both.

250 mi

$28.57 in fuel

8.93 gallons · $0.11 per mi

What this page cannot tell you

Real fuel use changes with speed, load, air conditioning, terrain, traffic and tyre pressure. Tolls, parking and wear on the car are not included. Fuel prices change daily and by station.

How to work out the gas cost of a trip

Get the distance. Type it, or enter start and destination and press Get distance.
Enter your car's fuel economy. Miles per gallon, or L/100 km in metric mode.
Enter the gas price. Per gallon or per litre.
Choose round trip and riders. The result shows the total and each person's share.

10 trips where knowing the fuel cost helps

Splitting gas with friends

Four friends driving to a festival split the fuel cost fairly.

Road trip budgets

A family budgets fuel for a week-long drive.

Driving versus flying

A traveller compares the fuel cost of driving with airfare.

Commuting

A worker prices a daily commute by car.

Carpool payments

A driver works out what to ask carpool riders to chip in.

Moving with a rental truck

Someone moving checks the fuel for a truck with low mpg.

Comparing two cars

A family sees how much a more efficient car saves on a trip.

Business mileage

A contractor estimates fuel for a job site visit.

College move-in

Parents price the drive to campus and back.

Holiday visits

Someone plans the fuel for a holiday trip to relatives.

How the fuel cost is worked out

Fuel = distance ÷ mpg (or distance × L/100 km ÷ 100); cost = fuel × price; each share = cost ÷ people. Round trip doubles the distance.

The optional distance lookup finds both places with Photon (OpenStreetMap) and the road route with OSRM on the FOSSGIS servers, over OpenStreetMap roads.

Limits: real fuel use changes with speed, load, air conditioning, hills, traffic and tyre pressure. Tolls, parking and wear are not included. Fuel prices change daily.

Sources

Frequently asked questions

How do I calculate gas cost for a trip?

Divide the distance by your car's mpg to get gallons, then multiply by the price per gallon.

How much gas for 300 miles at 30 mpg?

10 gallons. At $3.50 a gallon, $35.

Should I use city or highway mpg?

Highway mpg suits long trips at steady speed; city mpg suits stop-and-go driving.

Does it work in kilometres?

Yes. Switch the units to kilometres, L/100 km and price per litre.

How do I split gas money fairly?

Enter the number of people sharing; the page divides the total evenly.

Is the driving distance exact?

It is the OSRM route over OpenStreetMap roads; your own route may differ.