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TRAVEL · GAS + EVRoad Trip Gas Cost Calculator
Planning a drive with friends and wondering what it will actually cost? This road trip gas cost calculator adds up every leg of your route, works out the fuel from your car's MPG and the pump price, and splits the total fairly between everyone in the car — gas or electric, miles or kilometres, one-way or round trip.
- 100% free, no sign-up
- Multi-leg trips up to 8 legs
- Per-person cost split
- Gas + EV + US/metric units
One leg costs its miles divided by your MPG, times the price per gallon. The page does it for every leg and adds the legs up — that is the whole calculation.
Add everyone in the car, driver included, and the page shows what each person owes. No more guessing at the pump or awkward money talks after the trip.
Going home the same way? Flip on round trip and every leg doubles. Turn it off for a one-way drive or a different route home.
Switch to electric mode and the page uses your efficiency in miles per kWh and the charging price instead. The same legs, the same split, a different fuel.
Your trip
Gas mode uses MPG and the pump price. Electric mode uses efficiency and the charging price instead.
Distances, fuel and prices switch together — your trip stays the same, only the units change.
One leg per stretch of driving: home to the first stop, then stop to stop. Add as many as your route has (up to 8). The example below is one 320-mile leg — replace it with your own trip.
Your car's real average, not the sticker number — most cars get 25–30 MPG on the highway.
Use the price you expect to pay on the road, not today's price at home.
Most EVs do around 3–4 miles per kWh on the highway, less in winter.
Public fast charging is usually $0.35–$0.60 per kWh; home charging is much cheaper.
Count yourself too. The driver usually splits equally — see the fair-split note below.
Toll roads and parking, if you want them in the total.
Count the same route back home too. Turn it off for a one-way drive.
Please note: this is an estimate. Traffic, hills, air conditioning, roof boxes and driving style all move real fuel use away from the sticker MPG, and pump prices change daily — build in a small buffer before you promise friends an exact split.
How this road trip gas cost calculator works
Planning a gas cost calculator trip means answering three questions: how far, how thirsty is the car, and what does fuel cost. The page asks them in that order.
Add your legs
Enter each stretch of driving as its own leg — home to the first stop, then stop to stop. The example leg is 320 miles; replace it with your route, and add legs until the whole trip is covered.
Enter economy and price
For a gas car, that is MPG and the price per gallon. For an EV, it is miles per kWh and the charging price. Use your real average economy, not the sticker number, and the price you expect on the road.
Read the split
The results show total fuel, total cost, cost per mile and what each person pays. Add tolls if you want them in the total, flip on round trip for the drive home, and copy the summary to send to your group.
Splitting gas money without the argument
Most road-trip money arguments are not about the amount — they are about nobody having done the math before leaving. Do it first and the argument never starts.
The fair-split rule
Split the total equally, driver included. The driver is already giving the car, the driving and the risk of a ticket — making them also pay extra for fuel is how resentment starts. If the group feels the driver deserves a break for wear and tear, agree a smaller driver share before you leave, not at the pump.
Count every seat, including friends who join for one leg only — or run the page twice, once per group, if the passengers change halfway.
Why your real cost runs higher
Four things push real fuel use above the sticker MPG: traffic and idling, air conditioning, hills and headwinds, and a roof box or a fully loaded trunk. City stretches drink more than highway stretches, so a trip that mixes both will beat a pure-highway estimate.
Pump prices vary by state and by station too. The honest move is to price the trip at the highest price you expect to see, then enjoy it if the real total comes in lower.
Worked examples
Three real trips, worked through the same formula. The first is the classic weekend drive; the second is the family version with a split.
| Trip | Distance | Fuel used | Total cost | Each pays |
|---|---|---|---|---|
| Los Angeles to Las Vegas — 30 MPG, $3.80/gal | 270 miles | 9.0 gallons | $34.20 | — (solo) |
| Family road trip, 3 legs — 28 MPG, $3.50/gal, 4 people | 710 miles | 25.4 gallons | $88.75 | $22.19 |
| EV road trip — 3.2 mi/kWh, $0.42/kWh | 900 miles | 281.3 kWh | $118.13 | — (solo) |
Example 1: 270 miles divided by 30 MPG is 9.0 gallons, times $3.80 is $34.20 for the drive. Example 2: three legs of 320, 180 and 210 miles add up to 710 miles; divided by 28 MPG that is 25.4 gallons, times $3.50 is $88.75, and split four ways that is $22.19 each. Example 3: an EV doing 900 miles at 3.2 miles per kWh needs 281.3 kWh, times $0.42 is $118.13 — cheaper than gas for the same distance, but the charging stops take longer.
Road trip cost questions, answered
Is this the same as a gas calculator road trip tool?
Yes — people search for it as a gas calculator road trip tool, a gas cost calculator trip planner, and a road trip gas cost calculator, and they all mean the same thing: a page that turns your route, your car's economy and the fuel price into a trip total and a fair per-person split. This page does all of that, for gas and electric cars.
How do I split gas money fairly?
Add up the whole trip's fuel cost, add tolls if you agreed to share them, and divide by the number of people in the car — driver included. This page does that division for you. If the driver is also covering wear on their own car, agree a smaller driver share before the trip, not at the pump.
Should I use MPG or litres per 100 km?
Whichever your car reports. US drivers usually think in MPG; metric drivers think in litres per 100 km, where a lower number is better. Switch the units toggle and the page converts everything — your trip stays the same, only the units change.
Does it work for electric cars?
Yes. Switch to electric mode and enter your efficiency in miles per kWh (or kWh/100km in metric mode) and your charging price. The page works out the kilowatt-hours for the trip and the charging cost, with the same per-person split.
Why did my real trip cost more than the estimate?
Four usual reasons: traffic and idling, air conditioning, hills and headwinds, and a loaded roof box or trunk — all push real economy below the sticker MPG. Pump prices also vary by state. Price the trip at the highest fuel price you expect, and treat the estimate as a floor, not a promise.
What if our route home is different?
Then leave round trip off and add the return route as extra legs. Round trip mode doubles every leg, which is only right when you drive the same road back.