Your road trip
Gas Split Calculator
Carpooling with different friends on the way there and back? Enter each leg, tap who was in the car, and everyone pays their fair share of fuel.
Currency
Units
People
Everyone who traveled — you’ll pick who rode in each car below.
Legs
One leg per car journey. Different people in different cars? Add a leg for each.
No legs yet. Tap Add leg to split your first trip.
Each person’s share
Total fuel
$0.00
Add people, legs, and fuel costs to see each person’s share.
How it works
One leg per car journey. Split each leg among the people in that car.
Four friends drive from the city to the cabin in one car. On the way back, two of them leave early with a third friend who just arrived, and the other two ride home with someone else. Nobody can remember who owes whom for gas.
The trick is to stop thinking of it as “the trip” and start thinking of it as separate legs. Each leg has one car, one tank of gas, and a specific set of people in it. That leg’s fuel cost splits evenly among the people who were actually riding.
Each person’s total is just the sum of the legs they rode in. If you track who paid at the pump, the calculator also tells you the minimum payments needed to settle up — no chain of “wait, but you already paid me for…”
Per-leg fairness
Different people in different cars each way? Each leg splits only among the passengers in that car. Nobody pays for a ride they weren't on.
Cost or distance
Enter the receipt total, or compute fuel cost from distance, MPG or L/100km, and the pump price. Works for planning and post-trip.
Who paid, who owes
Track who actually paid at the pump. Get the minimum number of payments needed so everyone's square.
Private by default
Runs entirely in your browser. Your trip, people, and receipts are never sent anywhere. Saved to local storage.
Frequently asked questions
How do you split gas when different people were in different cars each way?
Treat each car journey as its own leg. A leg has a fuel cost and a list of who was in that car, and the cost splits equally among those passengers. A round trip where four friends drove out in one car, then three of them drove back with a new fifth person, is two legs — the outbound cost splits four ways, the return splits four ways (among the actual passengers), and each person's total is the sum of the legs they were in. This calculator does that math automatically.
What if someone drove but didn't pay for the gas?
Driving and paying are separate. Use the 'Paid for fuel' dropdown on each leg to record who actually put money in at the pump — that affects the settle-up but not the per-person share. If multiple people chipped in on a single fill, either average it or add a separate leg for each chip-in.
Should the driver pay less because it was their car?
That's a judgment call. Strictly speaking, fuel is a per-trip cost and drivers consume fuel just like passengers, so splitting equally among everyone in the car — driver included — is fair. If you want to give the driver a discount for wear and tear, subtract their share manually or exclude them from the passenger list on that leg.
Can I calculate the fuel cost from distance instead of a receipt?
Yes. Switch a leg to 'From distance' and enter kilometers (or miles), the car's fuel efficiency (L/100km or MPG), and the pump price. The tool calculates the fuel cost for that leg and splits it among the passengers. Useful for planning a trip before it happens or when nobody kept the receipt.
What about tolls and parking?
This tool focuses on fuel. Tolls and parking usually get split either equally among passengers on the leg they happened on, or charged to whoever benefited. If your trip has a lot of non-fuel costs, use the Group Trip Settler — it handles arbitrary expenses with per-expense payers and splits.
Does this save my trip?
Yes, in your browser's local storage. Close the tab, come back later, everything is still there. Nothing is sent to a server.
supasplitGas is one line item. A whole road trip is a hundred.
Supasplit tracks every fill-up, toll, Airbnb night, meal, and round of drinks across every friend on the trip. Multi-currency, no spreadsheets, everyone settles up in two taps. Free to start.