How to split gas money by distance
Fuel is the expense that starts most road-trip arguments, because there are three reasonable ways to split it and everyone in the car picks a different one. Splitting by distance is the fairest when people join for different stretches or share a car through the week. This guide shows the three ways, the arithmetic for each, and how to record it so the settle-up at the end is one short list.
Three fair ways to split fuel
- Evenly. Everyone was in the car the whole way, so everyone pays the same part of every fill-up. Simple and right for most road trips.
- By distance. People joined for different legs, or each person uses a shared car for their own trips. Each person pays in proportion to the distance they travelled.
- By passenger, with the driver free. Some groups let the driver off fuel because they did the driving. That is a group decision, not arithmetic; agree it before the first fill-up.
The arithmetic for a split by distance
Each person's part of the fuel is their distance divided by everyone's distance added together.
Worked example: two people share a car for a month. One drives 600 km and the other 300 km, so 900 km in total. The first pays 600 / 900, two thirds of the fuel, and the second pays one third. A fill-up of 90 becomes 60 and 30. Miles work exactly the same way as kilometres.
On a road trip where someone joined halfway, count the distance each person was in the car, not the distance they drove.
Splitting the fuel in Splitsheet
Start a sheet for the trip or the car and send the link to everyone who uses it. When someone fills up, they add it with "By shares" and type each person's kilometres or miles as their share. Decimals and commas are fine. The percentage for each person shows next to their name before you save.
If the shares stay the same for a while, the next fill-up added on the same phone offers "Same split as last time". Tolls, parking and ferries can be split evenly on their own lines, and the balances add everything up. At the end, the settle-up lists the fewest payments that make everyone even.
Keep the receipts honest without a spreadsheet
The usual failure is not the arithmetic but the record: three fill-ups paid by three people, one forgotten. With one shared link, the person who paid adds it from the forecourt, and everyone can see it. Every line shows who entered it, a mistake can be edited, and a deleted line can be brought back from the history.
Frequently asked questions
Should the driver pay for gas?
There is no single rule. Many groups split fuel evenly including the driver; some let the driver off because they did the driving or wear on their car. Decide before you set off, then record it the same way every time.
How do you split gas money with friends on a road trip?
If everyone did the whole trip, split each fill-up evenly. If people joined for different legs, split by the distance each person was in the car. Either way, add every fill-up to one shared list as it happens and settle once at the end.
Can I split by kilometres in one line and evenly in another?
Yes. Each line in a sheet has its own split, so the fuel can go by distance and the cabin or the food can go evenly. The balances combine them.
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