割 Warikan

How to split costs on a group trip (without it getting weird)

Money is the thing that ruins group holidays. Not the flights, not the weather — the quiet resentment of the person who fronted the hotel deposit and never quite got it back. Here's how to handle it.

Don't settle at the table

The instinct is to square up after every meal: four people, four cards, a waiter dividing a bill. It's slow, it annoys the restaurant, and it's where the arithmetic goes wrong.

The better system is the one accountants use: let debts accumulate, then net them off once at the end. One person pays for dinner. Someone else grabs the taxi. A third books the hotel. Nobody counts coins in the moment — you just record who paid what, and settle once.

Record four things, and only four

For every expense you need:

What it was — "dinner", "taxi to airport". You'll forget by day four.
How much, and in which currency.
Who actually paid. This is the one people get wrong: the payer is whoever's card was charged, not whoever booked it.
Who it was for. Usually everyone. Sometimes not — three of you took the taxi, one walked.

Anything more than this is bookkeeping, not travel.

Handle uneven splits honestly

Not every cost divides by four. Three broad cases:

Even. The default. Shared taxi, shared groceries.
By shares. Someone had two drinks and someone had none. Give one person a share of 2 and another a share of 0, rather than trying to itemise a bar tab.
Exact amounts. When the receipt genuinely is itemised — one person had the lobster.

A word of advice earned the hard way: don't be too precise. Groups that itemise every coffee tend to argue more, not less. The point of splitting is to stop thinking about money, not to start.

Multiple currencies

Pick one currency to settle in — usually everyone's home currency — and convert each expense into it as you record it, using roughly the rate you actually got.

Don't chase perfection here. If one person's card gave them 149 yen to the dollar and yours gave 151, the difference across a week is the price of a coffee. Agree one rate for the trip and move on. The alternative — reconciling everyone's individual card fees — is a genuinely miserable evening.

Settle up in the fewest payments

This is the part people do badly. Say four friends end a trip like this:

Person	Paid	Owed	Balance
Masa	36,000	18,000	+18,000
Yuki	6,000	18,000	−12,000
Ken	12,000	18,000	−6,000
Aya	18,000	18,000	0

The naive approach has everyone paying everyone — up to twelve transfers. But balances always sum to zero, which means you only ever need to move money from the people who are down to the people who are up. Here that's two payments: Yuki sends Masa 12,000, Ken sends Masa 6,000. Done.

The general rule: with n people you never need more than n − 1 transfers, and usually fewer. Match the biggest debtor to the biggest creditor, repeat.

Or let something else do the arithmetic

Warikan is a free bill splitter that does exactly this. Everyone on the trip adds their own expenses from their own phone, in any currency, and it tells you the fewest payments that clear the books. No app, no sign-up.

Start a trip — free

A few rules that prevent arguments

Agree the ground rules on day one, not day six. Are we splitting alcohol evenly? Is the person who doesn't drink paying for wine? Five minutes at the start saves a bad conversation at the end.
Log expenses the same day. Memory is not a ledger.
Everyone should be able to add expenses, not just the organiser. If one person is the bottleneck, things get missed — and they end up feeling like the group's accountant.
Settle within a week of getting home. Debts age badly.
Round in favour of generosity. If it's off by the price of a coffee, let it go.

What about people who don't pay up?

It happens, and it's rarely malice — it's friction. Make it as easy as possible: send the exact amount, in their currency, with a link they can tap. Most "they never paid me back" stories are really "I never actually asked, clearly, once."