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Trip Debt Settle-Up Calculator
Turn a messy pile of who-owes-whom into the shortest possible list of payments — enter net balances and get exact instructions.
Fewer payments, less friction
Once a trip's expenses are all tallied up, most groups are left with a tangle of small debts — everyone technically owes or is owed something from several different people. Instead of every pair settling separately, this calculator works out the smallest set of transfers that gets everyone to zero.
How the math works
Each round, the person owed the most money is paired with the person who owes the most, and they settle for whichever amount is smaller — fully closing out at least one person's balance every round. Repeating this until everyone hits zero reliably produces a short, practical payment list instead of a tangle of small transfers.
Frequently asked questions
Where do I get each person's net balance?
Use the Group Trip Cost Splitter to work out what everyone actually paid versus their fair share — the "net balance" column there is exactly what you enter here. You can also just estimate it directly if you already know roughly who's over and who's under.
Why does this need fewer payments than everyone paying everyone?
If four people all owe or are owed different amounts, settling every pair individually can take many more transactions than necessary. By always matching the biggest creditor with the biggest debtor first, this greedy method collapses the debts into the smallest number of payments that still balances everyone to zero.
What if the balances don't add up to zero?
In a correctly tracked group expense, every dollar someone is owed should be owed by someone else, so the balances should sum to zero. If they don't, the calculator flags the mismatch — double-check your entries, since a rounding error or a missed expense is the usual cause.
Is this the absolute mathematical minimum number of payments?
The greedy largest-owed-meets-largest-owes approach used here is the standard, widely used method for this problem and performs very well in practice; in some edge cases with specific number combinations, a more exhaustive search could theoretically shave off one more payment, but the difference is rarely worth the added complexity for a trip settle-up.