When half the trip is in dollars and the other half in euros
Three friends, two weeks, two continents. A week in New York where everything is in dollars, then a flight to Lisbon where everything is in euros. Somebody paid for the apartment in each city, somebody else covered most of the food, and by the time you land home nobody can say who is up and who is down.
You cannot add dollars to euros
This is the whole problem, and it sounds too obvious to be worth stating until you are the one holding the receipts. Ana paid $1,240 for the Brooklyn apartment. Ben paid €700 for the one in Lisbon. Those are not comparable numbers, and no amount of splitting them three ways makes them comparable.
So the group does one of three things, and all three are bad. Somebody converts in their head at the table and writes down a rounded guess. Somebody looks up a rate on their phone once, on one day, and applies it to a fortnight of spending. Or everyone gives up and calls it even, which always means one person quietly paid more.
What the trip actually looked like
| What | Who paid | Amount |
|---|---|---|
| Brooklyn apartment, 6 nights | Ana | $1,240 |
| Airport transfer and subway cards | Ben | $86 |
| Dinner in Williamsburg | Cara | $154 |
| Lisbon apartment, 7 nights | Ben | €700 |
| Groceries and coffee, Alfama | Cara | €128 |
| Tram tickets and a day trip to Sintra | Ana | €96 |
Six expenses. Two currencies. Three people. There is a correct answer to who owes whom, and no group has ever found it standing in an airport queue.
How OweNo handles it
Every expense keeps the currency you actually paid in. You do not convert anything, you do not round anything, you just type $1,240 for the New York apartment and €700 for the Lisbon one, and the app remembers which is which.
Balances are then worked out per currency, so you can see plainly that Ben owes Ana in dollars while Ana owes Ben in euros — rather than a single blended number that hides what actually happened. When you want the trip as one figure, the group’s currency takes over: set it to euros and the totals and the spending charts are all shown in euros, converted with live exchange rates.
Three things worth doing anyway
- Pay in the local currency.When a card machine asks whether you want to be charged in dollars instead of euros, say no. Accepting it hands the exchange rate to the shop’s payment processor, and it is never a better rate than your bank’s. Hotel desks and car hire counters ask this the most.
- Log it in the currency on the receipt. Not what you think it is worth at home. The number on the paper is the one everybody at the table agrees on.
- Settle when you get back, not months later. Rates move. The longer a cross-currency debt sits, the further it drifts from what it was when you agreed it.
None of this is complicated once the app is keeping both currencies straight. The reason it feels complicated is that people try to do the conversion themselves, in their heads, while tired, in an airport — which is the one moment nobody should be doing arithmetic.
