To split expenses in different currencies, pick one group currency, convert each cost into it once at the rate for the day it was paid, and then work out who owes whom in that single currency. The common mistake is to keep every currency separate and settle each one on its own.
The mistake: settling each currency separately
It sounds fair. Francs for the Swiss bits, pounds for London, euros for Lisbon, and everyone pays everyone in the right money.
In practice nobody carries the right cash, you end up with four tiny debts instead of one, and the same people owe each other in opposite directions across currencies. It is also hard to tell whether the final numbers add up.
Converting everything into one currency first fixes all of that. After that it is the same maths as any other shared trip.
Step 1: choose a group currency
Pick the money most people in the group think in, usually the one most of you earn or bank in. It does not have to be the currency of the country you visit.
Decide this before the first purchase and write it down. Changing it halfway means redoing every conversion.
Step 2: convert each cost on the day it was paid
Use the rate for the day of the purchase, not the rate on the day you get home. Rates drift, and a single end-of-trip rate quietly favours whoever paid early or late.
Record two things for each cost: what the receipt said, and what it came to in the group currency. If someone asks later, both numbers are there.
Any sensible, public daily rate is fine. What matters is that the group agrees on the source and uses it every time.
A worked example: three countries, four friends
Priya, Tomas, Hana and Jonas travel through Portugal, Switzerland and the UK. They agree to keep the books in euros (EUR) and to split everything equally.
The rates below are made up for this example. They are not real or current rates.
| Cost | Paid by | Receipt | Rate | Booked in EUR |
|---|---|---|---|---|
| Lisbon dinner | Priya | 120.00 EUR | 1 | 120.00 |
| Zurich train tickets | Tomas | 84.00 CHF | 1.05 | 88.20 |
| London taxi | Hana | 48.00 GBP | 1.15 | 55.20 |
| Zurich lunch | Jonas | 100.00 CHF | 1.06 | 106.00 |
The total is 369.40 EUR. Split four ways, each person's share is 92.35 EUR.
| Person | Paid | Share | Balance |
|---|---|---|---|
| Priya | 120.00 | 92.35 | +27.65 |
| Tomas | 88.20 | 92.35 | -4.15 |
| Hana | 55.20 | 92.35 | -37.15 |
| Jonas | 106.00 | 92.35 | +13.65 |
The balances add up to zero, which is your check. To settle: Hana sends Priya 27.65 and Jonas 9.50, and Tomas sends Jonas 4.15. Three payments cover everything, even though three currencies were involved. Here is how combining debts keeps the payment count low.
What about card fees and bad exchange rates?
Here is the awkward bit. When you pay by card abroad, your bank may add a foreign transaction fee on top of the conversion. In the US, sources commonly put this at around 1 to 3 percent, and some travel cards charge none. Check your own card's fee table before you go.
That fee is charged to whoever held the card, so it lands on one person. Groups usually pick one of two simple rules.
Rule A: fees stay with the card holder
Everyone uses the agreed daily rate for the split. Whoever paid by a costly card absorbs the difference. It is simple, nobody needs a statement, and it nudges people to bring a fee-free card.
Rule B: the group shares the real cost
If one person pays for the group a lot, sharing the fee is kinder. Add it as its own cost, for example "card fee on Zurich tickets", split equally. Do this only if the person paying for everyone would otherwise be out of pocket every day.
In our example, a 3 percent fee on Tomas's 84.00 CHF tickets is about 2.65 EUR. Under Rule A he absorbs it. Under Rule B it becomes a small 2.65 EUR cost, and each person's share rises by about 0.66 EUR.
Whichever rule you choose, say so on day one. The arguments are about surprises, not about cents.
A message to agree it with the group
Let's keep the trip books in euros. We'll convert each cost at that day's rate, keep the original amount next to it, and settle once at the end. Card fees stay with whoever's card it is, unless someone is covering most of the trip, then we'll share them. Okay?
Common currency mistakes to avoid
- Converting everything at the end with one rate. It is easy but it shifts money between people.
- Rounding every line up. Keep two decimals and round only the final payments.
- Mixing group currencies halfway through the trip.
- Forgetting to record the original amount, so nobody can check a number later.
For the wider picture on trips, including who pays for what and when to settle, see our guide to splitting trip costs with friends.
If you would rather not do the conversions by hand, Evens lets you pick the currency a cost was paid in, fills in the daily rate (which you can edit), and books it in the group currency.
Try the currency split calculator
Frequently asked questions
How do you split expenses in different currencies?
Choose one group currency, convert each cost at the rate for the day it was paid, and calculate balances in that currency. Settle once at the end.
Which exchange rate should we use?
Use the rate for the day of each purchase from one source the group agrees on. The exact source matters less than using it consistently.
Who pays the foreign transaction fee?
By default, whoever's card was charged. If one person covers most of the trip, many groups add the fee as a shared cost instead.
Should we convert at the end of the trip instead?
It is simpler, but it is less fair, because a single rate ignores how rates moved while you travelled. Per-day rates cost little extra effort.
Do I need to keep the original receipt amount?
Yes. Keep the local amount next to the converted one so anyone can check the maths.