The exchange rate a bank or currency counter actually offers is almost always a little worse than the real mid-market rate quoted between banks — and that gap is a cost, even when there’s no separate fee listed anywhere.
How it works
The amount converted at the mid-market rate is the ideal outcome. The amount actually received, at the offered rate minus any flat fee, is what’s really paid out. The difference between the two is the true cost of the exchange — often larger than any stated flat fee alone.
Why “no fee” doesn’t mean free
Many providers advertise no commission while building their margin entirely into a worse exchange rate — the spread between the mid-market and offered rates. A transaction with a $0 stated fee can still cost more overall than one with a small flat fee and a rate closer to the mid-market.
How to use this calculator
- Enter the amount being exchanged.
- Enter the mid-market rate and the rate actually being offered.
- Enter any additional flat fee.
Frequently asked questions
Where do I find the real mid-market rate?
Independent currency-data sites and most financial news sources publish it — it’s the same rate shown, for instance, in a basic web search for an exchange rate.
Is the spread the same everywhere?
No — it varies significantly by provider, and by transaction type (cash exchange counters are often the worst, specialized transfer services often among the best).
Does a credit card’s foreign transaction fee work the same way?
Similar idea — some cards charge an explicit percentage fee on top of a rate close to mid-market, while others build a wider spread into the rate with no separate fee listed, the same trade-off this calculator surfaces.
