What the Currency Exchange Fee Calculator does
This calculator shows what a currency exchange really costs you: it compares the rate you were offered with the mid-market rate you enter, adds any fixed and percentage fees, and reports the total cost in your own currency, the hidden markup in the rate and the effective rate you end up with. Add several providers to see which one leaves you with the most money.
There are no live exchange rates here. You type in the rate on the kiosk board, the app or the card statement, and the mid-market rate from a source you trust - so the result is exactly as current as your numbers.
How to use it
- Enter the currency you pay in, the currency you receive and the amount you are exchanging.
- Choose how the rates are quoted - for example euros per 1 pound, or pounds per 1 euro - and enter the rate you were offered and the mid-market rate at the same moment.
- Add any fixed fee and percentage fee, and say whether they are added on top or taken out of the amount. Card foreign-transaction fees are usually a percentage added on top.
- Read the total cost and where it comes from - the rate markup versus the explicit fees. Open the comparison to line up several providers with the same mid-market rate.
Reading the results
The mid-market rate is the midpoint between the prices at which banks buy and sell a currency on the wholesale market. Retail providers rarely give it to you; the gap between their rate and the mid rate is their margin, often advertised as "0% commission".
Rate markup is (mid - offered) / mid. It is the percentage of the value lost inside the rate alone, before any stated fee.
Total cost is what you paid minus what the currency you received is worth at the mid-market rate. It combines markup and fees into one honest number, in the currency you pay with.
Worked example: a card payment abroad with a foreign-transaction fee
An illustrative case: a card holder pays for a 144,800 yen hotel bill. The card network's rate works out at 144.80 yen per dollar, so the bill costs 1,000 dollars, and the bank adds a 3% foreign-transaction fee - 30 dollars - for 1,030 dollars in total. The mid-market rate at the time is 149.20 yen per dollar.
At the mid rate, 144,800 yen is worth 144,800 / 149.20 = 970.51 dollars. The total cost is 1,030 - 970.51 = 59.49 dollars, or 5.78% of what was paid.
Of that, the rate markup is (149.20 - 144.80) / 149.20 = 2.95%, about 29.49 dollars, and the stated fee is the other 30 dollars. The receipt shows only the 3% fee; the calculator shows both.
Formulas and scoring rules
- Rate markup
markup = (mid - offered) / midWith both rates quoted as units received per unit paid. Quotes the other way round are inverted first.- Amount received
received = (amount - fees if deducted, else amount) x offered- Total cost
cost = paid - received / midIn the currency you pay. As a percentage: cost / paid x 100.- Effective rate
effective = received / paidWhat you actually got per unit paid, all charges included.
Limitations: what the result does not prove
- No live rates: the result is only as good as the mid-market and offered rates you enter, and rates move by the second.
- The mid-market rate is a reference, not a price you can deal at. Even a good provider needs some margin; the question is how much.
- Some fees are charged separately and later (a monthly card fee, an ATM operator's charge on the screen). Add them to the fixed fee to include them.
- Card payments are converted at the rate on the day the transaction settles, which can differ from the day you paid.
Privacy: where your data goes
Everything you paste, type or drop is processed in this browser tab. It is not uploaded, logged, stored or sent to analytics. Session recording and tag-manager scripts are switched off on this page.
Standards and sources
- European Central Bank - Euro foreign exchange reference rates
- Regulation (EU) 2019/518 - currency conversion charges and transparency (dynamic currency conversion)
Frequently asked questions
What is the mid-market exchange rate?
It is the midpoint between the wholesale buy and sell prices for a currency pair at a moment in time - the rate you see on financial news sites and reference sources. It is the fairest yardstick for judging a retail rate, because it contains no provider margin.
What does zero commission mean at a currency exchange?
Usually that the provider takes its margin in the rate instead of as a visible fee. A board promising 0% commission with a rate 10% below the mid-market rate costs you about 10%. Enter the offered and mid rates here to see the real figure.
Should I pay in the local currency or my home currency abroad?
When a card terminal offers to charge you in your home currency, that is dynamic currency conversion, and the merchant's provider sets the rate - often several per cent worse. Paying in the local currency lets your card network convert. Compare both with this calculator if you can see the rates.
How do I compare two exchange offers with different fees?
Put them side by side in the provider comparison with the same amount and mid-market rate. The one that leaves you with the most of the currency you want is cheaper, however the costs are split between rate and fees.
Why is the effective rate different from the rate I was quoted?
Because fees reduce what you get for the money you hand over. The effective rate divides what you received by everything you paid, so a 1.18 rate with a 5 pound fee on 100 pounds is effectively about 1.12.
Last reviewed by the A2Z.Tools team against the sources listed above.
