Last reviewed on May 1, 2026.
Anyone who has changed money at an airport, paid in a foreign currency on a card, or sent a transfer abroad has noticed the same thing: the rate the provider offers is never quite the rate that appears on a reference site. The gap is not a bug, an error, or — usually — a scam. It is the way the foreign-exchange market funds the cost of moving money for consumers. This guide walks through where the gap comes from, how to estimate it, and what to actually compare when you shop around.
What "mid-market" means
The mid-market rate is the midpoint between the best price at which somebody is willing to buy a currency in the wholesale market (the bid) and the best price at which somebody is willing to sell it (the ask). It is a reference price. Nobody actually transacts at the mid in size — it is a calculation that exists to summarise where the market is, the same way the "price" of a house describes the gap between what buyers will offer and what sellers will accept.
Reference services that publish daily rates — including the rate feed behind currencyconversion.org — generally publish a snapshot of the mid taken at a particular cut-off, or an average of mids over a window. That figure is what shows in every rate box on this site.
What "the bank rate" means
The bank rate, sometimes labelled the "tourist rate" or "retail rate", is the rate at which a specific provider — a bank, card network, ATM operator, money-transfer service, or currency exchange counter — will actually transact with you. There is no single bank rate; every provider sets its own. Each one is built by taking a reference (typically a wholesale mid) and adding a margin on top.
That margin pays for: the provider's own access to wholesale liquidity, hedging the residual position, regulatory and compliance overhead, branch or app infrastructure, anti-fraud checks, customer-support staff, settlement costs, and a profit. None of those exist for free, so a margin always exists. The questions worth asking are how big it is and whether the provider tells you about it clearly.
Where the gap shows up
1. Spread on the rate
The most common way the margin is taken is by quoting a worse rate than mid. A bank might use a rate that is 2% worse than mid for retail card transactions in a foreign currency, while a specialist online transfer service might use a rate that is 0.5% worse than mid. That single number — the percentage gap from mid — is the headline cost of the conversion. It scales with the amount you transfer, so on a large transaction the spread dwarfs any flat fee.
2. Flat or percentage fees
On top of the spread, providers often charge an explicit fee. Wire transfers commonly carry a flat fee. Some money-transfer apps charge a small percentage. Card payments sometimes include a "non-sterling transaction fee" or equivalent. A flat fee that is small relative to the amount being moved barely matters; on a small transfer it can dominate.
3. Dynamic currency conversion (DCC)
When you pay by card abroad or use a foreign ATM, you are sometimes offered the choice to be billed "in your home currency" rather than the local currency. That option, branded as Dynamic Currency Conversion, lets the merchant or ATM operator do the conversion themselves at a rate they choose — almost always at a rate worse than the one your card network would have applied. Always picking local currency at the terminal hands the conversion back to your card network and is normally the cheaper option.
4. ATM operator surcharges
Foreign ATMs may add their own withdrawal fee on top of anything your home bank charges. Sometimes that surcharge is disclosed before you confirm; sometimes it is buried in a final receipt. It is an additional cost to factor in alongside the FX margin.
5. Weekend and bank-holiday adjustments
Wholesale FX markets are largely closed at weekends. Card networks and consumer providers continue to authorise transactions, but they cover the risk of weekend gaps by widening the spread or by holding rates at a stale Friday level. A purchase made late Saturday may book against a Monday-morning rate plus a weekend cushion.
A worked example
Imagine you want to send 1,000 EUR to a recipient in the United States, and the mid-market EUR/USD rate is exactly 1.0800. Three possible providers:
| Provider | Rate offered | Spread vs mid | Fee | USD delivered |
|---|---|---|---|---|
| Provider A — high-street bank | 1.0584 | 2.0% | 20 EUR | 1,037.04 |
| Provider B — online transfer service | 1.0746 | 0.5% | 3 EUR | 1,071.38 |
| Provider C — broker with FX account | 1.0789 | 0.1% | 5 EUR | 1,074.51 |
The numbers above are illustrative, not pulled from any specific provider's live pricing. The point is the structure: the rate gap is doing most of the work. A 2% spread on 1,000 EUR is 20 EUR before any flat fee even appears. A 0.5% spread is 5 EUR. The flat fee matters at small amounts; the spread matters at every amount.
(reference − provider) ÷ reference × 100. The result is the spread in percentage terms.
What to compare when you shop around
- Rate spread vs mid-market, expressed as a percentage. The lower the better. Anything under about 0.5% on a major pair is good for a retail provider; anything above 2% is expensive.
- All fees combined — flat fees, percentage fees, ATM surcharges, recipient-side fees if the receiving bank charges to receive.
- The "amount delivered" figure if the provider quotes one. That single number captures spread plus fees and is the cleanest way to compare.
- Speed of delivery — same-day vs next-business-day vs several business days. Sometimes a slightly worse rate is worth it if the money has to be there immediately.
- Limits and verification requirements — particularly for large transfers, where a cheaper provider may insist on documentation that takes time to gather.
What is not a fair comparison
- Comparing the rate from a reference site (mid-market) directly with the rate from a retail provider, and concluding the retail provider is overcharging by the full gap. Some gap is unavoidable; the right question is whether it is large or small.
- Comparing two providers' rates captured five minutes apart on a fast-moving day. Both could be normal at their respective timestamps.
- Comparing a "no-fee" provider that quotes a wide rate spread against a "with-fee" provider that quotes a tight spread, by looking only at the fee. The spread does most of the work.
Common mistakes
- Choosing "home currency" at a foreign ATM or card terminal — almost always the more expensive option.
- Using a debit card abroad without checking whether the issuer applies a foreign-transaction fee.
- Doing one large conversion at a moment that happens to be a weekend low point, when reference rates may be carried over from the previous business day.
- Ignoring receiving-bank fees on international wires, which are charged on the destination side and are not visible on the sending platform.
How this site fits in
currencyconversion.org publishes the mid-market reference rate, not a quote you can transact at. That is intentional. Showing one provider's retail rate would imply an endorsement; showing a mid-market reference lets you compare any provider against a neutral benchmark. To use this site for shopping around, open the relevant pair page (for instance USD to EUR or GBP to USD), note the reference rate, then compare it to the rate any specific provider is quoting you.
Where to go next
If you are not yet sure how to read the rate itself — what is the base, what is the quote, why the inverse rate is just 1 ÷ R — start with the how exchange rates are quoted guide. To know whether the pair you are dealing with is a major, minor, or exotic — which usually predicts how wide the spread will be — see the major, minor, and exotic pairs guide. The ISO 4217 codes guide explains the three-letter codes that turn up everywhere.