Every guide on this site comes back to one number, so it is worth getting precise about what it is.
Currencies are traded between large financial institutions on a decentralised global market. At any moment, a bank willing to buy euros with dollars will name a price it will pay — the bid — and a bank willing to sell euros will name a price it wants — the ask. The ask is always slightly higher than the bid. That difference is the spread, and it is how market makers earn a living.
The mid-market rate — also called the interbank rate or, loosely, the "real" rate — is simply the midpoint between those two numbers:
mid = (bid + ask) ÷ 2
If banks are bidding 1.0840 and asking 1.0844 for EUR/USD, the mid-market rate is 1.0842.
That is the whole of it. There is no committee that sets it and no official body that publishes it. It is an average of what the market is doing right now, and because major currency pairs trade in enormous volume, the mid-market rate for something like EUR/USD is extremely consistent across every source that reports it.
Why you are never offered it
The mid-market rate is a wholesale price for institutions moving millions of units at a time. You are a retail customer moving a comparatively tiny amount, and the business handling your transaction has costs: liquidity, compliance, settlement, fraud risk, staff, and a profit target.
Those costs get recovered in one of two ways, and the distinction matters enormously:
- A stated fee. A flat charge or a percentage, shown to you as a line item before you commit.
- An exchange rate markup. The provider quotes you a rate that is deliberately worse than mid-market and keeps the difference. Nothing appears as a fee.
The second method is where most consumer money is lost, precisely because it does not look like a charge. A transfer advertised as "zero fees, no commission" can easily be more expensive than one charging a visible flat fee, because the rate itself has been marked up by several percent. Our guide to what banks and brokers really charge walks through how to measure that markup in about thirty seconds.
How to use the mid-market rate as a benchmark
Because the mid-market rate is public and consistent, it functions as a neutral yardstick. The method is simple:
- Look up the mid-market rate for your pair. (That is what the converter on our home page displays.)
- Ask your bank or transfer service for the exact amount the recipient will receive, not just the rate.
- Divide what they will receive by what the mid-market rate says they should receive.
The shortfall is your total cost, expressed as a percentage — and it captures both visible fees and hidden markup in a single figure. It is the only comparison that is genuinely apples-to-apples between providers.
| Provider quotes | Recipient gets | Mid-market says | Total cost |
|---|---|---|---|
| Rate 0.9200, fee 8.00 | 912.64 | 920.00 | 0.80% |
| Rate 0.8925, no fee | 892.50 | 920.00 | 2.99% |
| Rate 0.8740, no fee | 874.00 | 920.00 | 5.00% |
The middle and bottom rows both advertise "no fees." One of them costs nearly four times as much as the option with a visible charge.
Mid-market rates move, and quotes expire
Because the mid-market rate reflects a live market, it changes continuously during trading hours. Two practical consequences:
A quote is a snapshot. When a provider shows you a rate, they are typically holding it for a short window — often minutes. If you leave the page open and come back an hour later, the number you act on may not be the one you saw.
Markets close. The foreign exchange market runs roughly from Sunday evening to Friday evening in North American terms. Over the weekend there is no live trading in most pairs, so rates you see are carried over from Friday's close. Providers know this and often widen their spreads over weekends and holidays to protect against a gap when trading resumes. If your transfer is not urgent, weekday transfers are usually better priced.
CurrencyLook sources fiat rates from the free open.er-api.com feed, which publishes a daily update rather than a tick-by-tick stream. That is entirely adequate for benchmarking, budgeting, and comparing providers — a daily reference rate will not move enough to change which provider is cheapest. It is not adequate as the basis for a large or time-sensitive transaction. For those, confirm the live rate with your provider at the moment you transact.
Related terms you will run into
Spot rate
The rate for a transaction settling immediately (in practice, within two business days). For consumer purposes, "spot rate" and "mid-market rate" are used more or less interchangeably, though a spot quote you are given personally will usually include a markup.
Forward rate
A rate agreed today for an exchange happening on a set future date. Businesses use forwards to remove uncertainty from a payment they know is coming. The forward rate is not a prediction — it is derived mathematically from the spot rate and the interest rate difference between the two currencies.
Buy rate and sell rate
What a bureau or bank displays on a board. The buy rate is what they will pay you for a currency; the sell rate is what they will charge you for it. The mid-market rate sits between them, and the width of the gap tells you how expensive that counter is. At an airport that gap can be enormous — see our guide to airport exchange counters.
Cross rate
A rate between two currencies derived through a third, usually the US dollar. If you convert Thai baht to Norwegian krone, there is very little direct trading in that pair, so the rate is calculated via USD. Each leg can carry its own markup, which is why unusual pairs often cost more than they look like they should.
The short version
- The mid-market rate is the midpoint of what institutions are bidding and asking. It is a real market number, not a marketing one.
- Nobody sells currency to consumers at it. The question is never whether there is a margin, only how big it is and whether it is disclosed.
- "No fees" tells you nothing on its own. Compare the amount that lands, not the rate or the fee in isolation.
- Use the mid-market rate as a ruler. Any provider unwilling to show you the exact receiving amount is a provider worth skipping.
Check any rate against the benchmark Our converter shows the mid-market rate for 160+ currencies, so you can measure what you are actually being offered.
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