Airport Currency Exchange Guide · Last checked 18 October 2026

Mid-Market Rate Explained: How to Find It and Use It Abroad

If you only prepare one thing before changing money, make it this: find out the mid-market rate for your currency pair. It is the yardstick every counter, bank and app is measured against, and you can look it up in seconds on the phone you are already carrying.

The short version

• The mid-market rate is the midpoint between the buy and sell prices for a currency pair at a given moment. It is a benchmark, not a rate a customer can normally get.
• Google Finance, XE and similar tools show it. The European Central Bank publishes a daily euro reference rate, but says it is not meant for transactions.
• Before you compare, make sure you are looking at the same direction (baht per dollar or dollars per baht) and the same unit (per 1 or per 100).
• The foreign exchange market is closed at weekends, so a rate you check on a Saturday is the last one traded.
• Our guide on airport markups covers how big the gap usually is. This guide covers how to measure it.

What the mid-market rate is

Every currency pair has two prices at any moment: one at which dealers will buy and one at which they will sell. The mid-market rate sits halfway between them. Wise, Winvesta, XE and a Gulf News personal finance article all describe it this way. Most of them are commercial, but they agree with each other.

Two points follow. First, because it is a midpoint, no one trades at exactly that rate. Winvesta says plainly that it is a wholesale benchmark and not a retail price, and XE says the mid-market rate is not available to customers and that the rate you receive when you send money is a different one. Second, every counter adds a margin to the midpoint. The useful question is how much, and the way to find out is to compare.

Where to look it up

Three kinds of source are worth knowing, and they are not interchangeable.

• Google Finance. Google's own disclaimer says its currency prices come from Morningstar, that they are delayed by three minutes, that they are provided for information only, and that Google cannot guarantee their accuracy. It advises you to confirm rates before any transaction. This is the page on Google's finance service, so we cannot say that the converter box on a normal Google search uses exactly the same feed. We could not confirm that.
• XE. XE's help page says it uses the mid-market rate on its free information screens, such as the Currency Converter, and that this is the midpoint between buy and sell rates and not a transactional rate. The page is from August 2023, and XE is a commercial money transfer company.
• The European Central Bank. The ECB publishes euro reference rates, usually around 16:00 central European time on each working day, for 29 currencies. They are set through a daily procedure among central banks, normally around 14:10, and aim to reflect the market at 14:15. The ECB says they are published for information only, and that using them for transactions is strongly discouraged. They are a once-a-day snapshot against the euro, not a live rate.

For comparing a counter, a live tool such as Google Finance or XE is the practical choice. The ECB figure is useful for background, and a good reminder that even an official rate is a reference, not a price.

Why two tools may show slightly different numbers

If you check two sources and the numbers differ in the third or fourth decimal place, that is normal. Our reading, which the sources support only in part, is that three things can cause it: the data provider, the exact moment of the snapshot, and the delay. Google, for example, states a three-minute delay. The ECB figure is fixed at a particular time of day. Neither difference matters for a traveller. A difference of a few hundredths of a per cent is far smaller than the margin at any counter. If two tools disagree by more than that, check that you are looking at the same pair in the same direction.

Reading a quote correctly

The most common mistake is not about the number, it is about its direction. A rate can be written two ways, and a counter's board and your phone may use different ones.

Say the board shows 35.00 for the US dollar. That means 35 baht per dollar. Your phone might show the other direction: 1 baht equals 0.0286 dollars. To compare them, divide 1 by 0.0286, which gives about 34.97 baht per dollar. The two figures describe almost the same rate. The numbers are made up.

Units can differ as well. THAIest, a travel site, noted that at one Changi counter the Swiss franc was quoted per 100 units, while another quoted it per 1 unit. If one board says 3,450 per 100 units, the per-unit rate is 34.50. Check the unit on the board before you compare.

The three-step check

1. Look up the mid-market rate for your pair, in the direction the counter uses.
2. Read the counter's rate for your transaction. If the board shows a buy and a sell figure, use the one that applies to what you are doing.
3. Subtract the counter's rate from the mid-market rate, divide by the mid-market rate, and multiply by 100.

Here is a made-up example. The mid-market rate is 1.00 and the counter offers 0.97. The gap is 0.03, divided by 1.00, which is 3 per cent. On an exchange of 1,000 units, you would receive 970 and the difference is 30.

A sourced example from Gulf News (March 2023) uses a mid-market rate of 0.68 for dollars to pounds against an offer of 0.65. The gap is 0.03 divided by 0.68, or about 4.4 per cent, which the article calls a hefty fee.

Checking on a weekend or holiday

According to Nordea bank's help page, foreign exchange trading runs 24 hours a day on weekdays, opens on Sunday at midnight central European time, and closes on Friday at 5 pm New York time. It is also closed on 25 December and 1 January. Between those times, nothing trades.

What that means for your phone is our own reading, not something the page states: the rate you see on a Saturday is the last one traded on Friday, so it does not move until trading reopens. A counter in an airport still needs to quote you something over the weekend, and we found no source that explains how counters set weekend rates. So the sensible habit is to check the rate on the day you land and, if you can, take a screenshot so that you can show what you compared against.

What the mid-market rate cannot tell you

It tells you where the market is. It does not tell you whether a counter's offer is fair for the service it provides, which includes staffing the counter, holding cash, and being open at 3 am. A margin is not automatically a rip-off. It is a price, and your job is to know it. The page on airport markups explains what the sources we found say about how large that price tends to be.

The mid-market rate also says nothing about fees charged separately, or about what a machine does when it offers to convert in your home currency. For that, see our guide to Dynamic Currency Conversion.

How much cash to bring

This depends on the trip, and no source can tell you the right amount. A reasonable approach, which is our advice and not a sourced fact, is to change a small amount for the first day, such as a ride and a meal, then use a card or a travel card for most spending, and compare rates before changing anything larger. Our guide on ATMs versus forex cards covers the trade-offs.

A full worked comparison

Here is how the check looks with three offers side by side. The numbers are made up. You are changing 1,000 units of your home currency, and the mid-market rate on your phone is 1.00.

• Counter A offers 0.98. The gap is 2 per cent, and you receive 980 units.
• Counter B offers 0.96. The gap is 4 per cent, and you receive 960 units.
• Counter C offers 0.94 and advertises no commission. The gap is 6 per cent, and you receive 940 units.

The gap between the best and worst offer is 40 units, which is 4 per cent of what you are changing. None of the three is shown as "a fee", yet every one of them has a cost. The only way to see it is to put each offer next to the same benchmark, taken at the same time. Without the mid-market rate, Counter C's "no commission" sign looks reassuring. With it, you can see it is the most expensive of the three.

Turning your budget into a figure you can check

It helps to know roughly what you expect to spend before you stand at a counter, because a percentage on its own can feel abstract. A simple way is to estimate your first-day cash needs in your home currency, then convert that figure at the mid-market rate on your phone. That tells you the amount the counter should hand you if it charged nothing. Whatever the counter actually gives you is that amount minus its margin, so the shortfall is the cost, in the local currency, of the exchange.

For example, suppose you expect to need the equivalent of 100 units of your currency on the first day, and the mid-market rate is 35.00 local units per unit of your currency. At the benchmark, you would receive 3,500 local units. If the counter offers 34.00, you would receive 3,400, which is 100 local units less, or about 2.9 per cent. Seeing the shortfall in the currency you are about to spend can make the decision easier than a percentage does.

Watching the rate before you travel

Gulf News mentions that free rate trackers from remittance providers can show a 30-day history and send alerts when a rate moves. Those tools exist, and they are useful for seeing what has happened. They cannot tell you what will happen next. Exchange rates move for many reasons, and none of the sources we found claims that a traveller can reliably pick the best day to exchange.

Our advice, which is not a sourced fact, is to treat a rate tracker as a way of knowing what normal looks like, not as a way of timing the market. For a holiday-sized amount, the margin a counter adds is usually a bigger and more certain cost than the day-to-day movement of the rate. Spending your time on the margin is a better use of an evening than spending it on timing.

How many decimal places matter

Rates are quoted with several decimal places, and it is easy to think the last digits matter. For the kind of comparison in this guide, they do not. Two sources that differ in the fourth decimal place are telling you the same thing. What matters is whether the counter's rate is a few hundredths of a unit away from the benchmark or several tenths. If you are comparing two counters whose rates differ only in the third or fourth decimal place, pick the more convenient one.

Common mistakes

• Comparing a rate in one direction with a rate in the other.
• Missing the unit on the board, such as per 100 units.
• Checking the rate days before and assuming it has not moved.
• Treating the mid-market rate as something you can get, instead of a yardstick.
• Using a headline threshold, such as "anything under 3 per cent is fine", from a website that does not show its evidence.

What we could not confirm

• That 1 to 3 per cent from mid-market is a "reasonable" gap and 8 per cent or more is worth walking away from.
• That the converter box on a normal Google search uses the same Morningstar feed as Google Finance.
• How counters set their rates over the weekend, when the market is closed.
• How often individual counters update their boards.
• Any independent check of how closely the free tools track the true market. The tools are all commercial or carry disclaimers.

A simple plan

1. Before you travel, look up the mid-market rate for your pair and write it down.
2. At the counter, check the direction and the unit on the board.
3. Work out the gap with the three-step check.
4. If the gap seems large, change only what you need and compare other options.
5. Keep the screenshot or note, so you can compare next time.

FAQ

What is the mid-market rate?
It is the midpoint between the buy and sell prices of a currency pair at a given moment. Several sources, including Wise, XE and Winvesta, describe it the same way.

Can I get the mid-market rate at a counter?
Normally not. XE and Winvesta both say it is a benchmark and not a rate customers receive.

Is the ECB rate the same as the mid-market rate?
No. The ECB publishes a daily euro reference rate and says it is for information only and strongly discourages using it for transactions.

Why does the rate on my phone change by the minute?
Because the market moves during the week. It stops moving at weekends, when the market is closed.

Sources and how we checked them

Checked on 18 October 2026. Where we call something confirmed, at least two of these sources agree. Several are commercial companies promoting their own services.

• Google Finance, Google's disclaimer page (currency data from Morningstar, three-minute delay).
• XE, commercial provider, help page on the currency converter, 21 August 2023.
• European Central Bank, official site, euro foreign exchange reference rates.
• Nordea, bank, help page on foreign exchange opening hours.
• Wise, commercial provider, mid-market rate explainer, updated 27 August 2026.
• Winvesta, commercial Indian provider, mid-market rate explainer, 20 May 2026.
• Gulf News, news outlet, how to judge whether a rate is fair, updated 20 March 2023.
• THAIest, travel site, Changi money changer page, updated 25 November 2025.

Editorial note: The counter, rate and airport information in this guide is editorial and is not paid for. Rates and fees change, so confirm the final rate at the counter before exchanging.