An exchange-rate display can look like a single number, but a tradable currency quote normally has two: a bid and an ask. The difference between them is the spread, and it is one of the costs of changing money.
Once you know which currency is the base, which side of the quote applies to your transaction, and whether the rate is actually executable, most exchange-rate displays become straightforward.
A currency pair is a price
In a quote such as EUR/USD = 1.0842:
- EUR is the base currency—the currency on the left.
- USD is the quote, or counter, currency—the currency on the right.
- The quote means €1 costs $1.0842.
For any pair written as A/B:
1 unit of A = B units
So, if EUR/USD rises from 1.0842 to 1.1000, one euro buys more dollars than before. The euro has strengthened against the dollar, or the dollar has weakened against the euro. If you hold dollars and need to buy euros, however, a higher EUR/USD rate is less favorable to you.
Bid and ask: the two prices in a quote
A dealer may display EUR/USD like this:
EUR/USD 1.0840 / 1.0842
| Price | What it means | What you do as the customer |
|---|---|---|
| Bid: 1.0840 | The dealer buys euros for $1.0840 each | You sell euros at this price |
| Ask: 1.0842 | The dealer sells euros for $1.0842 each | You buy euros at this price |
The first price is normally the bid and the second is the ask. But always check the platform or provider’s labels. Consumer currency websites sometimes use “buy rate” and “sell rate” from the provider’s perspective, which can be the opposite of how a customer informally interprets those words.
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What does “buy EUR/USD” mean?
Buying the pair means buying the base currency and selling the quote currency:
- Buy EUR/USD: buy euros and sell dollars.
- Sell EUR/USD: sell euros and buy dollars.
The USD appearing in the pair does not mean that buying EUR/USD means buying dollars. The first currency determines the direction of the trade.
Which side of the quote should you use?
Use the ask when you buy the base currency. Use the bid when you sell the base currency.
| Your transaction | Price used |
|---|---|
| Buy euros with dollars | EUR/USD ask |
| Sell euros for dollars | EUR/USD bid |
| Buy the base currency | Ask |
| Sell the base currency | Bid |
Example: converting dollars into euros
Assume EUR/USD is quoted at 1.0840 bid / 1.0842 ask. You have $1,000 and want euros. You are buying the base currency, so use the ask:
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Before any fees, you receive approximately €922.34.
Example: converting euros into dollars
Now assume you have €1,000 and want dollars. You are selling euros, so use the bid:
€1,000 × 1.0840 = $1,084.00
What is the bid-ask spread?
The spread is the difference between the ask and the bid:
Spread = ask − bid
With a quote of 1.0840 / 1.0842:
1.0842 − 1.0840 = 0.0002
For a standard EUR/USD quote, that is 2 pips. The spread is an embedded cost. If you buy euros at the ask and immediately sell them at the bid, with no market movement, you lose the difference between the two prices.
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- $1,000 buys euros at the ask:
$1,000 ÷ 1.0842 = €922.3391 - You immediately sell those euros at the bid:
€922.3391 × 1.0840 = $999.8155 - Your immediate loss is:
$1,000 − $999.8155 = $0.1845
The approximately 18-cent loss comes from crossing the spread. It does not include commissions, financing charges, taxes, transfer fees, or any movement in the exchange rate.
Spreads in pips, percentages and basis points
Pips
A pip is a conventional unit for expressing a currency-price movement. The decimal position depends on the pair and the platform.
- For many non-JPY pairs, such as EUR/USD, a movement from 1.08400 to 1.08410 is 1 pip.
- For many JPY pairs, such as USD/JPY, a movement from 156.420 to 156.430 is 1 pip.
- A fifth decimal place, or third decimal place for many JPY pairs, may represent a fractional pip, often called a pipette.
Do not assume that every platform uses the same number of decimal places. Futures contracts can also use product-specific tick sizes that differ from over-the-counter spot-FX conventions.
Percentage spread
A pip count is useful when comparing similar currency pairs, but a percentage gives more context across different price levels. First calculate the midpoint:
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Midpoint = (bid + ask) ÷ 2
For 1.0840 / 1.0842, the midpoint is 1.0841. The relative spread is:
(0.0002 ÷ 1.0841) × 100 ≈ 0.01845%
That is approximately 1.845 basis points. The midpoint is a comparison reference, not usually a price at which you can transact.
Mid-market rates are not always available to customers
A search engine, app or financial website may show a “mid-market” rate. This is generally the midpoint between a bid and an ask, or a reference rate calculated from market data. It is useful for judging whether a provider’s offer is broadly competitive, but it is not normally the rate you can use to buy or sell immediately.
A bank, card network, ATM operator or money-transfer company may use a different customer rate. It may also add a margin to a reference rate or charge a separate fee. The European Central Bank, for example, describes its euro reference rates as informational and discourages using them as transaction rates.
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When comparing providers, focus on the final amount received rather than the headline rate:
Total cost = amount sent − value received after the provider’s rate and all fees
Spread, markup and commission are different costs
| Cost | How it works |
|---|---|
| Spread | The difference between the provider’s bid and ask. |
| Markup | A margin added to a reference or market rate, often embedded in the customer’s exchange rate. |
| Commission or service fee | A separate charge, stated as a currency amount or percentage. |
A transaction may contain more than one of these costs. “Zero commission” does not necessarily mean zero currency-conversion cost. A provider can avoid a separate fee while offering a less favorable exchange rate.
For a practical comparison, enter the same amount and destination currency into each provider’s calculator and record the final delivered amount. Include card fees, transfer fees, ATM fees, minimum charges and any fee paid by the recipient.
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Why the spread changes
The spread is not a permanent feature of a currency pair. It can widen or narrow because of:
- Market liquidity and available trading volume.
- Volatility and economic or political news.
- Trading hours, weekends and market closures.
- The size of your transaction.
- Available order-book depth.
- The provider’s pricing model.
- The type of product being quoted.
A displayed quote may apply only to a limited amount. A larger order can use several price levels and receive a worse average price. This is called slippage or market impact. A tight spread on a small displayed quantity does not guarantee the same cost for a large transfer or trade.
Inverting a currency quote
If EUR/USD is 1.0842, the approximate inverse is:
USD/EUR = 1 ÷ 1.0842 ≈ 0.9223
With a two-sided quote, you must invert the prices and switch their order. If:
A/B = bid 1.0840 / ask 1.0842
then:
B/A bid = 1 ÷ 1.0842 ≈ 0.92234
B/A ask = 1 ÷ 1.0840 ≈ 0.92251
The inverse bid uses the original ask, and the inverse ask uses the original bid. Simply taking the reciprocal of each number without switching the sides can produce an invalid quote in which the “bid” is higher than the “ask.”
Do not confuse spot, futures and retail conversion rates
The label EUR/USD can refer to different things:
- Over-the-counter spot foreign exchange.
- An exchange-traded currency futures contract.
- A bank’s retail conversion rate.
- A card-network rate.
- A money-transfer quote.
- A central-bank reference rate.
These prices are not automatically interchangeable. Futures prices can differ from spot prices because of interest-rate differences, the cost of carrying the currencies and the contract’s quotation convention. Some futures contracts also quote currencies in the reverse direction from the convention used in an OTC spot market.
Before comparing numbers, identify the product, timestamp, quote direction, contract size and whether the price is executable for your transaction.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A checklist for reading any exchange-rate display
- Identify the pair. Which currency is on the left, and which is on the right?
- Read the unit. How many units of the quote currency equal one unit of the base?
- Identify your transaction. Are you buying or selling the base currency?
- Choose the side. Use the ask to buy the base and the bid to sell it.
- Calculate the spread. Subtract the bid from the ask.
- Check the basis. Is the spread shown in pips, a percentage or a currency amount?
- Identify the quote type. Is it live, delayed, mid-market, a reference rate, a futures price or a retail rate?
- Check the quantity. Does the displayed price apply to the full amount you need?
- Find additional charges. Look for commissions, transfer fees, card fees, ATM fees and financing costs.
- Check validity. Is the quote live, historical, daily or subject to expiration?
FAQ
Is the bid the price I pay when exchanging currency?
Usually no. In a standard dealer quote, the bid is the price at which the dealer buys the base currency, so a customer selling the base receives the bid. A customer buying the base normally pays the ask. Provider labels should always be checked.
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Why did I receive less than the mid-market exchange rate?
The mid-market rate is generally a midpoint or reference rate, not an executable customer rate. The provider may apply a spread, markup or separate fee, and the final amount may also reflect card, transfer or ATM charges.
What is a good spread?
There is no universal threshold. It depends on the currency pair, market conditions, product, transaction size and other fees. Compare the complete amount received, not just the visible spread.
Does a higher EUR/USD rate mean I am better off?
Only if you own euros or are buying euros with dollars at that time. A higher EUR/USD means one euro costs more dollars. That benefits someone holding euros but makes euros more expensive for someone holding dollars.
Are pips always the fourth decimal place?
No. Many non-JPY pairs use the fourth decimal place for a pip, while many JPY pairs use the second decimal place. Platforms may also display fractional pips, and futures contracts can have separate tick-size conventions.
Can I calculate the exchange rate by dividing either way?
You can invert a quote by taking its reciprocal, but with a two-sided quote you must also switch the bid and ask. The inverse bid is 1 divided by the original ask, while the inverse ask is 1 divided by the original bid.
The Bottom Line
Read an exchange rate as a price: the first currency is the base, and the second is the currency used to express its value. Buy the base at the ask; sell it at the bid. The gap between those prices is the spread, an immediate cost that exists before commissions and other fees.
For personal-finance decisions, the most useful comparison is the final amount delivered for the same amount sent. A mid-market headline rate, narrow spread or “zero commission” claim does not by itself tell you what the conversion will cost.
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