GLOSSARY
Exchange rate
The price of one currency measured in another — the number a currency pair is trading at.
Updated 2026-09-04 · Educational content · No broker owns this site
Quick answer. An exchange rate is the price of one currency expressed in terms of another. In a currency pair it states how many units of the quote currency are needed to buy one unit of the base currency.
An exchange rate is a price tag on money. EUR/USD at 1.0850 means one euro costs 1.0850 US dollars — the same grammar as "this coffee costs 3.20". The only unusual part is that the thing being priced is itself money.
How do you convert with an exchange rate?
Two directions, one rule each.
Base into quote — multiply. You hold €10,000 and want to know its dollar value at EUR/USD 1.0850:
- 10,000 × 1.0850 = $10,850.00
Quote into base — divide. You hold $10,000 and want to know how many euros it buys at the same rate:
- 10,000 ÷ 1.0850 = €9,216.59
Note that these are not the same number in reverse, and they are not supposed to be. €10,000 is worth more than $10,000 when a euro costs more than a dollar.
Why do exchange rates move at all?
Because they are set by supply and demand in a genuinely enormous market rather than fixed by anyone. The BIS Triennial Central Bank Survey recorded average daily turnover of $9.6 trillion in OTC foreign exchange in April 2025, up 28% from $7.5 trillion in 2022. Spot trading — the immediate exchange of one currency for another — was about $3 trillion per day, roughly 31% of the total.
Interest rate differences, growth, inflation, trade flows and central bank policy all feed into it. For a beginner the useful takeaway is narrower: no single participant sets the rate, and the rate you see already reflects what the market currently knows.
Is the rate you see the rate you get?
No — and this catches people out. A broker does not show one exchange rate; it shows two. You buy at the higher one and sell at the lower one. The "exchange rate" quoted on a news site or a search result is usually the midpoint between them, which is a number nobody actually trades at.
The mistake beginners make
Treating the mid-market rate seen on a search engine as the price available to trade. The tradeable prices sit either side of it: the ask above and the bid below. The gap is the spread, and it is a real cost deducted from every position the moment it opens.
Related terms
- Currency Pair — what the rate is quoting
- Base Currency — the one unit being priced
- Quote Currency — the currency doing the pricing
- Bid Price — the lower of the two real prices
- Ask Price — the higher of the two real prices
Every term above is part of the same idea: how a forex price is written down and what it costs you to trade on it. Start at currency pair if you are reading these for the first time, or browse the full glossary.