🎓 Prepared by students from Boğaziçi University

What is an Exchange Rate?

An exchange rate is the price at which one currency can be traded for another. It tells you how many units of one currency you need to buy a single unit of another. Exchange rates constantly fluctuate based on supply, demand, and economic factors like interest rates and inflation.

Short answer

An exchange rate is the price of one currency expressed in terms of another currency. For example, if USD/EUR = 0.92, then 1 USD equals 0.92 EUR.

USD/EUR Exchange Rate (6 months)

x: Month · y: EUR per USD

Try it: interactive calculator

Amount in foreign currency

92units

= 100 * 0.92

Amount in home currency100 unitsExchange rate (units of foreign per 1 home)0.92 ratio

Step-by-step worked examples

If USD/EUR = 0.92 and you have 100 USD, how many EUR do you receive?

EUR = Rate × Amount
EUR = 0.92 × 100
EUR = 92

GBP/USD = 1.27. Convert 50 GBP to USD.

USD = 1.27 × 50
USD = 63.50

JPY/USD = 0.0067. How many USD is 100,000 JPY?

USD = 0.0067 × 100,000
USD = 670

Flashcards

Quick quiz

Q1.EUR/USD = 1.09. How many dollars is 100 EUR?

Correct answer: B. 100 EUR × 1.09 USD/EUR = 109 USD.

Q2.Which event typically weakens a currency?

Correct answer: C. High inflation reduces purchasing power, weakening the currency internationally.

Q3.Currency appreciation means the exchange rate…

Correct answer: B. Appreciation means the currency is stronger, so you get more foreign currency.

Q4.Which is NOT a factor affecting forex rates?

Correct answer: C. Moon phases do not affect economic factors; inflation, policy and trade do.

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Common mistakes

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Exchange rates are always stable. — Correct: Rates change constantly throughout the day based on trading activity.

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Higher exchange rate always means the currency is stronger. — Correct: Context matters—a high JPY/USD rate actually shows a weak yen, not a strong one.

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Inflation has no effect on exchange rates. — Correct: Higher inflation weakens a currency's international value.

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Only central banks determine exchange rates. — Correct: Millions of traders and businesses set floating rates through daily transactions.

FAQ

What is an exchange rate?

The price of one currency in terms of another. USD/EUR = 0.92 means 1 USD costs 0.92 EUR.

Why do exchange rates change?

Supply and demand in forex markets, driven by interest rate differences, inflation, trade flows and geopolitical news.

What is currency appreciation?

A currency appreciates when it becomes stronger—it can purchase more foreign currency.

How do I calculate currency conversion?

Amount in foreign currency = Exchange rate × Amount in home currency.