Skip to main content

How Exchange Rates Work: A Beginners Guide

July 6, 2025 โ€ข 4 min read

When you exchange money for a holiday or see news about a currency "weakening," what is actually happening? Exchange rates determine how much of one currency you get for another โ€” and they change constantly. Here is a plain-language explanation.

What is an Exchange Rate?

Exchange rate = Price of one currency in terms of another

Example: EUR/USD = 1.08 means 1 euro costs 1.08 US dollars

What Determines Exchange Rates?

Most currencies are "floating" โ€” their value is determined by supply and demand in foreign exchange markets. Key factors include:

  • โ–ถ Interest rates: Higher rates attract foreign investment, increasing demand for that currency
  • โ–ถ Inflation: Lower inflation relative to other countries makes a currency more attractive
  • โ–ถ Trade balance: Countries that export more than they import create demand for their currency
  • โ–ถ Political stability: Investors prefer stable, predictable governments
  • โ–ถ Economic growth: Stronger GDP growth attracts investment capital
  • โ–ถ Central bank policy: Actions by the Fed, ECB, or Bank of England directly affect rates

The Spread: Buy vs Sell Rate

When you exchange money, you will notice two rates:

  • โ–ถ Buy rate: What the exchange service pays YOU (lower)
  • โ–ถ Sell rate: What they charge YOU to buy currency (higher)
  • โ–ถ Mid-market rate: The "real" rate between buy and sell (what you see on Google)

The gap between buy and sell is the "spread" โ€” this is how exchange services make their profit. Airport exchanges typically have the worst spreads (5-10%), while online services offer 0.5-2%.

Common Misconceptions

  • โ–ถ "A strong currency is always good" โ€” Not necessarily. A strong currency makes exports expensive and imports cheap, which can hurt domestic manufacturers
  • โ–ถ "1 USD = 100 Japanese yen means USD is stronger" โ€” No, the numerical exchange rate does not indicate economic strength. Japan simply has a lower denomination structure
  • โ–ถ "Rates are fixed throughout the day" โ€” Rates change every second in forex markets, which trade 24 hours a day

Tips for Getting Better Rates

  • โ–ถ Compare rates online before going to a physical exchange
  • โ–ถ Avoid airport and hotel exchanges โ€” they have the worst margins
  • โ–ถ Use a travel-friendly bank card with no foreign transaction fees
  • โ–ถ When offered "pay in your home currency" abroad, always decline (this is Dynamic Currency Conversion with bad rates)
  • โ–ถ Exchange larger amounts at once rather than many small transactions

Try It Now

Open Currency Converter โ†’

๐Ÿ”— Try our converter: Open Converter โ†’