How to Convert Currency: A Beginner's Guide to Exchange Rates
Learn how currency conversion works, what exchange rates mean, where to find the best rates, and how to avoid common mistakes when exchanging money.
What is a Currency Exchange Rate?
An exchange rate is the price of one currency expressed in terms of another. For example, if the USD/EUR exchange rate is 0.92, it means 1 US Dollar buys 0.92 Euros. Exchange rates change constantly — every second of every trading day — based on global supply and demand, economic data, political events, and market sentiment.
How Currency Conversion Works
The formula is straightforward:
Amount in Target Currency = Amount × Exchange Rate
Example: Convert $500 USD to EUR at a rate of 0.92:
500 × 0.92 = €460
Types of Exchange Rates
Interbank Rate (Mid-Market Rate)
This is the "real" exchange rate — the midpoint between buying and selling prices used by banks when trading with each other. When you look up an exchange rate on Google or a financial site, this is the rate you see. It's the benchmark everyone references.
Retail Rate
When you exchange money at a bank, airport kiosk, or bureau de change, you'll get a worse rate than the interbank rate. The difference is the provider's profit margin, called the spread.
Where to Get the Best Exchange Rates
- Use your debit card abroad: Many banks and cards (especially Wise, Revolut, and Charles Schwab in the US) offer rates very close to the interbank rate with low or no fees.
- Avoid airport currency exchange: Airport kiosks typically offer the worst rates — sometimes 10–15% worse than the mid-market rate.
- Use ATMs in the local currency: Withdraw cash from local ATMs in the country you're visiting, and always choose to be charged in the local currency (decline "dynamic currency conversion").
- Compare online transfer services: For sending money internationally, compare Wise, Remitly, and WorldRemit against your bank. The savings can be significant.
Common Currency Pairs
| Currency Pair | What It Means |
|---|---|
| USD/EUR | US Dollar to Euro |
| GBP/USD | British Pound to US Dollar |
| USD/JPY | US Dollar to Japanese Yen |
| USD/NGN | US Dollar to Nigerian Naira |
| EUR/GBP | Euro to British Pound |
| USD/CAD | US Dollar to Canadian Dollar |
What Makes Exchange Rates Move?
- Interest rates: Countries with higher interest rates tend to have stronger currencies as investors seek better returns.
- Inflation: High inflation erodes a currency's purchasing power and usually weakens it.
- Economic performance: Strong GDP growth, low unemployment, and trade surpluses tend to strengthen a currency.
- Political stability: Uncertainty and political turmoil weaken currencies as investors move to safer assets.
Convert Any Currency Instantly
Use our free currency converter to get live exchange rates for over 100 currencies. Updated daily so you always have current rates.