How Currency Exchange Rates Are Determined

Every day, over $7.5 trillion worth of currencies are traded in the foreign exchange (forex) market. But what determines whether 1 USD equals 0.92 EUR or 0.85 EUR? Let's break it down.

The Basics: Supply and Demand

At its core, currency exchange rates work like any other market — they're driven by supply and demand. When more people want to buy a currency than sell it, its value goes up. When more people want to sell, its value drops.

For example, if American companies are buying lots of European goods, they need euros to pay for them. This increased demand for euros pushes the EUR/USD rate up.

Key Factors That Affect Exchange Rates

1. Interest Rates

This is the biggest factor. When a country's central bank raises interest rates, its currency typically strengthens because:

• Higher rates attract foreign investors seeking better returns
• More investment means more demand for that currency
• The US Federal Reserve, European Central Bank, and Bank of England decisions move markets instantly

2. Inflation

Countries with lower inflation tend to have stronger currencies. Why? Low inflation means your money maintains its purchasing power, making it more attractive to hold.

If inflation in Country A is 2% and Country B is 10%, Country A's currency will likely appreciate relative to B over time.

3. Economic Performance

Strong economic indicators boost currency values:

• GDP growth — Growing economies attract investment
• Employment data — Low unemployment signals economic health
• Trade balance — Countries that export more than they import see currency demand

4. Political Stability

Investors prefer stable countries. Political uncertainty, elections, or geopolitical tensions can cause currencies to drop as investors move money to "safe havens" like the US dollar, Swiss franc, or Japanese yen.

5. Speculation

About 90% of forex trading is speculative — traders betting on future movements rather than exchanging currency for goods. Large hedge funds and banks can move markets significantly.

Types of Exchange Rate Systems

Floating Rates

Most major currencies (USD, EUR, GBP, JPY) use floating exchange rates — their value is determined purely by market forces. Central banks may intervene occasionally but don't set fixed rates.

Fixed/Pegged Rates

Some currencies are pegged to another currency (usually USD). For example:

• Hong Kong Dollar (HKD) is pegged to USD at ~7.8
• UAE Dirham (AED) is pegged to USD at 3.67
• Saudi Riyal (SAR) is pegged to USD at 3.75

These countries' central banks actively buy/sell currencies to maintain the peg.

Why Rates Change Every Second

The forex market operates 24 hours a day, 5 days a week across global financial centers (London, New York, Tokyo, Sydney). As news breaks, economic data releases, or sentiment shifts, millions of trades adjust prices in real-time.

Major events that cause instant rate changes:

• Central bank interest rate decisions
• Employment/jobs reports
• Inflation data releases
• Political events (elections, policy changes)
• Unexpected global events

The "Mid-Market Rate" vs What You Get

The rate you see on Google or our converter is the mid-market rate — the midpoint between buy and sell prices in the forex market. This is the "real" rate.

When you actually exchange money, banks and services add a markup (their profit). This can range from:

• 0.3-1% — Services like Wise, Revolut
• 2-5% — Banks
• 8-15% — Airport exchanges

Key Takeaways

• Exchange rates are driven by supply and demand
• Interest rates are the biggest factor — higher rates = stronger currency
• Economic health, inflation, and stability all play major roles
• Most major currencies float freely; some are pegged to USD
• The mid-market rate is the "real" rate — always compare what you'll actually receive