Currency Exchange Guide — How Exchange Rates Work

Whether you’re travelling abroad, sending money to family overseas, or investing in foreign markets, understanding how currency exchange rates work can save you real money. The difference between a good and bad exchange can easily amount to hundreds of dollars on a single transaction.

How Exchange Rates Are Determined

At its core, an exchange rate is the price of one currency expressed in terms of another. Like any price, it’s driven by supply and demand. When more people want to buy Canadian dollars, the CAD strengthens. When demand falls, it weakens.

Key factors that influence exchange rates include:

• Interest rates — higher rates attract foreign investment, increasing demand for the currency
• Inflation — lower inflation generally strengthens a currency over time
• Trade balances — countries that export more than they import tend to have stronger currencies
• Political stability — uncertainty drives investors toward “safe haven” currencies like the USD or CHF

Fixed vs Floating Exchange Rates

Floating rates are determined by the open market. Most major currencies — the US dollar, euro, Canadian dollar, and Japanese yen — use floating rates. Their values change constantly throughout the trading day.

Fixed (pegged) rates are set by a country’s central bank, usually tied to a major currency like the USD. For example, the Hong Kong dollar has been pegged to the US dollar since 1983. Fixed rates provide stability but require the central bank to maintain large foreign currency reserves.

The Spread: Where You Lose Money

The “mid-market rate” you see on Google is the midpoint between the buy and sell price on global markets. No one actually gets this rate. Banks, exchange bureaus, and payment services add a spread — the difference between what they buy currency for and what they sell it for. This spread is their profit.

Typical spreads vary widely:

• Airport kiosks: 5–10% markup (the worst option)
• Banks: 2–3% markup
• Online services (Wise, OFX): 0.3–1% markup
• Credit cards with no foreign transaction fee: near mid-market rate

When to Exchange Currency

Timing the market perfectly is impossible, but a few principles help:

1. Avoid last-minute exchanges — airport and hotel exchanges offer the worst rates
2. Watch the trend — if your home currency has been strengthening, exchange sooner rather than later
3. Use rate alerts — many apps let you set a target rate and notify you when it’s reached
4. Dollar-cost average — if you need a large amount, convert in several smaller batches to smooth out volatility

Travel Money Tips

For international travellers, here are practical ways to minimize exchange costs:

• Use a no-foreign-transaction-fee credit card for most purchases
• When a terminal asks “pay in your home currency?” always say no — this is Dynamic Currency Conversion, and it costs 3–5% extra
• Withdraw cash from bank ATMs rather than independent ones to get better rates
• Carry a small amount of local currency for tips and small vendors who don’t accept cards

Understanding how exchange rates work puts you in control. Even small improvements in the rate you get can add up significantly, especially for frequent travellers or anyone sending money internationally on a regular basis.

Related Tools

• Currency Converter — convert between currencies with live exchange rates
• Unit Converter — convert between units of length, weight, temperature, and more