What Is an Exchange Rate?
An exchange rate is the price of one currency expressed in another. For example, EUR/USD = 1.08 means 1 euro buys 1.08 US dollars. Exchange rates fluctuate continuously based on interest rate differentials, inflation, trade balances, economic data, and market sentiment.
How to Convert Currencies Online
Use the tool.tl Exchange Rate Converter:
- Go to tool.tl/exchange-rate
- Select the source currency (e.g., USD) and target currency (e.g., EUR)
- Enter the amount
- See the converted amount instantly — rates update in near real time
Mid-Rate vs Bank Rate: Why Is There a Gap?
| Rate Type | What It Is | When You Encounter It |
|---|
| Mid-market rate (interbank) | Midpoint between buy and sell; the "true" rate | Online calculators, financial data |
| Bank buy rate | Bank pays you this when you sell foreign currency (lower than mid) | Converting foreign currency to local |
| Bank sell rate | Bank charges you this when you buy foreign currency (higher than mid) | Buying foreign currency for travel |
The gap between buy and sell rates is the spread — the bank's profit margin. Expect to get 0.5–3% less than the mid-market rate when exchanging through a bank or exchange service.
Major Currency Codes Reference
| Currency | Code | Symbol |
|---|
| US Dollar | USD | $ |
| Euro | EUR | € |
| British Pound | GBP | £ |
| Japanese Yen | JPY | ¥ |
| Chinese Yuan | CNY | ¥ |
| Hong Kong Dollar | HKD | HK$ |
| Taiwan Dollar | TWD | NT$ |
| Singapore Dollar | SGD | S$ |
| Australian Dollar | AUD | A$ |
| Korean Won | KRW | ₩ |
Where to Exchange Currency: Fee Comparison
| Exchange Method | Typical Spread / Fee | Best For |
|---|
| Bank branch | 1–3% | Large amounts, cash needed |
| Bank app / online | 0.5–1% | Better than branch, convenient |
| Airport / hotel | 3–8% | Emergency only — always the worst rate |
| Wise (international transfer) | ~0.4% | Best for international transfers |
| Credit card abroad | 1–3% FX fee | Small purchases — check if your card waives fees |
Travel Money Tips
- Exchange before you travel — Airport rates are consistently 3–5% worse than bank rates
- Use a no-FX-fee card — Many travel credit cards waive foreign transaction fees entirely
- Avoid dynamic currency conversion — When a foreign ATM or terminal asks "pay in your home currency?" always say no; you'll get a worse rate
- Use Wise or Revolut for transfers — Significantly cheaper than bank wire transfers for international money movement
Frequently Asked Questions
Why does the exchange rate change constantly?
Currency markets trade 24 hours a day, 5 days a week across global financial centers. Supply and demand shift continuously based on economic data releases, central bank decisions, geopolitical events, and trader sentiment — causing rates to move by the second.
What is a "strong" vs "weak" currency?
A "strong" currency buys more foreign currency (e.g., a strong USD means more foreign goods for the same dollars). A "weak" currency means exports are cheaper for foreign buyers, which can boost a country's trade competitiveness. Neither is inherently good or bad — it depends on context.
The tool.tl converter uses near-real-time mid-market rates updated every few minutes — accurate for reference and calculation. Actual transaction rates at banks or exchange services will differ by the spread. For trading or large transfers, always confirm the live rate with your bank or transfer service at the moment of transaction.