How Currency Exchange Rates Work — A Simple Guide

What is an Exchange Rate?

An exchange rate is the price of one country's currency expressed in terms of another. You can calculate live conversions instantly using our real-time currency converter which updates rates from the European Central Bank. For example, if USD/INR = 83.5, you need ₹83.50 to buy one US dollar. Exchange rates fluctuate continuously based on supply and demand in the global foreign exchange (forex) market — the world's largest financial market, with over $7 trillion traded daily.

What is the Mid-Market Rate?

The mid-market rate (also called the interbank rate or spot rate) is the exact midpoint between the buy and sell prices of a currency. It is the fairest, most accurate exchange rate and is what our currency converter uses — sourced live from the European Central Bank via the Frankfurter API.

Banks and exchange services always add a spread on top of this rate as their profit margin. This is why the rate you get at a bank is always worse than the mid-market rate.

What Makes Exchange Rates Change?

• Interest rates: Higher interest rates attract foreign investment, increasing demand for the currency and raising its value.
• Inflation: Countries with lower inflation tend to see currency appreciation over time.
• Political stability: Political uncertainty causes capital flight and currency depreciation.
• Trade balance: Countries that export more than they import have stronger currencies (more foreign demand).
• Speculation: Traders betting on future rate movements account for the majority of daily forex volume.
• Central bank intervention: The RBI (India), Fed (USA) and ECB (Europe) can influence rates through policy decisions and direct market intervention.

Best Practices for Currency Exchange in India

• Use a forex card for international travel — rates are typically better than cash exchange.
• Compare rates on BookMyForex, Wise or your bank before any large conversion.
• Avoid airport counters — their rates are often 5–10% worse than the best available rates.
• Check TCS rules — India levies Tax Collected at Source (TCS) on foreign remittances above ₹7 lakh under LRS.