Currency Conversion Guide: Exchange Rates Explained
Whether you're travelling, sending money abroad, or doing business internationally, understanding currency conversion helps you get the best deal and avoid hidden costs.
What Is an Exchange Rate?
An exchange rate is the price of one currency expressed in terms of another. For example, if 1 USD = 83.50 INR, it means you need ₹83.50 to buy one US dollar.
Exchange rates fluctuate constantly based on global supply and demand, economic indicators, interest rates, geopolitical events, and market sentiment. They are set by the foreign exchange (forex) market, which trades over $7 trillion per day — the largest financial market in the world.
How Currency Conversion Works
Convert $500 | Rate: 1 USD = ₹83.50
Result = 500 × 83.50 = ₹41,750
Convert ₹10,000 | Rate: 1 INR = 0.011 EUR
Result = 10,000 × 0.011 = €110
1 USD = ₹83.50 | 1 GBP = ₹106.20
1 USD in GBP = 83.50 ÷ 106.20 = 0.786 GBP
Types of Exchange Rates
Spot Rate
The current market rate for immediate exchange. This is what online currency converters typically show — the 'interbank' rate used between major banks.
Mid-Market Rate
The midpoint between buy and sell rates. The fairest benchmark — shown by Google, XE.com, and our calculator. Banks and services charge more than this.
Buy Rate
The rate at which a bank or exchanger buys foreign currency from you. Lower than the mid-market rate — the difference is their profit.
Sell Rate
The rate at which a bank or exchanger sells foreign currency to you. Higher than mid-market. The spread between buy and sell rate is typically 1–5%.
Forward Rate
A rate agreed today for a future transaction. Used by businesses to hedge against exchange rate risk when dealing internationally.
What Moves Exchange Rates?
Getting the Best Rate: Practical Tips
Major World Currency Codes
Frequently Asked Questions
How are currency exchange rates determined?
Exchange rates are determined by supply and demand in the global foreign exchange (forex) market, which trades over $7 trillion per day. Key factors include interest rate differentials between countries, inflation, trade balances, political stability, and market speculation.
What is the mid-market rate?
The mid-market rate (also called the interbank rate) is the midpoint between the buy and sell prices for a currency. It is the fairest benchmark and is shown by Google, XE.com, and our converter. Banks and exchange services typically charge rates worse than this and keep the difference as profit.
Why do banks charge more than the mid-market rate?
Banks and currency exchange services mark up the exchange rate to earn profit — this is called the 'spread'. The gap between the mid-market rate and the rate offered to customers can be 1–5% for banks, and 10–15% or more at airport exchange counters.
What is Dynamic Currency Conversion (DCC)?
DCC occurs when you pay by card abroad and the merchant or ATM offers to convert the transaction to your home currency on the spot. This always uses a worse exchange rate. Always choose to pay in the local currency — your home bank's conversion will be cheaper.
How can I get the best exchange rate?
Avoid airport exchange counters (worst rates). Use zero-forex-fee travel cards like Niyo or multi-currency cards. For international transfers, use specialist services like Wise (TransferWise) or Remitly — they charge 5–8× less than traditional banks. Always check the mid-market rate first as your benchmark.
How often do exchange rates change?
Exchange rates change continuously during forex market trading hours. The forex market operates 24 hours a day, 5 days a week across global financial centers (Sydney, Tokyo, London, New York). Major news events, central bank announcements, and economic data releases can cause sudden large movements.
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