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How Currency Conversion Works — Exchange Rates Explained Simply

Understand how currency exchange rates work, what mid-market rate means, why banks charge more, and how to get the best rates when converting money.

OurDailyCalc Team 5 min read

Every time you buy something in a foreign currency, send money abroad, or travel internationally, a currency conversion happens. Understanding how rates work helps you avoid overpaying.

The basic math

Converted Amount = Original Amount × Exchange Rate

If 1 USD = 83.5 INR, then:

  • $100 → ₹8,350
  • ₹10,000 → $119.76 (divide by 83.5)

What is the mid-market rate?

The mid-market rate (also called interbank rate) is the midpoint between the buy and sell prices on global forex markets. It’s the “true” exchange rate — and it’s what you see on Google or Reuters.

No consumer service gives you this exact rate. They all add a markup (spread):

  • Banks: 2–5% markup
  • Airport exchanges: 5–12% markup
  • Money transfer services: 0.5–2% markup
  • Credit cards: 1–3% + possible foreign transaction fee

How to get the best rate

  1. Compare providers — Never use the first option you find
  2. Avoid airports — Worst rates, captive audience
  3. Use a multi-currency card — Wise, Revolut offer near mid-market rates
  4. Pay in local currency — When given the choice abroad, always choose local currency (avoid Dynamic Currency Conversion)
  5. Time large transfers — Rates fluctuate; for big amounts, watching trends can save hundreds

What moves exchange rates?

  • Interest rates — Higher rates attract foreign investment → stronger currency
  • Inflation — Lower inflation → stronger purchasing power → stronger currency
  • Trade balance — More exports than imports → demand for currency rises
  • Political stability — Uncertainty weakens currency
  • Market sentiment — Short-term speculation moves rates daily

Cross-currency conversion

To convert between two non-USD currencies (e.g., INR to EUR), most systems use USD as an intermediate:

INR → USD: Amount / INR_rate
USD → EUR: Amount × EUR_rate
Combined: Amount × (EUR_rate / INR_rate)

This is called a “cross rate.”

Convert between 30+ currencies with the OurDailyCalc currency converter.

TL;DR

  • Conversion = amount × exchange rate
  • Mid-market rate is the “true” rate; services add a markup
  • Banks: 2–5% markup. Specialists (Wise): 0.5–1%
  • Always pay in local currency when abroad
  • Compare multiple providers before transferring large amounts
#currency converter #exchange rate #forex #money transfer
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OurDailyCalc Team

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