Currency Guides

Practical explanations of exchange-rate terminology, provider pricing, travel money and historical-rate documentation.

What Is an Exchange Rate?

Learn what an exchange rate measures, how currency direction works and why quoted rates differ across dates and providers.

Understand the difference between a published reference exchange rate and the customer rate offered by a bank or payment provider.

Learn how the difference between a reference rate and a provider rate can affect the amount received in a currency conversion.

See why a bank, card or transfer service may use a different exchange rate from a published reference rate.

Compare fixed, floating and managed exchange-rate arrangements without treating the labels as forecasts or investment signals.

Learn how ISO 4217 three-letter currency codes identify monetary units and why a currency code is not always the same as a country code.

Compare cash, card and ATM conversion costs using a reference rate while accounting for fees, markup and dynamic currency conversion.

Learn how to document a historical currency conversion and distinguish a general reference rate from a rate required by accounting or tax rules.