Get daily updated US dollar rates and currency exchange data for all world currencies. Accurate USD converter, and refreshed every 24 hours. Get Live Exchange Rates Between US Dollar (USD) and Major Currencies Including Currency Converter, Buying & Selling Rates and Historical Data The United States dollar (symbol: $; currency code: USD[a]) is the official currency of the United States and several other countries. The Coinage Act of 1792 introduced the U.S . dollar at par with the Spanish silver dollar , divided it into 100 cents, and authorized the minting of coins denominated in dollars and cents. Calculate live currency and foreign exchange rates with the free Xe Currency Converter. Convert between all major global currencies, precious metals, and crypto with this currency calculator and view the live mid-market rates.