Use our currency converter to convert over 190 currencies and 4 metals. To get started enter the values below and calculate today’s exchange rates for any two currencies or metals. Exchange rates fluctuate continuously due to the ever changing market forces of supply and demand. Forex traders buy a currency pair if they think the exchange rate will rise and sell it if they think the opposite will happen. The Forex market remains open around the world for 24 hours a day with the exception of weekends.