The Iranian currency is called Rial (IRR); however, people trade in Tooman. It is easy to convert a Rial to a Tooman simply remove a zero from the price, so 10,000 rials are 1,000 Toomans. The exchange rate of the foreign currency fluctuates, so for the current rate: http://www.oanda.com/. We also offer you a Whypersia card and then convert your money to the Rial and deposit it on the card that you can use everywhere until the end of your journey.
Note: You can not use international bank cards such as a Visa Card or a Master Card and a traveler’s check.