The official currency is the Qatari Riyal (QR), which divides into 100 Dirhams. Banknote denominations include 1, 5, 10, 50, 100, and 500. Coinages included 25 and 50 dirhams. The Riyal exchange rate is pegged to the US Dollar at QR 3.65.
For updates on currency exchange rates, you may consult several currency converter websites including this one.
ATM machines are available in hotels and most commercial areas, such as shopping malls. Credit cards are accepted at all major hotels and most shops. Banks are generally open from 07:30 to 13:00, Sunday through Thursday.