Forex and Banks

Foreign currencies must be exchanged only through banks or authorized foreign exchange dealers. The receipts from such transaction are to be obtained and retained. Visitors can exchange money at the foreign exchange counter at the airport upon arrival also. 

NOTE FOR TRAVELERS FROM INDIA/ VIA INDIA:
Indian currency of Rs.500 and Rs.1, 000 bills are not allowed to be brought into Nepal. They will not be exchanged and will not be accepted for transaction of any kind. 

Cards
Credit cards like the American Express, Visa and Master Card are accepted. Convertible currencies are as follows: Dollar (U.S., Australian, Hong Kong, Canadian, and Singapore); Euro (Swiss, French, Belgium, Netherlands, Germany, Italy); Pound (U.K.); Yen (Japan). Please keep hold of your encashment for changing back local currency into foreign currency on departure at exit points or at Tribhuvan International Airport departure lounge.

Cash Machines
The mainstream banks in Kathmandu and Pokhara all have a cash machine where you fill your wallet 24 hours a day using your normal bankcard or Master Card / Visa. Banks have cash machines, though we would recommend only using these machines during bank opening hours so as not to run the risk of losing your card if the system crashes.

Banks in Kathmandu Valley are open between 9:30 a.m. to 2:30 p.m. from Sunday through Friday. They are closed on Saturdays and other public holidays. In other places banks are open from 10 a.m. to 2:30 p.m. from Sunday to Friday and are closed on Saturdays and government holidays. ATM machines are located in many banks in the capital. Money can be transferred from other parts of the world from the numerous transfer agencies in the capital.
  
For more information:
Currency Converter: http://www.oanda.com/convert/classic 
Foreign Currency Exchange Rates: http://www.kantipuronline.com/forex.php