The Nepalese Embassies or Consulates and immigration offices readily provide a sixty days visa upon presentation of a valid passport, two passport-size photos, and a payment equivalent to US$ 25 for a Single Entry Visa for 15 days, US$ 40 for a Single Entry Visa for 40 days and US$100 for Single Entry Visa for 90 days. Children below 10 years do not require visa fees and Indian citizens do not require a visa for entry. Nepal extends its visa to citizens of any country.
For updates, please visit the official page of Nepal Immigration