General information. Bikram Samwat era.
The era adopted in Nepal is called Bikram Samwat (also spelled as: Bikram Sambat, Vikram Samwat or Vikram Samvat; abbreviated as BS or, more often, VS). In order to get a Gregorian date out of the Bikram Samwat date, you should subtract 57 years from the BS date. For example: 2067 BS = (2067 – 57) AD = 2010 AD. This difference takes place because the Bikram Samwat calendar is believed to have been founded by Vikramāditya, a legendary emperor of Ujjain, India, in 57 BC.
Before Bikram Sambat era came into official use, another era had been used in Nepal. Historians call it Saka era (also Shaka Sambat or Shalivahana era). Its year zero begins near the vernal equinox of the year 78 AD; therefore, Saka era is 135 years “younger” than Bikram Sambat era. Some Nepalese monetary circulation experts say that Bikram Samvat has been officially introduced in Nepal on 1888 AD (this year corresponds to Saka era's year 1810 and Bikram Samwat era's year 1945).
According to other sources of information, Saka era (or Shaka Sambat era) has been discontinued in its 1823-rd year and was replaced by Bikram Samwat era for official use in its 1958-th year. Hence, the era replacement year falls on 1901 AD.
Along with Nepal itself, Bikram Samwat is nowadays widely used in the West and North-West of India as well. These are the places where in ancient times the Indo-Scythian Kingdom was located.
There’s a huge variety of way of writing of the Nepalese digits, so hereby I am giving a table providing more variants of writing these digits:

As a part of a typeface, Indian digits (which are nowadays used on the Nepalese coins) are written as follows:
| 0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
| ० |
१ |
२ |
३ |
४ |
५ |
६ |
७ |
८ |
९ |
Nepalese digits proper, being typefaced:
| 0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
| ੦ |
੧ |
੨ |
੩ |
੪ |
੫ |
੬ |
੭ |
੮ |
੯ |
To see pictures of the Sikh coins that also bear VS (Vikram Samvat) date, but written in Arabic, visit this site, called “Sikh Coins Group”, or this one.
The system of money denominations in present day Nepal.
National currency of Nepal is the Nepalese Rupee. 1 Nepalese Rupee is divided into 100 pice. Bank notes of value from 1 to 1,000 Nepalese Rupees could now be found in circulation, as well as 1-, 2- è 5-rupee coins, along with small coins valued 5, 10, 25 and 50 pice. However, coins are almost excluded from the Nepalese money circulation.
Information about most recent updates of the converter.
Update @March 24, 2011: a set of numerals has been extended in direct converting. Those newly added images of numerals are typical for old variants of the Nepalese coins.
Update @March 28, 2011: some more variants of the Nepalese numerals had been added into the direct conversion. Moreover, now both in direct and reverse conversion extra information about the corresponding yeras of the Nepalese eras is available.