Bikram Sambat (BS) is the official calendar of Nepal, running roughly 56-57 years ahead of the English (Gregorian/AD) calendar. Unlike the Gregorian calendar, where every month has a fixed number of days, Bikram Sambat months vary in length from year to year based on a lunar-solar calculation, which is why converting between the two systems requires a lookup table rather than a simple formula.

• Choose "AD → BS" to convert an English date to Bikram Sambat, or "BS → AD" for the reverse.
• Enter the date using the date picker (for AD) or year/month/day fields (for BS).
• Click "Convert" to see the result instantly, including the Devanagari script version.

Government and Legal Documents

Official Nepali documents — citizenship certificates, land ownership papers, court documents — typically use Bikram Sambat dates, while many international forms require the Gregorian equivalent.

Birth Dates and Age Calculation

Many Nepalis need to convert their BS birth date to AD (or vice versa) for school admissions, passport applications, or international paperwork.

Business and Banking

Nepali fiscal years and many local business records run on the BS calendar, while international transactions and reporting often require AD dates.

This converter uses a verified calendar dataset covering BS years 1970 to 2090 (roughly AD 1913 to 2034), tested against tens of thousands of reference date pairs to ensure accuracy in both directions.

Why can't dates be converted with a simple formula?
Because Bikram Sambat month lengths vary year to year (unlike the fixed Gregorian calendar), an accurate converter needs a data table of actual month lengths rather than a fixed mathematical formula.

What if my date is outside the supported range?
Dates before approximately 1913 AD or after 2034 AD (BS 1970-2090) aren't currently supported, though this covers the vast majority of practical use cases including everyone alive today.