About Bikram Sambat and this converter
Nepal's official calendar is Bikram Sambat (विक्रम सम्वत्), roughly 56–57 years ahead of the Gregorian (AD) calendar, with months whose lengths vary year to year — which is why converting dates by mental arithmetic goes wrong so easily. This converter uses the standard published BS calendar tables, covering 1980–2099 BS (about 1944–2043 AD), and converts instantly in both directions.
How to convert dates
- Today's date in both calendars is shown at the top automatically.
- BS → AD: pick the Nepali year, month and day, then press Convert to AD. The day list adjusts to each month's real length.
- AD → BS: pick any date on the calendar input and press Convert to BS.
- Both directions show the weekday, in English and Nepali.
Where you'll need it
- Citizenship, passport and visa forms that ask for dates in the other calendar.
- Converting a birth date from a Nepali birth certificate for foreign documents — pair it with the Age Calculator.
- Official Nepali documents, land records and academic certificates, which use BS dates.
- Planning around Nepali festivals and fiscal years (the Nepali fiscal year starts in Shrawan).
Frequently asked questions
What date range does the converter support?
1980–2099 BS, roughly 1944–2043 AD — covering practically every birth certificate, citizenship document and official record in use.
Why is Nepal's calendar about 57 years ahead?
Bikram Sambat begins from 57 BC, credited to Emperor Vikramaditya. A new BS year starts in mid-April (1 Baishakh), which is why the gap is 56 years for part of the year and 57 for the rest.
Why do BS month lengths change every year?
Bikram Sambat months follow the sun's actual movement through the zodiac, so a month can have 29 to 32 days and varies year to year. That's why converters use published calendar tables rather than a formula.
Is this converter accurate for official documents?
It uses the standard published BS calendar data that Nepali calendars and government offices follow. For legal filings, always cross-check critical dates with the official calendar.