Can I convert BS to AD by subtracting 56 or 57 years?

Only for the year, and only roughly. From Baisakh 1 (mid-April) until 31 December the BS year is 57 ahead of the AD year; from 1 January until the end of Chaitra it is 56 ahead. The day and month never line up with a simple offset, because BS month lengths change each year. Use the table-based conversion for anything official.

Which years does the converter support?

BS 2000 to 2090, which covers roughly 1943 to 2034 AD. That range comes from the month-length data bundled with the open-source nepali-date-converter library. AD dates outside it cannot be converted.

Why does a BS month sometimes have 32 days?

Bikram Sambat months follow the sun’s movement through the zodiac, and the time the sun spends in each sign varies. Summer months such as Jestha and Asar can have 31 or 32 days; winter months such as Poush and Magh can have 29. The exact lengths for each year come from the official calendar table.

Is the result the same as Hamro Patro or the government calendar?

For civil dates, yes: it uses the same class of fixed month-length table that most Nepali calendar apps use. Festival dates set by the lunar tithi are a separate calculation and are not part of a plain date conversion.

When does the Nepali fiscal year start?

On Shrawan 1, which falls in mid-July AD. Tax years, budgets and most government deadlines are written in BS, so convert them here before putting them in an English-calendar diary.

Nepali Date Converter (BS ↔ AD)

Calculate

Nepali date (Bikram Sambat)

BS year

BS month

Day

Month lengths follow Nepal’s official BS table for each year (supported range: 2000–2090 BS).

Try:

About this calculator

Formula: BS ↔ AD = day-by-day mapping through the official Bikram Sambat month-length table · 4 inputs · step-by-step working

Nepal runs on two calendars. Citizenship cards, school certificates, land records and government notices use Bikram Sambat (BS); passports, visas, banks abroad and most software use the Gregorian (AD) calendar. This converter maps any date between 2000 and 2090 BS to its exact AD day and back, using the same published month-length table as our Nepali Age Calculator. There is no fixed offset between the two calendars, because BS months run from 29 to 32 days and change from year to year, so every conversion goes through the table.

Formula

BS ↔ AD = day-by-day mapping through the official Bikram Sambat month-length table

How to Use

Choose which calendar your date is in. For a BS date, pick the year, month (Baisakh to Chaitra) and day; the day list only shows days that exist in that month. For an AD date, pick it from the calendar. The converted date appears straight away, with the weekday and how far it is from today.

How BS and AD line up across the year

Approximate AD period for each BS month

BS month	Nepali	Approximate AD period
Baisakh	बैशाख	Mid-April – mid-May
Jestha	जेठ	Mid-May – mid-June
Asar	असार	Mid-June – mid-July
Shrawan	साउन	Mid-July – mid-August
Bhadra	भदौ	Mid-August – mid-September
Aswin	असोज	Mid-September – mid-October
Kartik	कार्तिक	Mid-October – mid-November
Mangsir	मंसिर	Mid-November – mid-December
Poush	पुष	Mid-December – mid-January
Magh	माघ	Mid-January – mid-February
Falgun	फाल्गुन	Mid-February – mid-March
Chaitra	चैत्र	Mid-March – mid-April

The exact start day of each month moves by a day or two from year to year. Use the converter above for exact dates.

Where you will need a BS ↔ AD conversion

Passport, visa and foreign university forms that ask for your date of birth in AD when your Nagarikta shows BS.
Government, Loksewa and exam notices that give deadlines in BS.
Land, tax and bank documents dated in BS that you need to match to an AD statement.
Planning around fiscal-year dates: the Nepali fiscal year runs from Shrawan 1 to the end of Asar.

FAQs

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