What is the Bikram Sambat (BS) calendar?

Bikram Sambat is the official calendar of Nepal. It is a solar Hindu calendar named after the Vikramaditya dynasty. The BS year runs from mid-April to mid-April and is approximately 56 years and 8.5 months ahead of the Gregorian (AD) calendar. So BS year 2081 corresponds roughly to AD year 2024–2025.

How do I calculate my age in Nepali calendar?

First, find your birth date in BS. If you only know your AD birth date, add approximately 56 years and 8–9 months to convert it to BS. Then subtract your BS birth year from the current BS year, adjusting for whether the BS anniversary has passed this year. This calculator does the full conversion automatically.

What year is it in Nepali calendar (BS)?

The current BS year can be found by adding approximately 56 years and 8–9 months to the current Gregorian year. As of mid-2025 AD, the BS year is 2082. The Nepali New Year (Navavarsha) typically falls around April 13–14 in the Gregorian calendar each year.

What is the difference between BS and AD years?

The Bikram Sambat calendar is 56 years and approximately 8.5 months ahead of the Gregorian calendar. To convert from AD to BS, add 56 years and 8–9 months (the exact day depends on the time of year). To convert from BS to AD, subtract 56 years and 8–9 months.

What are the Nepali months called?

The 12 months of the Nepali BS calendar are: Baisakh (1), Jestha (2), Ashadh (3), Shrawan (4), Bhadra (5), Ashwin (6), Kartik (7), Mangsir (8), Poush (9), Magh (10), Falgun (11), and Chaitra (12). Each month has 29–32 days depending on the year.

When does the Nepali New Year start?

The Nepali New Year (called Navavarsha or Naulo Barsa) begins in Baisakh, the first month of the BS calendar. This typically falls around April 13–14 in the Gregorian calendar, though the exact date varies by a day or two each year based on solar calculations.

Why does my Nepali age differ from my English age?

Because the calendars use different starting years and month structures, your age in BS and your age in AD can sometimes differ by one year depending on which part of the year your birthday falls in. The BS calendar month lengths also vary, which can affect the month-and-day component of your age.

Is the BS calendar lunar or solar?

The Bikram Sambat calendar is primarily solar, based on the movement of the sun through the zodiac. This distinguishes it from purely lunar calendars like the Islamic Hijri calendar. However, BS months are defined by the sun's position relative to zodiac signs, so month lengths vary between 29 and 32 days and change year to year.

How accurate is the AD to BS conversion?

The conversion from AD to BS requires exact knowledge of BS month start dates, which vary each year. The approximation of adding 56 years and 8–9 months gives a close result for most dates, but for precise official purposes — such as legal documents or government records in Nepal — consult an official Patro (Nepali calendar) or government source.

Everyday

Age Calculation in Nepali

Calculate your age in the Bikram Sambat (BS) Nepali calendar. Enter your Nepali birth date or English date to find your exact BS age and today's Nepali date.

Date of birth (AD / Gregorian)

Your Nepali age

—

Birth date in BS—

Today in BS—

AD age (for reference)—

NoteApproximate — see note below

Note: BS ↔ AD conversion uses an approximate formula (BS = AD + 56 years 8–9 months). For official documents and precise legal dates, use an official Nepali Patro calendar or government source.

Understanding the Nepali Bikram Sambat calendar

Nepal uses the Bikram Sambat (BS) calendar as its official civil calendar. It is one of the oldest continuous calendar systems in the world, named after the legendary King Vikramaditya and dating back over 2,000 years. While the rest of the world runs on the Gregorian (AD) calendar for international matters, Nepal's internal government records, official documents, festivals, and everyday life run on BS dates.

If you were born in Nepal, your birth certificate, citizenship card, and school records likely show a BS date. Understanding your age in BS is therefore essential for Nepali administrative purposes — school enrollment, government services, pension claims, and more all rely on BS age verification.

The BS calendar is about 56 years and 8–9 months ahead of the Gregorian calendar. So if the current Gregorian year is 2025, the current BS year is approximately 2082. The Nepali New Year (Navavarsha) begins in the month of Baisakh, which falls around mid-April in the Gregorian calendar.

A key difference from the Gregorian calendar is that BS month lengths are not fixed. They range from 29 to 32 days and change every year based on solar positioning. This means you cannot use a fixed rule like "Baisakh always has 31 days" — it depends on the specific year. For an exact day-level conversion, you need a BS calendar lookup table or official Patro.

BS to AD conversion formula

Approximate AD year from BS: AD year ≈ BS year − 56 (if month ≤ 9) AD year ≈ BS year − 57 (if month ≥ 10, before April) Approximate BS year from AD: BS year ≈ AD year + 56 (after mid-April) BS year ≈ AD year + 57 (before mid-April) Nepali New Year starts: around April 13–14 (AD)

Worked example

Input	Value
AD birth date	October 5, 1990
Today (AD)	March 1, 2025

AD Oct 5, 1990 → BS: October is month 6 (Ashwin), year ≈ 1990 + 56 = 2046 BS (approximate: 2047 Ashwin 18)
Today AD Mar 1, 2025 → BS ≈ 2081 Falgun 17
BS age = 2081 − 2047 = 34, check if Ashwin 18 has passed in BS 2081 — not yet (Falgun is month 11, Ashwin is month 6, so it has passed)
Nepali age ≈ 34 years

The 12 months of the Nepali calendar

BS Month	Nepali Name	Approx AD dates	Days (approx)
1	Baisakh	Apr 13 – May 14	30–31
2	Jestha	May 15 – Jun 14	31–32
3	Ashadh	Jun 15 – Jul 16	31–32
4	Shrawan	Jul 17 – Aug 16	31–32
5	Bhadra	Aug 17 – Sep 16	30–31
6	Ashwin	Sep 17 – Oct 17	29–30
7	Kartik	Oct 18 – Nov 16	29–30
8	Mangsir	Nov 17 – Dec 16	29–30
9	Poush	Dec 17 – Jan 14	29–30
10	Magh	Jan 15 – Feb 12	29–30
11	Falgun	Feb 13 – Mar 14	29–30
12	Chaitra	Mar 15 – Apr 12	29–30

Frequently asked questions

Bikram Sambat is the official calendar of Nepal. It is a solar Hindu calendar named after the Vikramaditya dynasty. The BS year runs from mid-April to mid-April and is approximately 56 years and 8.5 months ahead of the Gregorian (AD) calendar. So BS year 2081 corresponds roughly to AD year 2024–2025.
First, find your birth date in BS. If you only know your AD birth date, add approximately 56 years and 8–9 months to convert it to BS. Then subtract your BS birth year from the current BS year, adjusting for whether the BS anniversary has passed this year. This calculator does the full conversion automatically.
The current BS year can be found by adding approximately 56 years and 8–9 months to the current Gregorian year. As of mid-2025 AD, the BS year is 2082. The Nepali New Year (Navavarsha) typically falls around April 13–14 in the Gregorian calendar each year.
The Bikram Sambat calendar is 56 years and approximately 8.5 months ahead of the Gregorian calendar. To convert from AD to BS, add 56 years and 8–9 months (the exact day depends on the time of year). To convert from BS to AD, subtract 56 years and 8–9 months.
The 12 months of the Nepali BS calendar are: Baisakh (1), Jestha (2), Ashadh (3), Shrawan (4), Bhadra (5), Ashwin (6), Kartik (7), Mangsir (8), Poush (9), Magh (10), Falgun (11), and Chaitra (12). Each month has 29–32 days depending on the year.
The Nepali New Year (called Navavarsha or Naulo Barsa) begins in Baisakh, the first month of the BS calendar. This typically falls around April 13–14 in the Gregorian calendar, though the exact date varies by a day or two each year based on solar calculations.
Because the calendars use different starting years and month structures, your age in BS and your age in AD can sometimes differ by one year depending on which part of the year your birthday falls in. The BS calendar month lengths also vary, which can affect the month-and-day component of your age.
The Bikram Sambat calendar is primarily solar, based on the movement of the sun through the zodiac. This distinguishes it from purely lunar calendars like the Islamic Hijri calendar. However, BS months are defined by the sun's position relative to zodiac signs, so month lengths vary between 29 and 32 days and change year to year.
The conversion from AD to BS requires exact knowledge of BS month start dates, which vary each year. The approximation of adding 56 years and 8–9 months gives a close result for most dates, but for precise official purposes — such as legal documents or government records in Nepal — consult an official Patro (Nepali calendar) or government source.