Bikram Sambat (Nepali Calendar) vs Gregorian Calendar — differences, similarities, and how to convert seamlessly
✨ BS is 56.7 years ahead of AD. For precise conversion, use our free BS/AD converter →
Type: Lunisolar (based on moon phases & solar year)
Epoch: 57 BCE (Vikramaditya victory)
Used in: Nepal (official), parts of India
New Year: Baishakh 1 (mid-April)
Festivals: Dashain, Tihar, Teej based on BS tithis
Type: Solar (Earth orbit around Sun)
Epoch: 1 AD (traditional birth year of Jesus)
Used in: Worldwide civil calendar
New Year: January 1
Festivals: Christmas, Easter, fixed dates
The most striking difference: BS year = AD year + 56.7 years approximately. Example: AD 2025 corresponds to BS 2081–2082. Unlike the purely solar Gregorian, BS aligns with lunar phases, meaning month lengths vary (29–32 days) and an extra month (Adhik Maas) is added every 3 years.
| Feature | Bikram Sambat (BS) | Gregorian (AD) |
|---|---|---|
| Calendar Type | Lunisolar (moon + sun adjustments) | Solar (fixed solar year) |
| Year Offset | ~56.7 years ahead of AD | Behind BS by ~56.7 yrs |
| Month Length | 29 to 32 days (varies yearly) | 28 to 31 days (fixed pattern) |
| Leap Adjustment | Adhik Maas (extra month) every ~3 years | Feb 29 every 4 years |
| New Year Day | Baishakh 1 (usually April 13/14) | January 1 |
| Era Origin | Emperor Vikramaditya, 57 BCE | Dionysian era, 1 AD (approx) |
| Primary Region | Nepal (official administration & festivals) | Global standard for business, science |
| Festival Calculation | Based on lunar tithis & astrological positions | Fixed dates or movable (Easter) |
Below is the approximate Gregorian window for each Bikram Sambat month. Exact dates shift slightly each year due to lunisolar dynamics.
💡 Pro tip: Dashain (the biggest Nepali festival) falls in Ashwin/Kartik, while Tihar is in Kartik. In Gregorian, these usually occur between September and November.
Nepal proudly retains Bikram Sambat as its official calendar for cultural sovereignty, religious accuracy, and agricultural alignment. Unlike many countries that switched to Gregorian, Nepal's identity is deeply tied to Vikram Samvat. Government offices, school sessions, and major festivals like Dashain, Tihar, Holi are all decided according to BS dates. Even modern Nepali newspapers show both BS and AD side by side.
Converting between BS and AD is essential for travelers, businesses, and diaspora. That's why we built a lightning-fast, accurate BS to AD converter used by thousands daily.
The Bikram Sambat calendar was established in 57 BCE by Emperor Vikramaditya to commemorate his victory over the Sakas. The Gregorian calendar, on the other hand, started counting from 1 AD, roughly the birth year of Jesus Christ (as determined by medieval scholars). The difference of approximately 56.7 years arises because BS started earlier and uses a different astronomical epoch. This means if you add 56 or 57 to the AD year (with month adjustments), you get the BS year. For example: AD 2025 → BS 2081 (after Baishakh).
Understanding this gap is vital for reading Nepali historical documents, planning festivals, or using Nepali Patro for life events like weddings and bratabandha.
BS (Bikram Sambat) is a lunisolar calendar officially used in Nepal, approx 56.7 years ahead of the solar Gregorian calendar (AD). BS months start with new moons, while AD months follow fixed solar dates.
Use our dedicated BS to AD Converter. Just enter the BS year, month, and day to get the exact Gregorian equivalent. It's free, accurate, and handles complex lunisolar adjustments.
Because the Bikram Sambat era began in 57 BCE, while the Gregorian era began in 1 AD. The ~56.7 year difference is constant, though exact month offsets vary.
Both are accurate for their purposes. Gregorian is precise for solar years (365.2425 days), while BS better aligns with lunar phases and is indispensable for Hindu festivals and astrological events in Nepal.
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