Bengali Calendar Converter — Bongabdo & Gregorian
Convert any Gregorian date to the Bengali Bangla calendar (Bongabdo) and back. The result shows the Bengali day, month name in English and Bangla script, and the year in Bangla San (BS). Furthermore, the tool flags Pohela Boishakh — Bengali New Year on 1 Boishakh (14 April) — the most important cultural celebration in Bangladesh and West Bengal. The Bengali year is approximately 593 years behind the Gregorian calendar.
How to use the Bengali Calendar Converter
The twelve Bengali months
The official Bangladesh Bengali calendar (revised 1987) has twelve months. Furthermore, the first five months have 31 days each and the remaining seven months have 30 days each. The last month, Choitro, has 31 days in Gregorian leap years.
| Month | Bangla | Days | Gregorian start |
|---|---|---|---|
| 1. Boishakh | বোশাখ | 31 | 14 April |
| 2. Joishtho | জ্যৈষ্ঠ | 31 | 15 May |
| 3. Ashadh | আষাড় | 31 | 15 June |
| 6. Ashwin | আশ্বিন | 30 | 16 September |
| 12. Choitro | চৈত্র | 30 (31 in leap) | 14 March |
How the Bengali calendar works
The Bengali year (Bongabdo) starts on 1 Boishakh — Pohela Boishakh — which falls on 14 April in the Gregorian calendar each year. Furthermore, the Bengali year is approximately 593 years behind the Gregorian year. The exact calculation depends on whether the date is before or after 14 April in any given year.
Month 1–5 = 31 days each (Boishakh through Bhadro)
Month 6–12 = 30 days each (Ashwin through Choitro)
Choitro in leap year = 31 days (Gregorian leap year alignment)
The 1987 calendar revision
Bangla Academy revised the Bengali calendar in 1987. Furthermore, this fixed Pohela Boishakh firmly on 14 April and standardised month lengths. Moreover, Choitro has 31 days in Gregorian leap years under this revision. West Bengal uses a slightly different calculation — producing month start dates 1–2 days apart from Bangladesh.
Worked example: Pohela Boishakh 2026
Pohela Boishakh — the Bengali New Year — always falls on 14 April. For 2026 CE, what Bengali date does 14 April correspond to?
| Detail | Value |
|---|---|
| Gregorian date | 14 April 2026 |
| Bengali date | 1 Boishakh 1433 BS |
| Bengali (Bangla script) | ১ বোশাখ ১৪৩৩ |
| Day of week | Tuesday |
| Bengali New Year | Pohela Boishakh 1433 BS |
What is the Bengali calendar?
The Bengali calendar (Bongabdo or Bangla San) is the official calendar of Bangladesh and also used in West Bengal. Furthermore, Mughal Emperor Akbar introduced it in 1584 CE to align taxation with Bengal's agricultural seasons. Year 1 of the Bengali calendar corresponds to 593 CE.
The calendar serves important cultural and agricultural functions. Furthermore, 1 Boishakh marks the Bengali New Year and the start of the crop sowing season. Pahela Boishakh celebrations are among South Asia's largest public festivals. Furthermore, the Mangal Shobhajatra procession at Dhaka University is UNESCO-recognised. Moreover, the calendar governs seasonal fairs and cultural events across the Bengali-speaking world.
Bengali calendar in Bangladesh and West Bengal
Bangladesh uses the revised official Bengali calendar (1987 revision by Bangla Academy). Furthermore, this version standardises month lengths and fixes Pohela Boishakh on 14 April. West Bengal uses a slightly different calculation based on astronomical sun-entry into zodiac signs — producing month start dates that differ by one or two days from the Bangladesh calendar. Moreover, both versions share the same month names, year number and cultural significance.
Why the Bengali calendar matters
Bangladesh has a population of approximately 170 million people and a significant global diaspora. Furthermore, official Bangladesh documents, national holidays and agricultural planning all reference the Bengali calendar. Understanding Pohela Boishakh (14 April) and other Bengali calendar dates is essential for businesses operating in Bangladesh or engaging with Bengali communities globally. Moreover, Eid and other Islamic holidays also appear in the Bengali calendar context in Bangladesh government communications.'},
The Bengali language — written in Bangla script — is spoken by over 300 million people worldwide, making it the seventh most spoken language on Earth. Furthermore, the Bengali calendar is a central cultural institution for this large community. Moreover, Bangla New Year (Pohela Boishakh) celebrations occur in London, New York, Toronto and many other cities with significant Bengali diaspora populations — making calendar awareness relevant globally.
Pohela Boishakh in international business context
Pohela Boishakh (14 April) is a national public holiday in Bangladesh. Furthermore, the day affects office availability, factory output and delivery schedules. Teams coordinating with Bangladeshi partners must account for this closure. Moreover, the garment manufacturing industry — for which Bangladesh is a global hub — pauses operations on Pohela Boishakh, making the date relevant for international supply chain planning.
Frequently asked questions
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Convert to the Islamic calendar. Furthermore, Eid and Ramadan dates in Bangladesh use the Hijri calendar.
→Days Until Calculator
Count days until Pohela Boishakh or any other event. Additionally, a multi-event dashboard tracks ten countdowns at once.
→Calendar Generator
Generate a monthly calendar with event markers. Furthermore, mark Pohela Boishakh and Bengali holidays directly in the grid.
→Date Difference Calculator
Exact gap between any two dates. Additionally, milestone markers show every 100th and 1000th day.
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