About this converter
This tool reverses the Bangla calendar back into the standard Gregorian (English) calendar. Enter the Bangla day, choose one of the 12 Bangla months, and type the Bangla Sambat (BS) year — the page returns the matching English date along with the weekday and ISO-format equivalent.
How the reverse conversion works
Each Bangla month has a fixed Gregorian start date in the Bangladesh civil reckoning: Boishakh starts on 14/15 April, Jyaistha on 16 May, Ashar on 16 June, and so on. To get the Gregorian date for a Bangla date, the tool finds the start date of the chosen Bangla month and adds (day − 1) days.
Worked example
Take 1 Boishakh 1433 BS (Pohela Boishakh, Bangla New Year). Boishakh starts on 14 April in the Bangladesh civil version, and BS 1433 corresponds to Gregorian 1433 + 593 = 2026. So 1 Boishakh 1433 = 14 April 2026.
Bangla Sambat year offset
The Bangla calendar era — Bangla Sambat or BS — started in 593 CE under Emperor Akbar, who realigned the existing Bengali calendar to the Hijri year. For Bangla months from Boishakh through Poush (April – December), the Gregorian year = BS + 593. For Magh through Choitro (January – mid-April), Gregorian year = BS + 594.