๐ How Rare Are You in Bangladesh?
๐ง๐ฉ Genetic Landscape of Bangladesh
Bangladesh's genetic profile reflects its position in the Bengal delta โ a region shaped by Indo-Aryan, Dravidian, Tibeto-Burman, and Austroasiatic migrations. The country has one of the world's highest B blood type frequencies (~35%), a marker of Central/South Asian ancestry. Despite appearing genetically homogeneous, there's significant variation between Bengalis, the Chakma hill people, and the Rohingya. Bangladesh is one of the most densely populated countries on Earth, yet genetic diversity remains considerable.
The land itself will not hold still. The Padma, Jamuna and Meghna shift their channels, swallow villages and build new char islands inside a single lifetime, and families displaced by the water resettle wherever there is ground, which has kept the delta's population in motion for centuries rather than rooted in one village. A shared surname proves little here: many names that look like family lines, among them Chowdhury, Sarkar, Khan and Talukder, began as revenue or administrative titles, so two strangers who carry one need not share an ancestor. Regional speech is the sharper marker. Sylheti, Chittagonian and Chakma differ from standard Bengali enough that a speaker of one does not always follow a speaker of another.
📜 Twenty-Seven Peoples, Numbered by Statute
Bangladesh's Act No. 23 of 2010, assented on 12 April 2010, provides for cultural institutions for small ethnic groups, and its schedule does something most laws do not: it names the groups it covers, one by one, in numbered order. As the schedule is published on the Ministry of Law's laws database, the list runs 1 Chakma, 2 Marma, 3 Tripura, 4 Mro, 5 Tanchangya, 6 Bawm, 7 Pankhua, 8 Chak, 9 Khyang, 10 Khumi, 11 Lusai, 12 Koch, 13 Santal, 14 Dalu, 15 Usai (Usui), 16 Rakhain, 17 Manipuri, 18 Garo, 19 Hajong, 20 Khasia, 21 Mong, 22 Oraon, 23 Barman, 24 Pahari, 25 Malpahari, 26 Munda, and stops at 27 Kol. Section 19 of the same Act lets the government amend that schedule by notification in the official gazette, so it is a working legal list rather than a fixed one.
That matters for the tables below. Every percentage on this page is a single national average, while this one statute numbers twenty-seven groups separately — and it lists them for the purposes of that Act, not as a roll of everyone in the country. An average taken across a whole country is not a description of any group inside it.
๐๏ธ Eye Color
| Dark Brown | 85% |
| Brown | 12% |
| Other | 3% |
๐ Hair Color
| Black | 92% |
| Dark Brown | 6% |
| Other | 2% |
๐ฉธ Blood Type
| B+ | 32% |
| O+ | 30% |
| A+ | 22% |
| AB+ | 8% |
| B- | 3% |
| O- | 3% |
| A- | 1.5% |
| AB- | 0.5% |
Trait frequencies on this page come from public and institutional datasets โ see Data Sources.
🧮 Calculate Your Rarity in Bangladesh
Pick your eye colour, hair colour and blood type. The calculator uses Bangladesh's own figures from the tables above, not world averages.
This is an estimate, not a measurement. It multiplies three national frequencies as if they were independent, and they are not: eye and hair colour share pigmentation genes, so a combination that tends to run together, such as blue eyes with blonde hair, is more common than the multiplication suggests, while one that rarely does, such as blue eyes with black hair, is rarer. Blood type is independent of both. The frequencies are national averages from public datasets — see Data Sources.
That number describes the body you were born with. Fraeon, our other site, does the same arithmetic for the part you chose: the films, series, games, books, anime and manga you have actually finished. Start your log →
🩸 Where the Eight Blood Boxes Come From
The blood table above has eight rows, and that shape is not only biology; it is also a published national standard. The Directorate General of Health Services, under the Ministry of Health and Family Welfare, publishes the Bangladesh Core FHIR Implementation Guide for health software, and inside it sits a code system titled "Bangladesh Blood Group CodeSystem", version 0.4.6. It defines eight codes, no more: 1 is O Positive, 2 O Negative, 3 A Positive, 4 A Negative, 5 B Positive, 6 B Negative, 7 AB Positive, 8 AB Negative.
In a system built to that guide, a person's blood group is one of eight integers. It shows why some numbers on this page exist and others do not: a trait gets counted once somebody builds a box for it. That same guide publishes code systems for religion, occupation, marital status and nationality, and none at all for eye or hair colour — which is part of why those two tables here are estimates. For the arithmetic on the eight groups, see rarest blood type.
📅 The Autumn Bangladesh Recut Its Own Calendar
On Wednesday 16 October 2019 the Bangla calendar changed shape. The public administration ministry issued a circular adopting the recommendations of a special Bangla Academy committee, formed in 2015 and, as the Financial Express reported, headed by the retired Dhaka University physicist Professor Ajoy Roy. Until then the first five months carried 31 days and the remaining seven carried 30, with Falgun gaining a day in leap years. Under the revision, in the same paper's words, "the first six months will be with 31 days, Falgun 29 days (30 days in leap year), and the rest five months will have 30 days".
The point was to stop national anniversaries sliding against their Gregorian dates. After the change, 21 February, 26 March and 16 December fall on Falgun 8, Chaitra 12 and Poush 1, and are meant to keep falling there for the next hundred years. The arithmetic behind a Bangladeshi birthday was therefore rewritten within living memory. Birthday rarity uses the Gregorian one.
โญ Rare Facts About Bangladesh
What is actually behind these numbers
The blood percentages above are rounded estimates; no published count gives exactly these figures. The nearest published data is a study of 128,506 blood donors at BIRDEM in Dhaka (IMC Journal of Medical Science, July 2011), which found B 34.4%, O 30.4%, A 26.7%, AB 8.6% and 97.4% Rh positive — a donor sample rather than a national count, and a far narrower Rh split than the table shows. The 165 cm height tile matches the NCD Risk Factor Collaboration's pooled estimate for 19-year-old males in Bangladesh in 2019 (165.1 cm), which is modelled from population studies and is for that age, not for all adult men. The population tile is not the census count: the Bangladesh Bureau of Statistics enumerated 165.1 million in its 2022 census preliminary report, released on 27 July 2022. Nothing institutional stands behind the eye and hair figures, so read those as estimates. See Data Sources. Checked September 2026.