| Unit | 1 unit = sq ft | Note |
|---|---|---|
| Dhur | 74.390625 | Patna 5.75 Haath standard (Haath selector adjusts live). |
| Dhurki | 3.719531 | 1 Dhurki = 1/20 Dhur. |
| Kattha | 1,487.8125 | 20 Dhur = 1 Kattha. |
| Bigha | 29,756.2500 | 20 Kattha = 1 Bigha. |
| Decimal | 435.6 | 1 Decimal = 1/100 Acre. |
| Square Feet | 1 | Universal — 1 sq ft. |
| Square Meter | 10.76391 | Universal — 1 sq m = 10.7639 sq ft. |
| Square Yard | 9 | Universal — 1 sq yd = 9 sq ft. |
| Acre | 43,560.0000 | Universal — 1 Acre = 43,560 sq ft = 100 Decimal. |
| Hectare | 107,639.1040 | Universal — 1 Hectare = 10,000 sq m. |
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Land Units used in Bihar
Bihar Land Measurement — The Laggi-Haath System
Bihar is the one Indian state where the size of a land unit is not fixed. Its primary units — Dhur, Kattha and Bigha — change depending on the district where the land sits, because each district is tied to its own Laggi-Haath value. The Haath is a traditional measure of length that the Bihar Revenue Department standardised district by district, and it sets the square footage of every local unit. Land Calculator AI is built specifically for this system: choose your district and the correct Haath is applied automatically, so your result matches Bihar's official Jamabandi and registration records instead of a generic average.
Bihar's 38 Districts and Their Standard Haath Values
Bihar's 38 districts sort into three Haath groups. The 5.75-Haath group — Patna, Bhojpur, Buxar, Rohtas and Kaimur — gives 1 Dhur = 74.39 sq ft and 1 Bigha = 29,756 sq ft. The 5.5-Haath group — Gaya, Nalanda, Jehanabad, Nawada, Aurangabad, Arwal, Muzaffarpur, Darbhanga, Vaishali, Bhagalpur, Munger, Begusarai and others — gives 1 Dhur = 68.06 sq ft and 1 Bigha = 27,224 sq ft.
The largest group sits at 5.0 Haath — Gopalganj, Siwan, Saran, Samastipur, Madhepura, Madhubani, Sitamarhi, Sheohar, Supaul, Saharsa, Purnia, Katihar, Araria, Kishanganj, Khagaria, Banka, Jamui, Lakhisarai, Sheikhpura, East Champaran and West Champaran. At 5.0 Haath, 1 Dhur = 56.25 sq ft and 1 Bigha = 22,500 sq ft. Pick the wrong group and a single Bigha can be off by thousands of square feet, which is exactly the error Land Calculator AI removes.
Bihar Land Unit Conversion Reference
The ratios between Bihar's units never change, only their square-foot value does: 20 Dhur = 1 Kattha, 20 Kattha = 1 Bigha, and 1 Dhurki = 1/20 Dhur. The national anchors stay constant everywhere — 1 Decimal = 435.6 sq ft, 100 Decimal = 1 Acre = 43,560 sq ft, 1 Square Meter = 10.764 sq ft, and 1 Hectare = 2.471 Acre. Land Calculator AI ties these together so you can turn any Bihar land-record value into Decimal, Acre or Square Meter for a bank valuation, a purchase or a legal filing.
Reading Bihar Jamabandi and Revenue Records
Bihar revenue documents — Jamabandi, Khasra-Khatauni and the Bhu-Naksha extracts from the Bhumi Jankari portal — may state area in Decimal, Kattha-Dhur or Square Meter depending on when the record was created. Older Zamindari-era papers use Bigha-Kattha-Dhur, while modern computer-generated records often show Decimal or Square Meter. Use the units table above together with Land Calculator AI to confirm the true area of any Bihar plot before a purchase, registration or partition goes ahead.