Bihar Land Measurement Units
Bihar does not share one national "standard Bigha." Revenue offices, farmers, and city brokers may use different unit sizes — and the wrong assumption can change an quoted plot area by 25% to 400%. This hub lists every variable unit BhumiMeter tracks for Bihar, with square-foot, acre, and square-metre equivalents computed from our verified data file (not AI estimates). Use the pre-set converter below, then cross-check on Bihar Bhumi before paying earnest money.
Official unit sizes in Bihar
Square feet per 1 unit — plus acre & square metre from BhumiMeter's conversion engine.
| Unit | Sq ft | Acre | Sq m | Notes |
|---|---|---|---|---|
| Bigha | 27,225 | 0.625 | 2,529.29 | Patna std; some sources round to 27220 |
| Katha (Patna) | 1,361.25 | 0.03125 | 126.4644 | — |
| Biswa | 1,361.25 | 0.03125 | 126.4644 | UP/Bihar type |
| Biswansi | 68.0625 | 0.001563 | 6.3232 | 1/20 of Biswa — computed from state Biswa value |
District-specific variants
Muzaffarpur
| Unit | Sq ft | Acre |
|---|---|---|
| Katha (Muzaffarpur) | 1,901.25 | — |
West Champaran
| Unit | Sq ft | Acre |
|---|---|---|
| Katha (West Champaran) | 3,267 | — |
Bihar land unit converter
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What brokers & patwaris actually use
Bihar patwari records typically use a 20-katha Bigha (27,225 sq ft at Patna standard). Katha is where fraud happens — Patna, Muzaffarpur, and West Champaran each use a different Katha size, so "1 Bigha = 20 Katha" only holds when both sides agree which Katha. Decimal (435.6 sq ft) is common in broker leaflets across the Gangetic plain.
Common pitfalls in Bihar
- Using Patna Katha (1,361.25 sq ft) for Muzaffarpur land without adjustment.
- Trusting "1 Bigha = 1 acre" — Bihar Bigha is 27,225 sq ft ≈ 0.625 acre.