Convert Katha to Bigha
Both the katha and the bigha are state-variable land units, so the conversion changes by state — 1 katha = 0.05–0.2 bigha across the states below. Pick your state for an accurate result; it runs entirely in your browser.
Katha to Bigha by state
Both katha and bigha are recorded in each state's revenue system, so the only correct conversion is the one for a state where both are defined. The square-foot columns are the standard defining values; the metre and conversion columns are computed from them.
| State / region | 1 Katha (sq ft) | 1 Bigha (sq ft) | 1 Katha → Bigha | 1 Bigha → Katha |
|---|---|---|---|---|
| Bihar | 1,361.25 | 27,225 | 0.05 bigha | 20 katha |
| West Bengal | 720 | 14,400 | 0.05 bigha | 20 katha |
| Assam (1 bigha = 5 katha) | 2,880 | 14,400 | 0.2 bigha | 5 katha |
| Madhya Pradesh | 600 | 12,000 | 0.05 bigha | 20 katha |
Indian land units vary by state and even by district, and local custom can differ from the standard value. For any legal, property or financial purpose, confirm the value against your local revenue records (patwari / tehsil) before relying on it.
About katha and bigha
Katha: A katha (also spelt kattha) is the common land unit across eastern India. In most states 1 bigha = 20 katha, but in Assam 1 bigha = 5 katha, so the katha’s size varies widely by state.
Bigha: A bigha is a traditional Indian land unit whose size is not standardised — it ranges from roughly 1,500 to 2,530 m² depending on the state and on whether a "pucca" (large) or "kachha" (small) bigha is meant.
Frequently asked questions
- How many bigha are in 1 katha?
- It depends on the state. In most states 1 bigha = 20 katha, but in Assam 1 bigha = 5 katha — so a katha is a different fraction of a bigha depending on the state. In Bihar, 1 katha = 0.05 bigha; across the states listed it ranges from 0.05 to 0.2. Choose your state in the converter above.
- Are the katha and bigha the same in every state?
- Both are traditional units whose absolute size changes by state, so the land area they represent is not the same everywhere. The conversion between them also changes by state, so pick your state for an accurate result. For legal or property use, confirm against your local revenue records.
- How do I convert katha to bigha?
- Pick your state above, then type the amount in the converter — it uses that state's recorded values for both units. For example, in Bihar, multiply katha by 0.05 to get bigha.
- Which states does this katha-to-bigha converter cover?
- Both katha and bigha are recorded together in: Bihar; West Bengal; Assam (1 bigha = 5 katha); Madhya Pradesh. Other states record only one of the two units, so a reliable conversion between them isn't possible there without a local figure.
Related area conversions
See all area unit conversions →
Full state-by-state size reference (bigha, biswa, katha, dhur) →
How we calculate this — method, assumptions and limits
The exact conversion
1 katha = 0.05 bigha.
What we assume
The Katha is not a fixed size. It is defined by local revenue practice, so its area differs by state. This page defaults to Bihar; use the selector to switch, and the result changes with it.
Where the sources agree — and where they don’t
We record a confidence level for every regional value from our research pass, and we publish it rather than hiding it. High means multiple independent references matched. Medium means the value is well attested but corroboration is thinner, so treat it as indicative and confirm against your local record.
| Region | 1 katha in sq ft | Confidence |
|---|---|---|
| Bihar | 1361.25 | High |
| West Bengal (rural) | 720 | High |
| West Bengal (Kolkata) | 360 | Medium |
| Assam (1 bigha = 5 katha) | 2880 | High |
| Jharkhand (Ranchi) | 720 | High |
| Madhya Pradesh | 600 | Medium |
Because the documented values genuinely differ between regions, we show each variant instead of averaging them into a single number. An average would be wrong everywhere.
What this converter does not account for
- Local custom below state level. Districts and even individual villages can use a different working value from the state norm. The figure here is the state-level standard.
- Values marked medium confidence. These are the ones most worth checking against your own paperwork before you rely on them.
- Historic and pre-survey records. Older deeds may use a value that predates the current survey settlement for that area.
- Legal and transactional use. This is a calculation aid, not a legal document. For a sale, mutation or dispute, the figure that governs is the one in your official land record.
- Rounding in the displayed result. The underlying maths runs at full precision; what you see is rounded for readability, so a long chain of manual conversions may drift slightly.
Sources
- Department of Land Resources, Ministry of Rural Development (India) — the central department responsible for land records and the Digital India Land Records Modernisation Programme, under which the state portals below are maintained.
- Bihar Bhumi — Revenue & Land Reforms Department, Bihar — the official Bihar land-record portal; the authority for katha, dhur and dhurki values used in Bihar revenue records.
- UP Bhulekh — Uttar Pradesh land records — the official Uttar Pradesh record-of-rights portal, used to corroborate bigha and biswa values for UP.
- Wikipedia: Bigha — a cross-check on the historical spread of values, cited for corroboration rather than as a primary authority.
Where references disagree we show the documented variants rather than picking one. Every conversion factor on this site is recomputed and re-verified automatically on each build — the check confirms exact round-trips and cross-unit consistency across all pairs, so a wrong figure fails the build rather than reaching this page.