Convert Gaj to Katha
The katha is not a fixed size — it varies by state. Across the states below, 1 gaj = 0.003125–0.025 katha. Pick your state for an accurate result; it runs entirely in your browser.
Gaj to Katha by state
Because the katha differs from state to state, the table below gives the value in each state we cover. The square-foot column is the standard defining value; the metre and conversion columns are computed from it.
| State / region | 1 Katha (sq ft) | 1 Katha (m²) | 1 Gaj → Katha | 1 Katha → Gaj |
|---|---|---|---|---|
| Bihar | 1,361.25 | 126.4643 | 0.00661157 katha | 151.25 gaj |
| West Bengal (rural) | 720 | 66.89019 | 0.0125 katha | 80 gaj |
| West Bengal (Kolkata) | 360 | 33.44509 | 0.025 katha | 40 gaj |
| Assam (1 bigha = 5 katha) | 2,880 | 267.5608 | 0.003125 katha | 320 gaj |
| Jharkhand (Ranchi) | 720 | 66.89019 | 0.0125 katha | 80 gaj |
| Madhya Pradesh | 600 | 55.74182 | 0.015 katha | 66.66667 gaj |
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 gaj and katha
Gaj: A gaj is a square yard (9 sq ft) — the everyday unit for plots and houses across North India.
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.
Frequently asked questions
- How many katha are in 1 gaj?
- It depends on the state, because the katha is not a fixed size. In Bihar, 1 gaj = 0.00661157 katha. Across the states listed, the answer ranges from 0.003125 to 0.025 katha — choose your state in the converter above for an accurate result.
- Why does the katha vary by state?
- The katha is a traditional unit recorded differently in each state's revenue system, and many states use a larger "pucca" and a smaller "kachha" version. There is no single national value, so the only correct conversion is the one for your specific state or district.
- How do I convert gaj to katha?
- Pick your state above so the tool uses that state's katha value, then type the amount. For example, in Bihar, multiply gaj by 0.00661157 to get katha.
- Which states is the katha used in?
- This converter covers: Bihar; West Bengal (rural); West Bengal (Kolkata); Assam (1 bigha = 5 katha); Jharkhand (Ranchi); Madhya Pradesh. For legal or property transactions, always confirm the local value against your revenue records (patwari / tehsil).
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 gaj = 0.00661157 katha.
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 gaj 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.