Seven errors account for almost every bigha conversion dispute: using the national shorthand, ignoring pucca versus kaccha, ignoring the district, trusting the sub-unit, comparing across state lines, converting the price instead of the area, and never checking the record.
None of these are exotic. They are the same handful of mistakes repeating across thousands of transactions, and each has a one-line fix. Here they are in rough order of how much they cost.
1. Using '1 acre = 1.6 bigha' everywhere
This is the most repeated figure in Indian land conversion and it comes from the North Indian pucca bigha of 27,225 square feet. It is correct in eastern Uttar Pradesh, Bihar, Jharkhand and pucca Rajasthan. It is wrong everywhere else, and in some states catastrophically so.
| State | Actual bigha per acre | Error if you assume 1.6 |
|---|---|---|
| Himachal Pradesh | 5 | Understates area by 68% |
| Uttarakhand (hills) | 6.4 | Understates area by 75% |
| West Bengal | 3.025 | Understates area by 47% |
| Madhya Pradesh | 3.63 | Understates area by 56% |
| Punjab, Haryana | 2 | Understates area by 20% |
The fix: never use a bigha figure that does not name a state.
2. Not asking whether it is pucca or kaccha
In Rajasthan the two differ by 56 per cent; in Uttar Pradesh a kaccha bigha is commonly a third of the pucca. Ten bigha means 6.25 acres or 4 acres in Rajasthan depending purely on which word was meant. The Rajasthan guide sets out both figures and what the gap costs.
The fix: ask the question explicitly and get the answer written next to the area, not agreed verbally.
3. Knowing the state but not the district
Several states vary internally by more than they vary from their neighbours. Uttar Pradesh's western bigha is a quarter of its eastern one. Uttarakhand's plains bigha is 2.5 times its hill bigha. Gujarat's vigha is 16 guntha in some talukas and 20 in others.
The fix: ask for the district, and check whether your state has an internal split. The Uttar Pradesh guide covers the worst case.
4. Assuming a katha is a katha
The single most expensive assumption in eastern India
A katha is 720 square feet in West Bengal, about 1,361 in Bihar and 2,880 in Assam. Prices are usually quoted per katha, so this is the unit most likely to appear in a negotiation and the one that varies most.The same applies to the biswa, which inherits whatever ambiguity its parent bigha has, and to the guntha count inside a Gujarat vigha.
The fix: convert sub-units to square feet before you do anything else with them.
5. Comparing listings across state lines in local units
Two listings, one in Bihar at a certain rate per katha and one in West Bengal at a similar rate per katha, look comparable. The Bihar katha is nearly twice the Bengal one, so the Bengal land is roughly twice as expensive per square foot.
The fix: normalise every listing to price per square foot before comparing. It takes one division and it removes the entire class of error.
6. Converting the price instead of the area
A subtle one. If a seller quotes ₹8 lakh per bigha and you convert that to a per-acre figure using the wrong ratio, you get a per-acre price that looks reasonable and is not. Then you negotiate against the wrong benchmark.
The fix: convert the area first, then divide the total price by the converted area. Never convert a rate directly. How agents price land in bigha and acre works through the arithmetic properly.
7. Never checking the revenue record
All six mistakes above are conversion problems. This one is the meta-mistake: relying on any conversion at all when the recorded area is available and definitive.
The recorded area is what registration will reference and what a court would work from. The verification guide sets out which document to ask for in each state and how to reconcile it against the listing.
A quick diagnostic
If the listing area and the recorded area disagree, the ratio between them usually identifies the cause immediately.
| Ratio | Likely cause |
|---|---|
| ≈ 1.56 | Pucca quoted where the record is kaccha, or the reverse (Rajasthan) |
| ≈ 1.25 | Gujarat vigha counted at 20 guntha rather than 16 |
| ≈ 2 | Punjab/Haryana bigha convention mismatch, or a factor-of-two sub-unit error |
| ≈ 3 | Uttar Pradesh pucca quoted against a kaccha record |
| ≈ 4 | Katha mismatch between Assam and West Bengal, or western versus eastern UP |
| Arbitrary | Not a unit problem — check what the area includes and excludes |
For the conversions themselves, the acre to bigha calculator shows the square footage behind every ratio, and the state comparison table lists every convention side by side so you can find the one that matches your discrepancy.