Convert square metres to Bigha

Why one word covers many areas

The bigha predates the survey systems that now record it. When colonial revenue settlements mapped existing holdings, they generally recorded the local bigha as it stood rather than imposing a single value, because revenue was assessed on productive capacity and the local unit already encoded that. The result is a unit whose value is a fact about a place, not about a measurement system.

The commonly cited pucca bigha of about 2,508 m² (roughly 27,000 sq ft) reflects Uttar Pradesh practice. Bihar, West Bengal, Assam, Gujarat and Rajasthan each work to different figures, and within states the kaccha bigha — often one-third of the pucca — coexists with it in village usage.

Reading a land record correctly

Every reliable bigha conversion starts from the document, not the unit. The khasra, khatauni or record-of-rights that describes the plot will normally state the area in the local unit and, in digitised records, in square metres or hectares alongside it. Where both appear, the metric figure is the operative one for registration and stamp duty; the bigha figure is the one the parties will actually negotiate in.

When only the traditional figure exists, the conversion has to be sourced from the state revenue manual in force at the date of the record. Applying today's state value to a nineteenth-century settlement record is a common and expensive error, because several states revised their standard bigha during metrication.

Sub-units and how they fail

The bigha subdivides into katha (or biswa) and then dhur, and the subdivision count is as local as the bigha itself. West Bengal commonly uses 20 katha to the bigha; parts of Bihar also use 20 katha but of a different size; several districts use 20 biswa instead. Because the sub-unit is defined as a fraction of the local bigha, an error in the bigha propagates straight through it — the two cannot be cross-checked against each other.

The one useful internal check is total holding size. If a converted plot area is wildly out of line with the surrounding parcels in the same record, the bigha variant is usually wrong before the arithmetic is.

Where a holding has been subdivided repeatedly, each generation of partition may have used the sub-unit convention current at the time, so a modern total reconstructed from old fractions can drift from the parent area. Reconciling against the registered metric area of the parent plot, rather than summing the children, is the only reliable way to close the books on such a record.

Where the variation actually bites

Three situations carry real financial exposure: agricultural sale agreements written in bigha and registered in square metres, compensation calculations under land acquisition, and inheritance partitions where a single holding is split between heirs using different local conventions. In all three the difference between a UP pucca bigha and a West Bengal bigha is close to a factor of two.

The defensible practice is to state the variant explicitly in the agreement — "one bigha as defined in the [district] record-of-rights, being X square metres" — so that the conversion becomes part of the contract rather than an assumption underneath it.

Buyers should also verify the converted area against the plot's physical dimensions where a survey plan exists. A boundary walk with a tape is crude, but it catches the order-of-magnitude errors that a purely documentary conversion cannot, and it is the check most disputes turn out to have skipped.

Common mistakes to avoid

• A bigha figure with no district attached is not a measurement; treat it as a placeholder until the record is checked.
• Pucca and kaccha bigha differ by roughly three to one in the same locality.
• Historic settlement records may use a state value that has since been revised — convert with the value in force at the record date.
• Katha and biswa are fractions of the local bigha, so they cannot be used to verify it.