Cent, Ground and Kuzhi: Tamil Nadu’s Land Units, Converted

Cross the state line on the Sarjapur–Hosur corridor and the vocabulary for land changes completely. Karnataka counts in acres and guntha. Tamil Nadu counts in cents and grounds, keeps its records in hectares and ares, and carries a set of older customary units underneath both.

Two of those units are exact. The rest are not, and knowing which is which is the whole point of this page.

The conversions that are fixed

Each line is division, not opinion. An acre is 43,560 square feet; a hundredth of it is 435.6; a ground is defined as 2,400 square feet, so an acre holds 18.15 grounds and a ground is 2,400 divided by 435.6, which is 5.51 cents.

The cent, and why plot sizes are quoted in it

The cent is the working unit for house sites across Tamil Nadu. It is small enough to describe a single plot without decimals — a plot is three cents or five cents, rather than 0.03 acres — and it divides an acre cleanly.

• 2 cents is 871.2 square feet.
• 3 cents is 1,306.8 square feet.
• 5 cents is 2,178 square feet.
• 10 cents is 4,356 square feet, one tenth of an acre.

The reverse conversion is the one people get wrong in a hurry: divide square feet by 435.6, not by 435. A 1,200 square foot plot is 2.755 cents, not 2.76 and not 2.75 — and on a transaction the third decimal is the difference between the document and the drawing.

The ground, and where it belongs

The ground is a city unit by origin and is still how residential land is quoted in and around Chennai. At 2,400 square feet it is roughly the footprint the older urban house sites were laid out to.

Away from the metropolitan area, including on the Krishnagiri side of the corridor, the cent does almost all the work and the ground appears mostly in conversation. If a seller quotes a ground, ask for the same extent in cents and in square metres, then check the two against each other.

The kuzhi, and the units that are not fixed

The kuzhi is a customary unit, and its square-foot value is not uniform across Tamil Nadu. It is commonly quoted at 144 square feet, and other localities work to a different figure. The same is true of the older aggregate units built on it.

That is not a reason to distrust an old record; it is a reason not to convert one from a general table. Where a document states an extent, the stated extent governs. If a family record describes land in kuzhi, the number that matters is the extent now recorded against the survey number, not the arithmetic of a unit whose size varies with where you are standing.

What the record itself says

Tamil Nadu keeps its land records in metric. A patta states the extent against each survey and subdivision number in hectares and ares — not in cents and not in grounds. The chitta and adangal record who holds it and what is grown on it, and the FMB sketch records the shape and the boundaries of the subdivision.

So a plot advertised as five cents should be traceable to an extent of about 0.0202 hectares, or 2.02 ares, against a specific subdivision number. If nobody can produce that line, you have a price and a picture, but you do not yet have a parcel.

Section 10 of the Legal Metrology Act, 2009 is the reason the record is metric at all: it prohibits expressing a dimension in any transaction otherwise than in the standard unit, and for area that unit is the square metre. Cents and grounds are how people talk. Hectares and ares are how the state writes it down.

Why the two states count differently at all

The difference is not arbitrary. The Karnataka side divides the acre into forty parts and the Tamil Nadu side into a hundred, and each division suited the scale of holding the unit was invented to describe. A fortieth of an acre is a workable field unit; a hundredth is a workable house-site unit.

The practical fallout is that the two systems produce different rounding habits. A Karnataka extent lands on whole guntha and looks tidy; the same parcel in cents rarely does. Neither is more accurate than the other, and converting between them should always be done from the acre rather than from a memorised square-foot figure, so a rounding error has nowhere to accumulate.

Converting between the two states without an error

Buyers looking at both sides of the corridor end up holding a Karnataka extent and a Tamil Nadu one at the same time. The bridge is the acre, and it is the only bridge worth using.

One guntha being exactly two and a half cents is the cleanest fact in the whole comparison, and it falls straight out of the definitions: a fortieth of an acre against a hundredth of an acre. The same arithmetic, run on your own figures, is what the land area converter on this site does.

What to check before you accept a plot extent

• The extent in hectares and ares as the patta records it, against the survey and subdivision number — not the cent figure on the layout drawing.
• The FMB sketch for that subdivision, so the extent is attached to a shape on the ground.
• Which authority approved the layout, and which register the project sits in. A plotted development in Krishnagiri district is registered with the Tamil Nadu regulator, not the Karnataka one; section 3(1) of the Real Estate (Regulation and Development) Act, 2016 is what makes registration in the right register a precondition for marketing at all.
• The same extent stated back to you in square feet, so a mistake in the cent-to-square-foot step has somewhere to show up.

SUYUG’s plotted community sits at Belathur in Krishnagiri district, Tamil Nadu, registered under the Tamil Nadu regulator rather than Karnataka’s. The jurisdiction, the regulator and the register are set out on the Bagalur, Krishnagiri page, and the plotted product itself on the villa plots page. Both are worth reading before converting a single cent, because the unit you use follows the state you are buying in.