Free tool
Land unit converter: acre, sq ft, cent, guntha
Convert between all common Indian land-area units, including the ones used across Karnataka and South India. Enter a value, pick its unit, and see the equivalent everywhere else. Free, no sign-up.
How to use it
Type any value into the box and choose the unit it is in. The table instantly shows the same area in square feet, square metres, square yards, acre, hectare, cent, guntha, ground and ankanam. Tap Copy on any row to copy that value.
Common conversions
- 1 acre = 43,560 sq ft = 100 cent = 40 guntha
- 1 guntha = 1,089 sq ft (widely used in Karnataka)
- 1 cent = 435.6 sq ft (common across South India)
- 1 ground = 2,400 sq ft; 1 hectare = 1,07,639 sq ft
Frequently asked questions
How many square feet is a 30×40 site?
A 30×40 site is 1,200 sq ft. A 40×60 site is 2,400 sq ft (one ground).
Why is bigha not included?
Bigha varies significantly by district and state, so a single factor would be misleading. Confirm local units with your surveyor or sub-registrar office.
The conversions that matter in Karnataka
| Unit | Equals | Where you meet it |
|---|---|---|
| 1 acre | 43,560 sq ft | Agricultural land, large parcels |
| 1 guntha | 1,089 sq ft, and 40 guntha make an acre | The standard subdivision for agricultural land in Karnataka |
| 1 cent | 435.6 sq ft, and 100 cents make an acre | Common across South India for smaller parcels |
| 1 hectare | About 2.47 acres | Official and survey documents |
| 1 square yard (gaj) | 9 sq ft | Older documents and North Indian usage |
| 1 square metre | About 10.76 sq ft | Building bye-laws and plan approvals |
Why one property uses three different units
It is not carelessness; different systems serve different purposes. Revenue and survey records for agricultural land are kept in acres and guntha. Sites in layouts are sold in square feet, usually described by dimensions like 30×40. Building regulations work in square metres, which is why the 2026 rules describe plot thresholds as 150 and 200 sq m rather than in square feet.
So a single transaction can involve a parcel measured in guntha, a site sold in square feet, and a plan approval assessed in square metres. Converting between them accurately is not pedantry: an error of one guntha is over a thousand square feet.
A worked example
Say you are shown a parcel of 4 guntha. That is 4,356 sq ft. As sites of 30×40, which are 1,200 sq ft each, it looks like three sites with a little left over, but that is before roads, setbacks and any area surrendered during layout formation. This is exactly the arithmetic that makes unconverted agricultural land look more productive than it turns out to be, so treat the raw conversion as the start of the sum rather than the end.
Before assuming any parcel can be built on, check that it is converted and that the layout is sanctioned. Our area pages explain which authority governs each corridor, and the setback calculator shows what a site actually yields once setbacks are applied.