🏘️ Land & property
Katha to Square Feet Converter
Enter kathas and press Convert to get square feet. 1 katha in square feet is 1,361.25 in Bihar and UP. One Bihar/UP katha is 1,361.25 sq ft; a Bengal katha is 720 sq ft.
About the Katha to Square Feet Converter
Katha is the unit most often used for residential plots in Bihar, Jharkhand, Uttar Pradesh and West Bengal, and its size changes with the region. In the pucca system one katha is 1/20 bigha, or 1,361.25 sq ft. In Bengal, one katha is 720 sq ft and 20 katha make a bigha of 14,400 sq ft. In Assam a katha is 2,880 sq ft.
That spread is large enough to matter: three katha is 4,084 sq ft in Bihar but only 2,160 sq ft in Bengal — nearly half the land for the same number. Always confirm the local definition before pricing a plot.
How the calculation works
- 1 katha (Bihar/UP) = 1,361.25 sq ft = 126.4642632 m²
- 1 katha (Bengal) = 720 sq ft · 1 katha (Assam) = 2,880 sq ft
- 20 katha = 1 bigha in the pucca system
Reference values
| Katha (Bihar/UP) | Square feet | Decimal |
|---|---|---|
| 1 katha | 1,361 sq ft | 3.126 decimal |
| 2 katha | 2,723 sq ft | 6.252 decimal |
| 3 katha | 4,084 sq ft | 9.378 decimal |
| 5 katha | 6,806 sq ft | 15.630 decimal |
| 10 katha | 13,613 sq ft | 31.260 decimal |
| 20 katha (1 bigha) | 27,225 sq ft | 62.520 decimal |
Worked examples
- 4 katha is 5,445 sq ft in Bihar — the same area as one kanal in Punjab.
- 6 katha is 8,168 sq ft, a comfortable residential plot.
- 32.4 katha make an acre, since an acre is 43,560 sq ft.
Why the state matters
Katha is 1,361.25 sq ft in Bihar and Uttar Pradesh, 720 sq ft in Bengal and 2,880 sq ft in Assam. A five-katha plot is therefore 6,806 sq ft in Patna and 3,600 sq ft in Kolkata — nearly half the land for the same number. Confirm the local definition before agreeing a price.
Common mistakes
- Assuming a national katha. There is no standard; it is set locally.
- Confusing katha with bigha. Twenty katha make a pucca bigha, so a katha is a twentieth, not a quarter.
- Converting katha to acres by dividing by 20 instead of 32.4.
A last check on the numbers: 37 Katha (Bihar/UP) works out to 50,366.25 Square foot, and reversing that with the same factor brings you back to 37 Katha (Bihar/UP). Because Katha (Bihar/UP) to Square foot is a single multiplication, any tool that gives a different figure for the same input is rounding somewhere in the middle rather than only at the end.