1 katha in gaj is 80 gaj in West Bengal, Ranchi and Assam's Barak valley, and 151.25 gaj in Patna and Arrah. In other parts of Bihar the katha is larger, up to 363 gaj in Bettiah. These are commonly used local values, so first find out which katha your area uses.
Katha in gaj, region by region
Size of one katha by region
| Region | 1 katha in sq ft | In sq m | In gaj |
|---|---|---|---|
| West Bengal, Jharkhand (Ranchi), Assam (Barak valley) | 720 | 66.8902 | 80 |
| Bihar: Patna and Arrah | 1,361.25 | 126.4643 | 151.25 |
| Assam (Brahmaputra valley) | 2,880 | 267.5608 | 320 |
| Madhya Pradesh | 600 | 55.7418 | 66.6667 |
| Bihar: Chhapra; Jharkhand: Palamu | 1,742.4 | 161.8743 | 193.6 |
| Bihar: Hajipur and Muzaffarpur | 1,901.25 | 176.6319 | 211.25 |
| Bihar: Siwan | 1,520 | 141.2126 | 168.8889 |
| Bihar: Bettiah (West Champaran) | 3,267 | 303.5142 | 363 |
| Where | 1 katha (sq ft) | 1 katha (gaj) |
|---|---|---|
| West Bengal, Jharkhand (Ranchi), Assam (Barak valley) | 720 | 80 |
| Bihar: Patna and Arrah | 1,361.25 | 151.25 |
| Assam (Brahmaputra valley) | 2,880 | 320 |
| Madhya Pradesh | 600 | 66.6667 |
| Bihar: Chhapra; Jharkhand: Palamu | 1,742.4 | 193.6 |
| Bihar: Hajipur and Muzaffarpur | 1,901.25 | 211.25 |
| Bihar: Siwan | 1,520 | 168.8889 |
| Bihar: Bettiah (West Champaran) | 3,267 | 363 |
Bihar: one name, many sizes
Most searches for "1 kattha in gaj" come from Bihar, and Bihar is where the answer varies most. A bigha there is always 20 katha, but the katha grows as you move north and west from Patna:
- Patna and Arrah: 151.25 gaj
- Siwan: 168.8889 gaj
- Chhapra; Jharkhand: Palamu: 193.6 gaj
- Hajipur and Muzaffarpur: 211.25 gaj
- Bettiah (West Champaran): 363 gaj
Values for many other districts, such as Gaya, Bhagalpur or Darbhanga, are not confirmed in our data. If your land is there, ask the local amin or circle office.
How to convert katha to gaj
Gaj = katha × gaj in one local katha. Since a gaj is 9 sq ft, this is the same as katha × square feet ÷ 9.
Worked example: a 2.5 katha plot in Patna.
- One Patna katha is 1,361.25 sq ft ÷ 9 = 151.25 gaj.
- 2.5 × 151.25 = 378.125 gaj.
- The same 2.5 katha in Kolkata would be 2.5 × 80 = 200 gaj, less than half.
Gaj to katha
Plots in towns are often sold in gaj while old papers say katha. Divide by the local figure, or multiply by the inverse: 1 gaj is 0.0125 katha in West Bengal, 0.006612 in Patna, 0.005165 in Chhapra and 0.002755 in Bettiah.
| Gaj | Katha (West Bengal) | Katha (Patna) |
|---|---|---|
| 50 | 0.625 | 0.3306 |
| 100 | 1.25 | 0.6612 |
| 150 | 1.875 | 0.9917 |
| 200 | 2.5 | 1.3223 |
| 250 | 3.125 | 1.6529 |
| 300 | 3.75 | 1.9835 |
| 500 | 6.25 | 3.3058 |
Katha to gaj table by region
| Katha | Gaj West Bengal, Ranchi | Gaj Bihar (Patna, Arrah) | Gaj Assam (Brahmaputra valley) | Gaj Madhya Pradesh | Gaj Chhapra, Palamu |
|---|---|---|---|---|---|
| 1 | 80 | 151.25 | 320 | 66.6667 | 193.6 |
| 2 | 160 | 302.5 | 640 | 133.3333 | 387.2 |
| 3 | 240 | 453.75 | 960 | 200 | 580.8 |
| 4 | 320 | 605 | 1,280 | 266.6667 | 774.4 |
| 5 | 400 | 756.25 | 1,600 | 333.3333 | 968 |
| 6 | 480 | 907.5 | 1,920 | 400 | 1,161.6 |
| 8 | 640 | 1,210 | 2,560 | 533.3333 | 1,548.8 |
| 10 | 800 | 1,512.5 | 3,200 | 666.6667 | 1,936 |
| 15 | 1,200 | 2,268.75 | 4,800 | 1,000 | 2,904 |
| 20 | 1,600 | 3,025 | 6,400 | 1,333.33 | 3,872 |
| 25 | 2,000 | 3,781.25 | 8,000 | 1,666.67 | 4,840 |
| 40 | 3,200 | 6,050 | 12,800 | 2,666.67 | 7,744 |
| 50 | 4,000 | 7,562.5 | 16,000 | 3,333.33 | 9,680 |
| 100 | 8,000 | 15,125 | 32,000 | 6,666.67 | 19,360 |
Regional columns use the most commonly used size in each area. Confirm your local size with the revenue office.
A neat Kolkata shortcut
In West Bengal, 1 katha = 16 chatak and 1 chatak = 45 sq ft, which is exactly 5 gaj. So you can count chatak in fives: 4 chatak is 20 gaj, 8 chatak is 40 gaj, and a full katha of 16 chatak is 80 gaj.
A Patna coincidence
The Patna katha (1,361.25 sq ft) is the same size as the UP biswa. Both are one twentieth of the 27,225 sq ft pucca bigha. So 151.25 gaj answers both "1 katha in gaj in Patna" and "1 biswa in gaj in UP".
Tips
- Bihar and Jharkhand records mostly show acre and decimal. Convert katha to decimal too, and compare with the khatiyan.
- For a sale or partition, confirm the katha size with the amin, circle office or revenue office and check the land record.
Related: katha to square feet, bigha to katha and what is a katha.
Questions people ask
1 kattha in gaj in Bihar?
In Patna and Arrah, 1 kattha is commonly 151.25 gaj. In Chhapra it is 193.6 gaj, in Hajipur and Muzaffarpur 211.25 gaj, and in Bettiah 363 gaj.
100 gaj in katha?
100 gaj is 1.25 katha in West Bengal and 0.6612 katha in Patna.
200 gaj in katha?
200 gaj is 2.5 katha in West Bengal and 1.3223 katha in Patna.
Ek katha mein kitne gaj hote hain in Kolkata?
Kolkata mein 1 katha = 80 gaj (720 sq ft). Each of its 16 chatak is 5 gaj.
2 katha in gaj?
2 katha is 160 gaj in West Bengal and 302.5 gaj in Patna.
Local units can differ inside a state. Before a sale, partition or court filing, confirm the unit with your tehsil, circle or revenue office and check the land record. How we check our numbers.