Land Area Converter: Katha, Bigha, Decimal, Acre, Sq Ft

This is the general land area converter for Bangladesh and eastern India. Pick any unit on the left, any unit on the right, and type the amount. The result updates as you type, and the table under it shows the same land in all 28 units at once, so you can check a deed in decimal against a plot advertised in katha or a survey in square metres in one go.

28 units, one converter Everything is defined in square feet: 1 katha = 720, 1 decimal = 435.6, 1 gonda = 864, 1 acre = 43,560, 1 sq m = 10.764.

How to use it

1. Type the amount in the Amount box.
2. Choose the unit you have in the From list and the unit you want in the To list.
3. Read the result. The line under it gives the factor in both directions.
4. Press the swap button to reverse the conversion, or Copy result to paste it into a message.
5. Scroll the table for the same amount in every other unit.

The unit families

Survey units: acre, decimal, ojutangsho

These come from the Gunter's chain survey and are what the khatian records. 1 acre = 43,560 sq ft = 10 square chains = 100,000 square links. 1 decimal (satak, shotangsho) = 1/100 acre = 435.6 sq ft. 1 ojutangsho = 1/100 decimal = 4.356 sq ft.

Traditional units: bigha, katha, chotak

Used in deeds and daily dealing in Bangladesh and West Bengal. 1 bigha = 20 katha = 14,400 sq ft; 1 katha = 16 chotak = 720 sq ft; 1 chotak = 45 sq ft.

Chattogram and Sylhet units: kani, gonda, kora, kranti, til

1 kani = 20 gonda = 17,280 sq ft; 1 gonda = 4 kora = 864 sq ft; 1 kora = 3 kranti = 216 sq ft; 1 kranti = 20 til = 72 sq ft; 1 til = 3.6 sq ft. The gonda also splits into 12 kontho or 16 kak, and a kontho into 6 dondho, 42 dhul or 1,260 renu.

Metric and imperial

1 sq m = 10.764 sq ft; 1 are = 100 sq m; 1 hectare = 10,000 sq m = 2.471 acre. 1 sq yd = 1 gaj = 9 sq ft; 1 sq hat = 2.25 sq ft (a hat is 18 inches); 1 sq link = 0.4356 sq ft; 1 sq chain = 4,356 sq ft.

Every unit in square feet

Unit	Square feet	Unit	Square feet
Square inch	0.00694	Chotak	45
Renu	0.0571	Kak	54
Square link	0.4356	Kranti / kontho	72
Square foot	1	Kora	216
Dhul	1.714	Decimal / satak / shotangsho	435.6
Square hat	2.25	Katha	720
Til	3.6	Gonda	864
Ojutangsho	4.356	Are	1,076.39
Square yard / gaj	9	Square chain	4,356
Square metre	10.764	Bigha	14,400
Dondho	12	Kani	17,280
Acre	43,560	Hectare	107,639.1

These are the standard sizes for Bangladesh and West Bengal. Bigha, katha and biswa are different in Bihar, Uttar Pradesh, Gujarat, Rajasthan and Nepal; the bigha to acre converter has a region picker for those.

Common conversions

• Katha to square feet: 1 katha = 720 sq ft
• Bigha to square feet: 1 bigha = 14,400 sq ft
• Decimal to square feet: 1 decimal = 435.6 sq ft
• Katha to decimal: 1 katha = 1.653 decimal
• Gonda to square feet: 1 gonda = 864 sq ft
• Gaj to square feet: 1 gaj = 9 sq ft
• All formulas on one page

Frequently asked questions

Which unit should I trust, the deed or the advertisement?

The deed and the khatian, which are in acres and decimal. Convert the advertised katha to decimal and compare; a 5 katha plot should read about 8.26 decimal.

Why does the converter show 28 units when I only need two?

The table under the result lets you check the same land in every unit without changing the selection. Use the two lists for the pair you need and ignore the rest.

Are the results rounded?

The arithmetic is exact; only the display is rounded, to four decimal places for values above 1 and six below it.

Do the figures apply outside Bangladesh?

West Bengal and Assam use the same sizes. Bihar, Uttar Pradesh, Gujarat, Rajasthan and Nepal have their own bigha and katha, covered by the region pages linked above.