Land Area Converter

How to use it

Choose the country or region, type the area and choose its unit. The unit list holds that country's units and the international ones, and the table below gives the area in all of them, with the country's units first. A local unit leads with square feet for India, Bangladesh and Nepal and square metres elsewhere; an international one leads with the country's main unit, so 1,000 m² entered under China reads 1.5 mu. A line under the result gives the definition of a local unit, such as 1 guntha = 1/40 ac = 1,089 ft².

• State — for India, choosing West Bengal adds its bigha, katha and chhatak, and the area converts into katha. All states lists only the gaj, cent and guntha, which are the same everywhere.
• Nepal — the hill units (ropani, aana, paisa, daam) and the Terai units (bigha, kattha, dhur, kanwa) are listed together, under their own headings.
• Rai-ngan-wah — under Thailand, choose Rai-ngan-wah (title deed) and type the area as a deed writes it, such as 2-1-50. Ngan of 4 or more and wah of 100 or more carry over, and the tool says so. Any other Thai entry is also shown in this form, with the wah to 2 decimal places.
• Jō — under Japan, the jō is the figure housing adverts use, 1.62 m² or more of floor per jō, and the result notes it.

The address bar keeps your entries, so a copied link opens the same conversion. Everything runs in your browser.

How the units are defined

Each local unit is a fixed fraction of an acre, a fixed number of square feet or square metres, or a fraction of another local unit. The cent and the decimal are a hundredth of an acre, the guntha a fortieth, and Sri Lanka's perch and rood a 160th and a quarter. Thailand's rai is 4 ngan, and a ngan 100 square wah of 4 m² each. The pyeong and the tsubo are the same size, 3.305785124 m², and the mu is a fifteenth of a hectare.

West Bengal's bigha is 14,400 ft², split into 20 katha of 720 ft² and each katha into 16 chhatak of 45 ft². Nepal measures its units from squares: a ropani is 74 feet square, 5,476 ft², and a Terai bigha 270 feet square, 72,900 ft². Nepal's bigha is about 5 times the size of West Bengal's, which is why a bigha means nothing without its place.

Examples

Land units by country

Sources

The acre is 4,840 square yards, and the yard exactly 0.9144 m, which makes an acre 4,046.856422 m² (NIST Handbook 44).

West Bengal's bigha, katha and chhatak are the figures its Directorate of Registration and Stamp Revenue publishes for registering documents.

Nepal's units follow the Law Commission of Nepal's note on writing land areas, taken from Prakash Basti's history of Nepalese law. It prints the aana and paisa rounded (342 and 85½ ft²); the tool keeps the exact fractions of a ropani, so 16 aana always make one.

Egypt's Law 229 of 1951 sets the feddan at 4,200.833 m², a rounded figure, and prints the qirat and sahm rounded as well (175.035 m² and 7.293 m²). The tool keeps the qirat at exactly a 24th of a feddan and the sahm a 24th of a qirat, so 24 qirat always make one feddan.

Japan's Real Estate Fair Trade Council requires a jō in a housing advert to mean at least 1.62 m² of floor (rules, art. 10 (16)).

Bihar's revenue glossary and Hanumangarh's district gazetteer record how the kattha and bigha vary within a single state, the reason other states are not listed.

Sources

• Handbook 44, Appendix C: General Tables of Units of Measurement — NIST
• Frequently asked questions, Q. 17 — Directorate of Registration and Stamp Revenue, West Bengal
• जग्गाको क्षेत्रफल लेख्ने पुरानो तरिका (The old way of writing land area) — Law Commission of Nepal
• Law 229 of 1951 on weights and measures, Table 1 — Manshurat
• 不動産の表示に関する公正競争規約施行規則 (Real estate display rules) — Real Estate Fair Trade Council
• Bihar Revenue Glossary — Department of Revenue and Land Reforms, Bihar
• District Gazetteer: Hanumangarh, chapter 10 — Government of Rajasthan

Reviewed 3 October 2026

Frequently asked questions

See also

• Area Converter — for square millimetres to square miles, with formulas and precision options.