Geography decided the units
Nepal's land measurement splits cleanly along its landscape. In the hilly regions — the Kathmandu Valley, Pokhara, and the mid-hills where terraced plots are small — land is measured in the ropani system. In the flat, agricultural Terai plains bordering India, land is measured in the bigha system, closely related to the bigha of neighboring Bihar and UP but with its own (much larger) size. The two systems share no units and no common heritage beyond both being pre-metric; converting between them always goes through square feet or square meters.
The hill system: ropani, aana, paisa, daam
One ropani is exactly 5,476 sq ft — a 74 ft × 74 ft square — and divides by fours: 16 aana per ropani,4 paisa per aana, 4 daam per paisa. Areas are written as four numbers in that order, so a lalpurja reading 1-8-2-0 means 1 ropani, 8 aana, 2 paisa: (1 × 5,476) + (8 × 342.25) + (2 × 85.5625) = 8,385.1 sq ft.
The base-four design made inheritance division easy, and generations of it are why Kathmandu's plots are so small: the typical valley house plot today is 4 aana (1,369 sq ft), and prices are quoted per aana. Anything above a ropani in the city core is a large holding.
The Terai system: bigha, kattha, dhur
One Terai bigha is 72,900 sq ft (about 1.67 acres) — more than five times the Bengal bigha across the border. It divides into 20 kattha of 3,645 sq ft, each of20 dhur (182.25 sq ft). Terai records are written as three numbers: 0-5-10means 5 kattha 10 dhur, i.e. 20,047.5 sq ft. Agricultural land trades per bigha or kattha; town plots in Birgunj, Biratnagar, or Butwal trade per kattha or perdhur.
Cross-border families should note the trap: a "bigha" in a Nepali Terai record and a "bigha" in a Bihar record differ by a factor of about 2.7, and the two katthas differ similarly. Always convert with the figure that matches the country of the document.
The metric layer and key bridges
Nepal's survey department works in metric, and newer lalpurjas show square meters alongside the traditional figure. The bridges worth memorizing: 1 ropani = 508.74 m², 1 aana = 31.80 m², 1 Terai bigha = 6,772.6 m² (0.677 hectare), 1 kattha = 338.63 m². Between the two traditional systems:1 bigha ≈ 13.31 ropani, and 1 ropani ≈ 1.5 kattha. One hectare is about 19.66 ropani or 1.48 bigha — seehectare to bighafor full tables.
Practical tips for Nepali land paperwork
- Read the format first: four numbers = ropani system, three numbers = bigha system.
- Enter combined figures directly into our converter — it accepts ropani-aana-paisa-daam and bigha-kattha-dhur as written on the certificate.
- Compare per-aana and per-kattha prices in square feet: NPR 50 lakh per aana is about NPR 14,600/sq ft; NPR 50 lakh per kattha is about NPR 1,372/sq ft.
- For subdivision or sale, the Malpot office's metric survey figure is authoritative; traditional figures on older certificates are rounded to the nearest daam or dhur.