Se to Hectares (se to ha)

1 se equals 0.009917355372 hectares (rounded).

1 se = 0.009917355372 hectares

How to convert se to hectares

To convert se to hectares, multiply the number of se by 0.009917355372. The factor is rounded to 10 significant digits. To go the other way, multiply hectares by 100.8333333 (rounded).

hectares = se × 0.009917355372

Example: 10 se = 0.09917355372 hectares.

About these units

Se (se)

JapaneseTraditional unit (still used in some regions)

30 tsubo, about 99.17 m².

Between the humble tsubo and the field-sized tan sits the se, a plot of 30 tsubo. In square metres that is exactly 12,000/121, or about 99.17, which is just under one are, the metric land unit of 100 square metres. A se measures roughly ten metres by ten, a small garden or a slice of a paddy.

The scale is decimal above this point. Ten se make one tan, and a hundred se make one cho, so the se works as the first step in the farmland ladder rather than a unit with a life of its own. Property listings today seldom use it, and it is mostly met in old land records and in conversion tables.

Its exact size comes from the Meiji legal definition. The 1891 law set the shaku at 10/33 metre, and the tsubo as the square of six shaku, so every larger land unit built on the tsubo inherited a fixed metric value. Before that, the shaku itself varied by era and use.

1 se = 99.17355372 square meters (approximately).

Sources: Wikipedia: Japanese units of measurement; Wikipedia: Shaku (unit); Wikipedia: Tsubo

Hectare (ha)

Metric (SI)Current unit

10,000 square meters (2.471 acres). The standard unit for land and agricultural areas outside the US.

Hecto plus are: the name was coined in French, and are itself comes from the Latin area, meaning an open space. The French law of 18 Germinal, Year III (7 April 1795) defined the are as 100 square meters, and the hectare followed as 100 ares, or 10,000 square meters. The unit is therefore a product of the original French metric reforms rather than of later SI work, which is one reason its official status has always been slightly awkward.

When the SI was set up in 1960 the are was not recognized, and the hectare was classed as a non-SI unit accepted for use with it. In practice it is the standard unit for land ownership, planning and agriculture in the European Union, the United Kingdom, Canada, Australia, New Zealand and South Africa, while the United States and Myanmar stay with the acre. A hectare is a square 100 meters on each side, about the size of Trafalgar Square, and equals roughly 2.47 acres. One hundred of them make a square kilometer.

1 hectare = 10,000 square meters (exactly).

Sources: Wikipedia: Hectare; Wikipedia: Are (unit); NIST Guide to the SI, Appendix B.8: conversion factors

Related conversions

See all area units.