Tann
The tan is a traditional Japanese unit of land area widely used to measure agricultural plots and fields. Defined as 300 tsubo or 10 se, one tan is equal to approximately 991.74 square metres. Codified under the Weights and Measures Law of 1891 in the shaku-kan system, it historically represented the field area needed to produce a year's supply of rice for one person, prior to Japan's full metrication adoption in 1959.
Metric
- Square kilometre (km²)9.92×10⁻¹⁰
- Hectare (ha)9.92×10⁻⁸
- Are (a)9.92×10⁻⁶
- Square metre (m²)9.92×10⁻⁴
- Square decimetre (dm²)0.1
- Square centimetre (cm²)9.92
- Square millimetre (mm²)991.74
- Square micrometre (µm²)991,735,865.04
- Square nanometre (nm²)9.92×10¹⁴
British/American
- Township1.06×10⁻¹¹
- Square mile3.83×10⁻¹⁰
- Homestead1.53×10⁻⁹
- Acre2.45×10⁻⁷
- Rood9.8×10⁻⁷
- Square rod3.92×10⁻⁵
- Square1.07×10⁻⁴
- Square yard (yr²)1.19×10⁻³
- Square foot (ft²)0.01
- Square inch (in²)1.54
Other
- Metric dunam9.92×10⁻⁷
- Cypriot dunam7.41×10⁻⁷
- Iraqi dunam3.97×10⁻⁷
- Football pitch1.39×10⁻⁷
Brazilian
- Alqueire paulista4.1×10⁻⁸
- Alqueire mineiro2.05×10⁻⁸
- Alqueire baiano1.02×10⁻⁸
- Alqueire do norte3.65×10⁻⁸