*1 '''Tan''' (反・段) = 991.7m<sup>2</sup><ref name=hideyoshi>Prior to [[Toyotomi Hideyoshi]] decreeing a new standard in [[1598]], one ''tan'' was equal to 360 ''bu'' instead of 300 ''bu'', and was therefore roughly equal to 1,190.4m<sup>2</sup> instead of 991.7m<sup>2</sup>. One ''chô'' was still ten ''tan'', making ''chô'' at that time equal to roughly 11.904km<sup>2</sup>.</ref>
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*1 '''Tan''' (反・段) = 991.7m<sup>2</sup><ref name=hideyoshi>Prior to [[Toyotomi Hideyoshi]] decreeing a new standard in [[1598]], one ''tan'' was equal to 360 ''bu'' instead of 300 ''bu'', and was therefore roughly equal to 1,190.4m<sup>2</sup> instead of 991.7m<sup>2</sup>. One ''chô'' was still ten ''tan'', making ''chô'' at that time equal to roughly 11.904km<sup>2</sup>. In theory, a ''tan'' of land produced one ''koku'' of rice, and a ''chô'' of land produced ten ''koku'' of rice.</ref>