area · China / East Asia · Historical–modern

tsubo

exact

Record: M238
Definition quality: Standardized historical Japanese shakkan reference
Conversion mode: multiplicative
Calculator: Fully calculable

Definition

Former Japanese law defines bu/tsubo as 400/121 square metres; NDL gives approx. 3.31 m².

Reference value

One tsubo is equal to 3.30579 square metres.

Modern use

Modern-use scope is context-dependent; the website should follow the record's current-status and regional/system labels rather than imply universal use.

Did you know?

Tsubo remains culturally recognizable in Japanese property/floor-area contexts.

Sources & evidence

Source tier Tier B/C — recorded secondary/reference source · confidence High

Related measurements

hectare

area · International · Modern

Non-SI unit accepted for use with the SI; 1 ha = 10⁴ m².

square metre

m²

area · International · Modern

Coherent SI derived unit for area, equal to metre squared.

acre

area · UK / US · Modern / historical

1 acre = 43,560 ft² = exactly 4046.8564224 m² using the international foot.

square foot

ft²

area · UK / US · Modern / historical

1 ft² = exactly 0.09290304 m².

square yard

yd²

area · UK / US · Modern / historical

1 yd² = exactly 0.83612736 m².

square mile

mi²

area · UK / US · Modern / historical

1 mi² = exactly 2,589,988.110336 m².

square kilometre

km²

area · International · Modern

1 km² = exactly 10^6 m².

square inch

in²

area · US / UK · Modern

1 in² = exactly 0.00064516 m².