Convert Tsubo to Square Millimeter

One tsubo equals 3,305,785.124 mm². This converter allows you to easily convert between Tsubo and Square Millimeter in real time.

Formula

tsubo × 3,305,785.124 = mm²

Example: 1 tsubo = 3,305,785.124 mm²

What is Tsubo?

The tsubo is a traditional Japanese unit of area equal to exactly 400/121 square meters (approximately 3.306 m²). It originates from the ken-based measurement system, where one tsubo equals one square ken (about 1.818 m × 1.818 m), or the area of two standard tatami mats. In Japanese real estate, land prices are often quoted per tsubo, and property sizes are commonly described in tsubo alongside square meters. Despite Japan's adoption of the metric system, the tsubo remains deeply embedded in the culture of land and housing transactions.

What is Square Millimeter?

The square millimeter is a unit of area equal to a square with sides of one millimeter, or one-millionth of a square meter. It is most commonly used in electrical engineering to specify the cross-sectional area of wire conductors (for example, "a 2.5 mm² cable"). Precision-machined parts, O-ring cross-sections, and microelectronic chip features are also measured in square millimeters. In printing, the fine details of typefaces may be analyzed at this scale.