Convert traditional Japanese units of area, length, weight and volume to metric and imperial units.
Tsubo, tatami (jō) and square meters / feet — the area units on Japanese floor plans and land listings.
Shaku, sun, ken and ri — the length units of the old Japanese system, still used in kimono, carpentry and history.
Monme (momme) and kan — weight units you still meet in pearls, produce and sumo.
Shō and gō — the rice-and-sake volume units (a one-shō bottle, a rice cup).
One tsubo (坪) is defined by Japan’s Measurement Act as exactly 400/121 m², which is about 3.30579 m² (roughly 35.5832 sq ft). It is the size of two tatami mats and is the everyday unit for land and floor area in Japan.
For real-estate listings the standard figure is 1 jō = 1.62 m² (the minimum in Japan’s Fair Competition Code), so a 6-jō room is about 9.72 m². Actual mats vary by region — Kyōma ≈ 1.82 m², Edoma ≈ 1.55 m².
The traditional units use their legal definitions (1 shaku = 10/33 m, 1 tsubo = 400/121 m², 1 shō = 2401/1331 L, and so on). Yard-pound and US-customary targets use exact definitions (1 inch = 0.0254 m, 1 sq ft = 0.09290304 m², 1 lb = 453.59237 g). Displayed values are rounded to 6 significant figures.
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