Tsubo / m² / Tatami Converter

How to use

Enter a value in any field — tsubo, square metres (or sq ft), or tatami mats — and the others update automatically. Pick the tatami standard that matches the region when a listing specifies Kyōma, Chūkyō, or Edoma.

Land is often quoted in tsubo while rooms are quoted in tatami. Converting both to m² makes Japanese listings easier to compare.

Quick reference

• 1 tsubo = 3.305785 m² (exactly 400/121)
• 25 tsubo ≈ 82.6 m² — a mid-size apartment footprint
• 6 tatami (Edoma) ≈ 9.3 m²

Tatami area varies by region. This tool cannot tell whether a listing uses wall-centre or usable floor area — measure on site for furniture or renovation work.