Area Unit Converter (tsubo, tatami, m2, acre)

Converts an area into square centimetres, square metres, ares, hectares, square kilometres, tsubo, tatami, square feet and acres. One tsubo is 400/121 m² and one tatami is taken as 1.62 m², the Japanese advertising minimum.

Explanation

Enter an area and choose its unit, and every other unit follows, including the Japanese tsubo and tatami used throughout the property market.

The definitions

1 tsubo = $\dfrac{400}{121}$ ≒ 3.3058 m², the square of one ken (20/11 m)
1 tatami = 1.62 m², the minimum size allowed in Japanese property advertising
1 are = 100 m², 1 hectare = 10000 m²
1 acre = 4046.8564224 m², roughly 4047 m²

Example

Convert 100 m².

100 \times \dfrac{121}{400} = 30.25\ \text{tsubo}

That is 61.73 tatami, or 1076.4 square feet.

Watch out

One tsubo is not two tatami. A tsubo is 3.3058 m², while two advertising tatami come to only 3.24 m². Historically a tsubo was two mats, but the 1.62 m² figure is a legal minimum rather than a true mat size, so the two no longer line up exactly.

Real tatami vary a great deal by region: about 1.82 m² in Kyoto, 1.66 m² in Nagoya, 1.55 m² in Tokyo and 1.45 m² in public housing. Two rooms both advertised as "six mats" can differ noticeably in size, so it is safest to compare them in square metres.