FACTS: A "jo" is a Japanese unit of area measurement used in real estate. The size of a jo (corresponding to the size of a tatami mat) varies by region in Japan. Recently, tatami seems to be shrinking -- older places have larger 6-jo rooms than newer ones.

This conversion table calculator is calibrated using a tatami mat size of 85.5cm wide and 179cm in length (about 33.5 by 70.5 inches).

The standard room size is 6-jo, and 4.5-jo for smaller ones. Newer places with hardwood floors come in a wider range of sizes, with 14-jo being a good-sized living/dining room.

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TEiJ

Japan Zone

Japanese Jo	Square Meters
1.00	1.53
1.50	2.30
2.00	3.06
2.50	3.83
3.00	4.59
3.50	5.36
4.00	6.12
4.50	6.89
5.00	7.65
5.50	8.42
6.00	9.18
6.50	9.95
7.00	10.71
7.50	11.48
8.00	12.24
8.50	13.01
9.00	13.77
9.50	14.54
10.00	15.30
10.50	16.07
11.00	16.83
11.50	17.60
12.00	18.37
12.50	19.13
13.00	19.90
13.50	20.66
14.00	21.43
14.50	22.19
15.00	22.96
15.50	23.72
16.00	24.49

Feel free to copy these metric conversion numbers but please include the following:

<a href="http://www.teaching-english-in-japan.net/conversion/">Convert measurements</a>

Japanese Jo to Square Meters Conversion Calculators

Metric Conversion Tables (Japanese Tatami: Jo Tatami Mats to Square Meters)

Metric Conversion Tables (Japanese Tatami:
Jo Tatami Mats to Square Meters)