What is 1 Heibei? Understanding Japanese Area Units: Square Meters, Tsubo, and Jo
How large is “1 Heibei”? In this article, we will explain the size of 1 Heibei with reference photos and show you how to convert it into other Japanese units like “Tsubo” and “Jo”.
When staying at a hotel or looking for an apartment in Japan, you will often see the term “Heibei” (平米). This is simply the Japanese word for Square Meter, and its unit symbol is ㎡.
In addition to Heibei, Japan has its own unique units of measurement: “Tsubo” (坪) and “Jo” (帖/畳). While modern listings mostly use Heibei (㎡), Tsubo and Jo are still frequently used in the real estate industry.
“Tatami” (畳) are the traditional straw mats used as flooring in Japanese rooms, often seen in countryside houses in Japanese anime. When used as a unit of area, it is written as “Jo” (帖). While the character for Tatami can also be read as “Tatami,” as a unit of measurement, it is pronounced “Jo”.
The white frame in the photo above represents 1 Heibei, which is exactly 1 meter by 1 meter (approx. 10.76 square feet).
Below, we explain the conversion of 1 Heibei into other units with photos to help you visualize the space. We have also compiled lists of photos for other sizes, as well as guides for “Jo” and “Tsubo”.
Conversion of 1 Heibei to Tsubo and Jo (Tatami)
To help you visualize the size of 1 Heibei, the following table shows the dimensions of a square of this size, and its equivalent in “Tsubo” and “Jo”, which are commonly used to describe room sizes in Japan.
| Square Meter (Heibei) | Jo (Tatami mat) | Tsubo | Dimensions (W x L) | Room Layout Guide |
|---|---|---|---|---|
| 1 Heibei (1㎡) | 0.62 Jo | 0.303 Tsubo | 1m × 1m | N/A (Too small) |
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Note: The size of one “Jo” can vary slightly depending on the region of Japan. To avoid confusion, the official real estate standard now defines 1 Jo as 1.62㎡.
Photo of 1 Heibei
The white frame is 1m x 1m, representing 1 Heibei. To give you a better sense of the area, we placed a standard-sized open newspaper in the center. Photograph taken at “Sekizenkan” in July 2019.
In addition to Heibei, Jo, and Tsubo, we have summarized information about the different sizes of tatami mats used in various regions (Kyoma, Chukyo-ma, Edoma, Danchi-ma, etc.). Please check them out if you are interested!
