Ping, an area unit derived from the traditional Japanese measurement system, is mainly used to calculate the area of houses and construction land. Mainly used in Japan, China, Taiwan Province and Korean Peninsula.

1 ping is equal to one thirtieth of 1 mu per day, or 3.3057 square meters. 1 ping is 6-day feet ×6-day feet, that is, the area of two tatami, and 1 day feet is about 30.3 cm.

Common unit of area

Common units of area are square kilometers, square meters, square decimeters, square centimeters and square millimeters.

1, a square with a side length of 1 mm, and an area of 1 mm2.

2. A square with a side length of 1 cm and an area of 1 cm2.

3. A square with a side length of 1 decimeter and an area of 1 square decimeter.

4. A square with a side length of 1 m and an area of 1 m2.

5. A square with a side length of 1 km and an area of 1 km2.