Mu is the unit of land area in China. One acre is equal to 60 square meters, which is equivalent to about 666.67 square meters when converted into modern metric system.

The calculation method is as follows:

Because 1 mu =60 square abbot =6000 square feet;

And 1 m =3 feet; 1 m2 =9 square feet;

So 1 mu =6000÷9≈666.67 square meters.

Therefore, the conversion of one acre into modern public constraint is equal to 666.67 square meters.

Extended data:

Gumu algorithm

Well-field system, a hundred steps into an acre. In Qin Dynasty, Shang Yang reformed and abandoned the ore field, taking 240 steps as an acre. Emperor Wu of the Han Dynasty unified the number of steps per mu, and all steps were 240 mu, which was implemented nationwide. Since then, the width of an acre has been 240 steps, and it has not changed until the end of the Qing Dynasty. Qin and Han dynasties took six feet as steps, and one foot was about 23 cm long. Sui and Tang dynasties took five feet as steps, and one foot was about 30 centimeters long. In contrast, the human stride has hardly changed. One step (one left and one right) is basically 1.4~ 1.5 meters. According to the median value1.45m, one acre is about 500 square meters.

References:

Baidu Encyclopedia-Mu