Mu number calculation formula

The traditional formula for calculating the number of mu of land is: 1 mu =60 square abbot = 6,000 square feet =666.667 square meters.

The formula is: length (m) × width (m) ×0.00 15= mu number. For example, the land area of 200m long and 150m wide is 200 (m) ×150 (m) × 0.0015. In some important documents in the pre-Qin period, "mu" is often the title of "private field"; "Tian" is often the title of "public field". According to the unearthed Shang Yang Fang Sheng, "one mu" is about 0.2907 mu, and 100 mu is equivalent to 29.07 mu. There is also a more practical formula in the folk to calculate: square meters are converted into acres, and the calculation formula is "add half to the left and move three". 1 m2 = 0.0015mu, for example, how many mu is128m2? The calculation method is 128 plus half of 128: 128+64 = 192, and then move the decimal point three places to the left, that is, the mu number is 0. 192. Mu is square meters, and the calculation formula is "divide by three, move right by three". The "mu" in Xia and Shang Dynasties may be the name of a piece of land cultivated by a farmer, such as 50 mu in Xia Dynasty and 70 mu in Shang Dynasty. However, the Xia-Shang minefield model is different from the Zhou minefield model in structure. Mencius classified the cultivated land area of Zhouminefield into the model of commercial minefield, which made his explanation difficult to justify. Many discussions about the mine field system in history have not solved this problem, so that the contradiction can not be solved. It can be seen that solving the ore field model between Xia, Shang and Zhou is actually the key to further explore the ore field system.