180chain是多少m？
180chain = 3,621.024m
是3,621.024m，所以说成3,621m也没问题——四舍五入的误差在0.5%以内。
反过来，180m是多少chain？
180m = 8.9477chain
计算公式: m = chain × 20.1168
该数值前后的 chain → m
90 chain1,810.512m
100 chain2,011.68m
110 chain2,212.848m
120 chain2,414.016m
130 chain2,615.184m
140 chain2,816.352m
150 chain3,017.52m
160 chain3,218.688m
170 chain3,419.856m
180 chain3,621.024m
190 chain3,822.192m
200 chain4,023.36m
210 chain4,224.528m
220 chain4,425.696m
230 chain4,626.864m
240 chain4,828.032m
250 chain5,029.2m
260 chain5,230.368m
270 chain5,431.536m
280 chain5,632.704m