30chain是多少m？
30chain = 603.504m
是603.504m，所以说成604m也没问题——四舍五入的误差在0.5%以内。
反过来，30m是多少chain？
30m = 1.4913chain
计算公式: m = chain × 20.1168
该数值前后的 chain → m
12 chain241.4016m
14 chain281.6352m
16 chain321.8688m
18 chain362.1024m
20 chain402.336m
22 chain442.5696m
24 chain482.8032m
26 chain523.0368m
28 chain563.2704m
30 chain603.504m
32 chain643.7376m
34 chain683.9712m
36 chain724.2048m
38 chain764.4384m
40 chain804.672m
42 chain844.9056m
44 chain885.1392m
46 chain925.3728m
48 chain965.6064m
50 chain1,005.84m