就像标题一样，我在找公式，把年利率换算成月利率，当我也知道复利频率
eg年利率是8%，每天复利，我赚的月利率是多少。
或者同样是每半年复利一次。
可能最简单的是先换算成实际年利率：
link:- 实际年利率-计算
所以，计算8%的日复利作为月利率，m。
i = 0.08
n = 365
r = (1 + i/n)^n - 1 = 0.0832776 = 8.32776 % effective annual interest
m = ((r + 1)^(1/12)) - 1 = 0.0066882 = 0.66882 % monthly interest
equivalent to APR compounded monthly = 12 * m = 8.02584 %
而按6个月计算8%的复利作为月利率，m:
i = 0.08
n = 2
r = (1 + i/n)^n - 1 = 0.0816 = 8.16 % effective annual interest
m = ((r + 1)^(1/12)) - 1 = 0.0065582 = 0.65582 % monthly interest
equivalent to APR compounded monthly = 12 * m = 7.86984 %
一步到位：
m = ((1 + i/n)^n)^(1/12) - 1
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