: Annual interest rate from different monthly interest rates Let's says I have unequal monthly interest rates (1,5% in the first month, 1,7% in the second, -0,8% in the third...) is there a way I can calculate what was my interest

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You can use the geometric mean, e.g.

Check

quarterly return = (1 + 0.015)*(1 + 0.017)*(1 - 0.008) - 1 = 2.3997 %

Using the geometric mean

gm = 1.007935842

quarterly return = gm^3 - 1 = 2.3997 %

So the average monthly return is gm - 1 = 0.7935842 %

The effective annual interest rate would be gm^12 - 1 = 9.94986 % and the nominal annual rate compounded monthly would be (gm - 1)*12 = 9.52301 %.