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It is the compound interest payable annually in arrears, based on the nominal interest rate. It is used to compare the interest rates between loans with different compounding periods. In a situation where a 10% interest rate is compounded annually, its effective interest rate would also be 10%. [1]
n is the compounding frequency (1: annually, 12: monthly, 52: weekly, 365: daily) [10] t is the overall length of time the interest is applied (expressed using the same time units as n, usually years). The total compound interest generated is the final amount minus the initial principal, since the final amount is equal to principal plus ...
The effective interest rate is always calculated as if compounded annually. The effective rate is calculated in the following way, where r is the effective rate, i the nominal rate (as a decimal, e.g. 12% = 0.12), and n the number of compounding periods per year (for example, 12 for monthly compounding):
The basic compound interest formula for deposit accounts is: A ... the number of compounding periods would be 12. And the time to calculate the amount for one year is 1. ... With an annual ...
By using this formula, you can determine the total value your series of regular investments will reach in the future, considering the power of compound interest. Using the example above: FV ...
is the annual effective interest rate, which is the "true" rate of interest over a year.Thus if the annual interest rate is 12% then =. (pronounced "i upper m") is the nominal interest rate convertible times a year, and is numerically equal to times the effective rate of interest over one th of a year.
For continuous compounding, 69 gives accurate results for any rate, since ln(2) is about 69.3%; see derivation below. Since daily compounding is close enough to continuous compounding, for most purposes 69, 69.3 or 70 are better than 72 for daily compounding. For lower annual rates than those above, 69.3 would also be more accurate than 72. [3]
This is a reasonable approximation if the compounding is daily. Also, a nominal interest rate and its corresponding APY are very nearly equal when they are small. For example (fixing some large N), a nominal interest rate of 100% would have an APY of approximately 171%, whereas 5% corresponds to 5.12%, and 1% corresponds to 1.005%.