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Future value of annuity - solve for n
 

 

 

The formula for solving for number of periods (n) on an annuity shown above is used to calculate the number of periods based on the future value, rate, and periodic cash flows.

The formula at the top of the page, solving for n, generally approaches the question "How long will it take to save $x amount dollars by saving $y per month at a rate of z%".

Reference: financeformulas.net