The NPER function calculates the number of periods for an investment and takes 3 required arguments and 2 optional requirements:

NPER takes 3 required arguments and 2 optional arguments:

Syntax: NPER(rate, pmt, pv, [fv], [type])

#1)
Using the NPER function with only the required arguments:
#2)
Using the NPER function with the optional arguments:
#3)
The arguments for the NPER function are:
Argument Required? Description
rate Required The interest rate per period.
pmt Required The payment made each period; it cannot change over the life of the annuity. Typically, pmt contains principal and interest but no other fees or taxes. If pmt is omitted, you must include the pv argument.
pv Required The present value, or the lump-sum amount that a series of future payments is worth right now.
fv Optional The future value, or a cash balance you want to attain after the last payment is made. If fv is omitted, it is assumed to be 0 (the future value of a loan, for example, is 0).
type Optional The number 0 or 1 and indicates when payments are due. If type is omitted, it is assumed to be 0:
Possible type argument values:
#4)
A few more things:
Make sure that you are consistent about the units you use for specifying rate and nper. If you make monthly payments on a 5-year loan at 10 percent annual interest, use 10%/12 for rate and 5*12 for nper. If you make annual payments on the same loan, use 10% for rate and 5 for nper.
For all the arguments, cash you pay out, such as deposits to savings, is represented by negative numbers; cash you receive, such as dividend checks, is represented by positive numbers.

Summary

The NPER function calculates the number of periods for an investment.
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