Online Calculator - NPer Function

NPer returns the number of periods for an annuity

Description of the function NPer

Returns a value specifying the number of periods for an annuity based on periodic fixed payments and a fixed interest rate.

An annuity is a series of fixed cash payments made over a period of time. An annuity can be a loan (such as a home mortgage) or an investment (such as a monthly savings plan).

For all arguments, cash paid out (such as deposits to savings) is represented by negative numbers; cash received (such as dividend checks) is represented by positive numbers.

Calculate the number of periods online

Interest rate
Payment of period
Present value
Future value

Decimal places


Number of periods

Description of the parameters


The interest rate per period. For example, if you get a car loan at an annual percentage rate (APR) of 10 percent and make monthly payments, the rate per period is 0.1/12, or 0.0083.


The payment to be made each period. Payments usually contain principal and interest that does not change over the life of the annuity.


The present value, or value today, of a series of future payments or receipts. For example, when you borrow money to buy a car, the loan amount is the present value to the lender of the monthly car payments you will make.


The future value or cash balance you want after you have made the final payment. For example, the future value of a loan is $0 because that is its value after the final payment. However, if you want to save $50,000 over 18 years for your child's education, then $50,000 is the future value. The default is 0.


Due date specifies when payments are due. This argument must be either End of Period if payments are due at the end of the payment period, or Begin of Period if payments are due at the beginning of the period.

RedCrab Calculator

With the "RedCrab Calculator" use the "NPer" function for the calculation of the number of periods.