# Immediate / Ordinary Annuity Interest Rate Calculator

Posted by Dinesh onThis calculator calculates the **immediate annuity** using sum to invest, time period, annual rate of return, frequency of payment values.

## Immediate / Ordinary Annuity Interest Rate Calculation

### Formula:

Immediate Annuity = pi / ( 1 - ( 1 + i )^-n )

p = Sum to invest,

n = Time period(in years),

i = Annual rate of return.