Our Perpetuity Calculator is developed with only one goal, to help people avoid hiring accountants. First, perpetuity is a type of payment which is both relentless and infinite, such as taxes. With the help of this program, you can easily calculate payment, present value, and interest rate. Each of them is connected. In order to fully understand how the perpetuity online calculator works, you need to understand three main definitions. Present value is the amount of money that you owe, which is calculated by dividing the payment over an interest rate. Payment is the amount of money you have to give up, which in most cases is tax and calculated by multiplying present value to an interest value. Finally, an interest rate is a percentage payment value of the present value.