This is calculator to calculate the net present value.
The formula for determining the present value of a perpetuity is as follows:
NPV = -Investment +ΣCF_lastyear / (1+Discount rate) ^lastyear +TV / (1+Discount rate) ^lastyear
TV=CF_lastyear (1 + Growth rate) / (Discount rate - Growth rate)
CF_lastyear=Cash flow of the last year of projection period
Guess IRR(%) is a number that you guess is close to the result of IRR.