The first step to calculate the NPV using Excel is to input all the cash flows of the investment project. First is to use the basic formula calculate the present value of each. To calculate NPV you need to know the annual discount.
In the example shown the formula in F6 is.
This is not rocket science. For example if you use annual cash flows the discount rate must be annual. NPV Calculation Net present value NPV measures the net increase in a companys value resulting from an investment. Take into account that the discount rate period must correspond to the cash flows period.