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Net Present Value is one of the core evaluation methods utilized in corporate finance for capital budgeting. It is a robust method to determine whether a project will exceed a rate of return and add value to a firm. In general, NPV yields a single cash value in terms of "today's" dollars from a stream of cash flows that will occur in the future. AN NPV of $0 indicates that the stream of cash flows is earning exactly the cost of capital, while postive NPV indicates earning in excess of the cost of capital. It may go without saying that that negative NPV streams should be avoided. All things equal, a higher NPV project is "better" than a lower one.
Internal Rate of Return is another method of evaluating cash flows, however it is not as robust as NPV. IRR can be defined as the cost of capital that will cause the NPV of a stream of cash flows to be $0. This seems to suggest that a higher IRR is to be desired. However, IRR is only reliable in cases where a net negative outflow occurs in the first, or "zero" period.
Many projects require additional investment in subsquent periods causing negative net cash flows. When this occurs there is actually more than one IRR making this an unreliable measurement to evaluate projects with.
There are numerous ways to calculate ROI. It can be defined as the net gain on investment divided by the total cost incurred. The method of calculating ROI demonstrated in this tutorial divides the NPV by the total discounted cash outflows.
Tutorial demonstrating how to calculate NPV, IRR and ROI for an investment. Demonstrates manual calculation of present values as well as the use of NPV and IRR functions in Excel.
Video tutorial shows how to use and calculate:
The spreadsheet used in the video can be downloaded here.