Tools for the financial analyst

The bad news is that Excel has none of its own financial functions to find the profitability index. The good news however is that tadXL, a library of financial functions offers a large number of financial functions including one to find the financial PI. Here, me Abraham A. as your guide will demonstrat the use of tadPI function to calculate the profitability index using Excel formula.

Profitability index in Excel

The profitability index is one the tools that are used by a financial analyst in evaluating investments to find an investor's ROI - return on investment. It is a ratio of discounted profits over discounted expenditures that show the relative profitability of one investment over the other investments. To find manually will require the sum of discounted profits and the sum of discounted expenditures and their ratio will result in the profitability index. Excel offers no such financial functions to find the profitability index however 3rd party tools like tadXL add-in for Excel 2007, 2010, and 2013 offer tadPI function. This particular function is one of several financial functions in the tadXL package that are used for investment analysis.

Before we proceed to find profitability index in Excel, you would need the tadXL add-in which is available for download here. There are different versions of this add-in i.e. v0.5, v1.0, v2.0 and v2.5 and you would have to select one of them for installation.

Excel financial PI function

The profitability index Excel function requires the following values as input:
=tadPI ( discount_rate, cash_flows, type, compounding, period, distribution )

 cash flows -100 50 40 30 10 rate 5% 5% 5% 5% 5% compounding 1 1 0.0833 0.0833 0 period 1 1 0.0833 0.0833 1 distribution 1 0.5 1 0.5 1 Financial PI 1.1804 1.2096 1.2892 1.2919 1.1776

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