The earnings and price correlated historical graph (the main graph) includes forecasting data when you are running timeframes.  In contrast, the “Historical” normal P/E ratio forecasting calculator is utilizing only completed historical data.

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Therefore, in order to get the same normal P/E ratio on both the main graph and the forecasting graph, you have to scroll all of the earnings that are marked with a capital “E” off of the main graph, and then click the number of years you are looking for.  By doing this, you will get the pure historical normal P/E ratio with no forecasting data included.

Here is an example below – using the 10-year timeframe:

Normal PE

Article by F.A.S.T. Graphs