Wiki link: Calculating personal returns
Some investors like to calculate their personal returns. This page provides a spreadsheet for Bogleheads to calculate their personal returns in a uniform manner.
The spreadsheet calculates two types of personal returns: an investor return which reports on how well the invested money has been growing so far, and a portfolio return which can be used to compare the past performance of the portfolio over a specific time period to widely available index and mutual fund returns or to the performance of another portfolio.
The spreadsheet also provides a growth of $10,000 chart for the portfolio.
On-going discussion and support for the spreadsheet is in this Bogleheads® forum topic: A Returns Spreadsheet for Bogleheads