Count birthdays by month
You would think you could use the COUNTIF function to count birthdays, but the trouble is COUNTIF only works with ranges, and won't let you use something like MONTH to extract just the month number from...Read more
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Featured Functions
STOCKHISTORY Function
The STOCKHISTORY function retrieves historical stock price information based on a given symbol and date range. The main purpose of STOCKHISTORY is to get the history of a financial instrument over time. Although the name suggests that STOCKHISTORY is meant to work only with stocks,...Read more
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Modeling the 4 Percent Retirement Rule in Excel
The 4% retirement rule suggests you can safely withdraw 4% of your portfolio in year one of retirement, then adjust that amount for inflation each year for 30 years without running out of money. But how does this actually play out year by year? This article builds a complete Excel model to...Read more
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