Formula in Excel 365
Quick way to transform your data without using formulas
Sometimes, especially when you work with a lot of data, you need to transform it. If you need to convert some range of data by dividing or multiplying it, it can be done in Excel in two clicks:
How to count cells by criteria
Use COUNTIF if you need to sum values for a particular person or another criterion.
How to sum cells by criteria
Use SUMIF if you need to sum values for a particular person or another criterion.
Hide formulas from appearing in the edit bar
You can usually view formulas in an Excel cell when the cell is selected, but you can protect a spreadsheet by hiding the formulas in some cells.
How to generate series of dates
Often you'll want to insert a series of dates into a worksheet. The most efficient way to enter a series of dates doesn't require any formulas - just use Excel's AutoFill feature.
The Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.
Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
Calculating the difference between two time stamps
Because timestamps are represented as serial numbers, you can subtract the earlier time from the later time to get the difference.
Calculating the number of work days between two dates
When calculating the difference between two dates, you may want to exclude weekends and holidays.
Counting the number of unique values
You can easily count the number of unique values of the range using a simple formula.