Let's say you want to determine the size of a large spreadsheet to decide whether to use manual or automatic calculation in your workbook. To count all of the cells in a range, use a formula that multiplies the return values from the ROWS and COLUMNS functions.
Example
The example may be easier to understand if you copy it to a blank worksheet.
How to copy an example
 Create a blank workbook or worksheet.
 Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 In the worksheet, select cell A1, and press CTRL+V.
 To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

A 
B 
C 
D 
Data 
Data 
Data 
Data 
15,000 
28,500 
55,000 
87,000 
9,000 
13.700 
63,800 
23,000 
8,000 
1000 
19,000 
99,900 
Formula 
Description (Result) 


=ROWS(A1:D4) * COLUMNS(A1:D4) 
The total number of cells in the range (16) 



Function details
ROWS
COLUMNS