Summary
To count rows in an Excel table, you can use the ROWS function. In the example shown, the formula in I4 is:
=ROWS(Table1)
The result is 100, since Table1 contains 100 rows of data.
Generic formula
=ROWS(table)
Explanation
This formula uses structured referencing, a syntax that allows table parts to be called out by name. When a table is called with the name only, Excel returns a reference to the data region of the table only. In this case, the entire table range is B4:F104 so Table1 returns the range B5:F105 to the ROWS function.
=ROWS(Table1)
=ROWS(B5:F105)
ROWS then returns a final result of 100. Note that the header row is not included in this count.