This method will introduce the SUBTOTAL function and AGGREGATE function to count ignoring manually hidden cells or rows in Excel.

For example I have manually hidden some rows in a table as below screenshot shown. And I will walk you through counting the number of cells excluding all hidden cells and rows in detail.

Select a blank cell you will place the counting result into, type the formula =SUBTOTAL(102,C2:C22) (C2:C22 is the range where you want to count ignoring manually hidden cells and rows) into it, and press the Enter key.

And now you will get the number of cells in specified range ignoring all manually hidden cells or rows.

Notes:
(1) For counting the number of all kinds of cells with excluding manually hidden cells and rows, please apply this formula =SUBTOTAL(103,A2:A22).
(2) In Excel 2010 or higher version, you can also apply the formula =AGGREGATE(2,3,C2:C22) to count the amount of number cells with ignoring manually hidden cells and rows. See below screenshot; and apply the formula =AGGREGATE(3,3,A2:A22) to count the amount of all kinds of cells with ignoring manually hidden cells and rows.

(3) All above formulas will not ignore cells of hidden columns.

For example I have manually hidden 3 columns and 4 rows in a table as below screenshot shown, and I will show you the details to count the amount of all kinds of cells with ignoring all hidden rows and columns by the COUNTVISIBLE function of Kutools for Excel.

Select a blank cell you will place the counting result into, and type the formula =COUNTVISIBLE(B2:H11) (B2:H11 is the range where you will count cells ignoring hidden cells/rows/columns) into it, and press the Enter key.

And now you will get the total number of all kinds of cells in the specified range with excluding all hidden rows and columns. See screenshot:

Note: You can also apply this COUNTVISIBLE function as follows: 1. Select a blank cell and click Kutools > Functions > Statistical & Math > COUNTVISIBLE.

2. In the opening Function Arguments dialog box, please specify the range you will count cells ignoring all manually hidden rows and column into the Reference box, and click the OK button. See above screenshot:

Sum/Count/Average visible cells only in a specified range with ignoring hidden or filtered cells/rows/columns

The normally SUM/Count/Average function will count all cells in the specified range on matter cells are hidden/filtered or not. While the Subtotal function can only sum/count/average with ignoring hidden rows. However, Kutools for Excel SUMVISIBLE/COUNTVISIBLE/AVERAGEVISIBLE functions will easily calculate the specified range with ignoring any hidden cells, rows, or columns.

Sum only filtered or visible cells in Excel

Get max/min of visible cells only in Excel