Returns a subtotal for a vertical range of cells using a specified aggregation function.
Sample Usage
SUBTOTAL(9,C2:C5)
SUBTOTAL(1,C2:C5,D2:D8)
Syntax
SUBTOTAL(function_code, range1, [range2])
 function_code  The number that specifies the function to use for the subtotal.

1 for AVERAGE

2 for COUNT

3 for COUNTA

4 for MAX

5 for MIN

6 for PRODUCT

7 for STDEV

8 for STDEVP

9 for SUM

10 for VAR

11 for VARP

 range1  The first range over which to calculate the subtotal.
 range2  Additional ranges over which to calculate subtotal(s).
Examples
SUBTOTAL(9,C2:C5) returns the sum of the subtotal of the cells C2:C5.
SUBTOTAL(1,C2:C5,D2:D8) returns the average of the numbers contained in the ranges C2:C5 and D2:D8.
Notes
 If you want to skip the hidden values in your calculation, use the following codes:
 101 for AVERAGE
 102 for COUNT
 103 for COUNTA
 104 for MAX
 105 for MIN
 106 for PRODUCT
 107 for STDEV
 108 for STDEVP
 109 for SUM
 110 for VAR
 111 for VARP
 The SUBTOTAL function ignores any rows that are not included in the result of a filter, irrespective of the function_code used.
 Using SUBTOTAL helps prevent doublecounting associated with the SUM function. If there are other subtotals within range1, range2,… (or nested subtotals), these nested subtotals are ignored to avoid double counting.
 The SUBTOTAL function is designed for columns of data, or vertical ranges. It is not designed for rows of data, or horizontal ranges. For example, when you subtotal a horizontal range using a function_code of 101 or greater, such as SUBTOTAL(109,B2:G2), hiding a column does not affect the subtotal. But, hiding a row in a subtotal of a vertical range does affect the subtotal.