To count the number of cells that contain errors, you can use the ISERR and NOT functions, wrapped in the SUMPRODUCT function. In the generic form of the formula (above) rng represents the range in which you'd like to count cells with no errors.
In the example, the active cell contains this formula:
SUMPRODUCT accepts one or more arrays and calculates the sum of products of corresponding numbers. If only one array is supplied, it just sums the items in the array.
The ISERR function is evaluated for each cell in rng. Without the NOT function, the result is an array of values equal to TRUE or FALSE:
With the NOT function, the result is:
This corresponds to cells that do not contain errors in the rng.
The -- operator (called a double unary) forces the TRUE/FALSE values to zeros and 1's. The resulting array looks like this:
SUMPRODUCT then sums the items in this array and returns the total, which in the example is the number 3.
You can also use the SUM function to count errors. The structure of the formula is the same, but it must be entered as an array formula (press Control + Shift + Enter instead of just Enter). Once entered, the formula will look like this:
The Excel ISERROR function returns TRUE for any error type excel generates, including #N/A, #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, or #NULL! You can use ISERROR together with the IF function to test for errors and display a custom message, or...
The SUMPRODUCT function multiplies ranges or arrays together and returns the sum of products. This sounds boring, but SUMPRODUCT is an incredibly versatile function that can be used to count and sum like COUNTIFS or SUMIFS, but with more...
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