This article describes the formula syntax and usage of the IFERROR function in Microsoft Excel.
Description
Returns a value you specify if a formula evaluates to an error; otherwise, returns the result of the formula. Use the IFERROR function to trap and handle errors in a formula.
Syntax
IFERROR(value, value_if_error)
The IFERROR function syntax has the following arguments:

Value Required. The argument that is checked for an error.

Value_if_error Required. The value to return if the formula evaluates to an error. The following error types are evaluated: #N/A, #VALUE!, #REF!, #DIV/0!, #NUM!, #NAME?, or #NULL!.
Remarks

If Value or Value_if_error is an empty cell, IFERROR treats it as an empty string value ("").

If Value is an array formula, IFERROR returns an array of results for each cell in the range specified in value. See the second example below.
Examples
Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.
Quota 
Units Sold 

210 
35 

55 
0 

23 

Formula 
Description 
Result 
=IFERROR(A2/B2, "Error in calculation") 
Checks for an error in the formula in the first argument (divide 210 by 35), finds no error, and then returns the results of the formula 
6 
=IFERROR(A3/B3, "Error in calculation") 
Checks for an error in the formula in the first argument (divide 55 by 0), finds a division by 0 error, and then returns value_if_error 
Error in calculation 
=IFERROR(A4/B4, "Error in calculation") 
Checks for an error in the formula in the first argument (divide "" by 23), finds no error, and then returns the results of the formula. 
0 
Example 2
Quota 
Units Sold 
Ratio 
210 
35 
6 
55 
0 
Error in calculation 
23 
0 

Formula 
Description 
Result 
=C2 
Checks for an error in the formula in the first argument in the first element of the array (A2/B2 or divide 210 by 35), finds no error, and then returns the result of the formula 
6 
=C3 
Checks for an error in the formula in the first argument in the second element of the array (A3/B3 or divide 55 by 0), finds a division by 0 error, and then returns value_if_error 
Error in calculation 
=C4 
Checks for an error in the formula in the first argument in the third element of the array (A4/B4 or divide "" by 23), finds no error, and then returns the result of the formula 
0 
Note: The formula in the example must be entered as an array formula. After copying the example to a blank worksheet, select the range C2:C4, press F2, and then press CTRL+SHIFT+ENTER. 