Excel Errors: The Ultimate Guide
Excel formula errors are inevitable and the more formulas you write, the more errors you’ll get. Understanding how to troubleshoot and fix #NULL!, #REF!, #DIV/0!, #NAME?, #N/A, #NUM!, #VALUE!, and ##### errors in Excel is something you shouldn’t postpone.
And even though it’s frustrating when you get an error after spending a lot of time on a complex formula, Excel errors are useful because they let us know that something is wrong with our approach. This is why I’ve put together a list of common Excel errors, along with explanation of what’s causing them and common fixes.
Table of contents:
- Excel’s error helper
- Fixing Errors
- #REF! error in Excel
- #REF! error while using VLOOKUP or INDEX
- #REF! error while using INDIRECT
- #REF! error while linking to another Excel file
- #VALUE! error in Excel
- #VALUE! error while subtracting
- #VALUE! error while using COUNTIF or COUNTIFS
- #VALUE! error while using SUMPRODUCT
- #VALUE! error while using VLOOKUP
- #DIV/0 error in Excel
- #N/A error in Excel
- #N/A error while using VLOOKUP, HLOOKUP or MATCH
- #NAME? error in Excel
- ##### error in Excel
- #NULL! error in Excel
- #NUM! error in Excel
- #SPILL error in Excel
- How to hide error messages in Excel using IFERROR, ISERROR or ISNA
Excel’s error helper
The good news is that each error value corresponds to a certain type of error, which helps you narrow it down to a handful of possible issues. In addition, Excel will display a small green triangle in the upper left corner of the cells affected by errors.
As you can see, the green triangle is visible in my cell because Excel has displayed a #NULL! error. A yellow diamond shape has appeared, which can be pressed to display Excel’s error menu.
So, what exactly is this menu used for?
- The gray row is telling us which error has been triggered.
- “Help on this Error” link will open Excel’s help panel, where you can find hints on how to fix your error.
- “Show Calculation Steps…” link will prompt the Evaluate Formula panel, where you can check every single step of your formula and see exactly which one is triggering the error.
- “Ignore Error” link does exactly that – it removes the green triangle from your cell and ignores the error.
- “Edit in Formula Bar” link takes you to the formula bar to modify your formula.
- “Error Checking Options…” link opens the Error settings. Here you can tweak and customize Excel’s settings related to how errors are displayed and what type of errors to look for, as well as reset the ignored errors from your workbook.
Excel displays 9 types of errors (8 types if you are not using Office 365) and you should understand what triggers them and how to fix your broken formula.
Fixing your Excel errors is a multi-step process. Remember that even though a cell shows an error, it doesn’t mean that it’s the cell causing it. Often times errors cascade from one cell to another or even from different sheets or workbooks. If you fix the underlying error, all the other formulas will be fixed as well. Here is the 5 steps process I use for fixing my Excel errors:
1. Finding the errors. You can use Go to Special > Formula by pressing Ctrl + G and then selecting Special. Alternatively, you can go to Home tab, Editing, and then Find & Select as shown below.
2. Select all cells with errors using the Go To Special menu. This way we can see all cells which return error messages.
3. Trace the error back to its source. The Formula Auditing menu provides great features to trace back errors to the source or check which cells are propagating your errors.
4. Figure out what’s causing the error. If you have a complex formula, then it can be a good idea to break it down into smaller parts. You can also use the Evaluate Formula option and see exactly which step generates the error.
5. Fix the source of errors. When you find the cell which is causing the error and fix the formula, all your other dependent errors will get fixed as well.
#REF! error in Excel
The #REF! error is very common and shows up when a formula refers to a cell that is not valid. Usually the cell has been deleted or other cells have been pasted over (using cut and paste). If you see #REF errors appearing after you delete a row or a column, it is wise to click Undo (or use the shortcut Ctrl + Z), evaluate your formula and decide whether you should replace that cell or remove it.
If you cannot recover deleted data, it is good practice to perform a search in your workbook for #REF! and correct all the affected formulas. If a lot of errors accumulate in your Excel file, it will lead to performance issues like delays in calculating formulas or Excel crashes.
The easiest way to prevent #REF! errors is to check for dependent cells. You can easily see all the cells that link to the cell you want to delete by using the Trace Dependents option located in the Formula Auditing section of the Formula Tab. This way, you will know exactly which formulas will be affected if you delete a certain cell from your worksheet.
#REF! error while using VLOOKUP or INDEX
VLOOKUP and INDEX functions can also generate #REF! errors whenever you use incorrect range references. For example, if you specify a value for the col_index_num parameter which is higher than the total number of columns in your table, VLOOKUP and INDEX will return a #REF! error message.
If you ever encounter #REF! errors within your lookup formulas the first thing you should do is check your parameters and correct them. Use caution when you delete columns from a range that serves as the table_array argument because it will break your VLOOKUP formulas. A safe approach would be to switch from a hard coded value to a relative approach using MATCH function. If you want to learn more about lookup in Excel, read the following articles on how to use VLOOKUP or how to use INDEX-MATCH.
#REF! error while using INDIRECT
For those of you who use INDIRECT to create dynamic links, please note that referencing a closed workbook in an INDIRECT formula will result in a #REF! error. In this case, opening the linked workbook will remove the error and your formula should work properly. Please note that closing the linked workbook will trigger the #REF! error again.
#REF! error while linking to another Excel file
Whenever you work with files saved on a server or shared location, there is a high chance you will run into this error. If your link turns into something like
[Test_link.xlsx]#REF'!$B$2 after opening a linked file then you should know there aren’t many options to restore your formulas. Your best bet is to close your file without saving it. When you reopen it, the error will not be there.
If you have saved your file then all your links will be transformed into #REF and you will not be able to revert them. In this case, restore a previous version of your file or use a locally saved backup.
Now, let me explain what is actually causing this so you can avoid it. For some reason, when you are using a shared location to save your files, Excel is having a hard time recognizing other workbooks which are linked to your current file. So, if you are opening a workbook directly from Windows Explorer (i.e. like you normally open files in Windows) and that file is linked from the current opened Excel workbook, it will generate #REF errors.
To avoid this, once you have linked to a file in your workbook, make sure you only open it from the Data tab, using the Edit Links option.
This tip alone will save you a lot of time, because if you mess up your formulas and don’t have a backup, then you will have to manually recreate them (which can be a pain).
#VALUE! error in Excel
This is probably the most common error code. Whenever you encounter a #VALUE! error in Excel it means that something is wrong with the cells you are referencing.
The most frequent solution is to check for different data types in your formula. For example, trying to add a number (i.e. 27) with a text cell (i.e. John) will result in a #VALUE! error message. Now, I know you are not adding numbers with text, but there are scenarios when you may be doing it without even knowing it. For example, if you work with large data sets or download a database from your CRM, they may contain data that looks like numbers but it is in fact stored as text.
Also, referencing cells which have #VALUE! errors will cause most of the functions to return a #VALUE! error as well. Below you can see how AVERAGE, SUM, CONCATENATE and SUBTOTAL return errors just because they are using the input from column G which returns a #VALUE! error. So, if you can’t figure out why your formulas are returning a #VALUE! error, make sure you also check your input.
#VALUE! error while subtracting
If you are using the Windows version of Excel you might get the #VALUE! error when writing basic subtraction formulas. If a simple formula like =B3-C3 returns a #VALUE! error, then you will have to check Windows Region and language settings. To learn more please refer to this official article from Microsoft.
#VALUE! error while using COUNTIF or COUNTIFS
There are two main reasons why COUNTIF or COUNTIFS will return a #VALUE! error. The first one, and most often, is caused by formulas which link to cells in closed workbooks. However, COUNTIF and COUNTIFS functions will not always return #VALUE! error when linking to closed workbooks. From my experience this happens most often when you are working on a remote environment like SharePoint or an external server. This is a known issue with other Excel functions like COUNTBLANK, SUMIF or SUMIFS.
How to fix this #VALUE! error? Simply open the linked workbook from your formula, and then press F9 to refresh the formula.
The second reason why COUNTIF will throw in the #VALUE! error is related to your search string. Keep in mind that Excel cannot use a string longer than 255 characters as your search criteria in COUNTIF function. This means that you will have to shorten the string used in your COUNTIF or COUNTIFS formula in order for the functions to work properly.
#VALUE! error while using SUMPRODUCT
If you are working as an analyst and you are not using SUMPRODUCT then you are missing out. SUMPRODUCT is one of the most powerful and useful functions and I cannot stress this enough. It is versatile and can be easily used to create subtotals based on multiple criteria, it can replace SUMIFS and COUNTIFS, and it can even perform lookups.
However, if your SUMPRODUCT formulas are returning a #VALUE! error, then it means that somewhere in the arrays you have at least one cell containing text. This can be a table header, a comment column or even a single letter typed by mistake in your array. I am sure you accidentally typed in a Z when trying to use the Undo shortcut Ctrl + Z.
#VALUE! error while using VLOOKUP
If you work with VLOOKUP and your formula returns a #VALUE! error then there are two possible causes.
- The lookup_value argument is more than 255 characters. The quick solution is to shorten the lookup value. If you can’t use this approach, then use a combination of INDEX and MATCH functions as a workaround.
- The col_index_num argument contains text or is less than or equal to 0. Make sure you didn’t insert a negative value or zero by mistake. It’s easy to type 0 instead of 10 or insert additional letters. Double check your formula and correct any input mistakes.
#DIV/0 error in Excel
Since dividing by zero will result in no mathematical result that Excel can display, it will trigger a #DIV/0 error message. Whenever you see this message, it means that you are either dividing by a cell which is blank (and treated as zero) or part of your formula that is treated as the divisor equals zero. In order to fix it evaluate your formula and check which part is triggering the error.
#N/A error in Excel
The #N/A error is Excel’s way of telling you that your formula can’t find what you are looking for. This is most common with VLOOKUP, HLOOKUP, LOOKUP and MATCH functions.
#N/A error while using VLOOKUP, HLOOKUP, LOOKUP or MATCH
If you are using exact match for your lookup functions, then the #N/A error means that no matching result has been found. In order to fix the error, check you data series manually. If the value you are looking for exists, then it means that there may be additional spaces before or after your data.
For Excel, an exact match means that the strings need to be identical. So, if you are looking for “Jane” but your data series contains ” Jane” (two spaces before the text), then Excel will return #N/A because the two strings are considered different.
Most of the time all you need to do to prevent #N/A errors is to make sure that the lookup value is correct and that your lookup tables do not have data with ending spaces. In some cases it can even be useful to trap the error using IFERROR and display a more friendly message (or just hide the error). The final section of this article describes the use of IFNA, IFERROR and ISERROR to hide errors or display custom messages.
Visit this article if you want to learn how to use VLOOKUP in Excel.
#NAME? error in Excel
The #NAME? error indicates that Excel is not able to recognize part of your formula. It may be that you have misspelled a function name, you are referencing a named range that doesn’t exist, or simply entered a wrong cell reference.
Function name misspelled
Misspelling a functions name will make Excel unable to recognize your formula and display a #NAME? error. For example,
=SUN(A1:A2) is not a valid formula because the name of the function is not spelled correctly.
The range name used in formula does not exist
Another common mistake is using a range name which isn’t available or misspelling a range name. Most often this happens if you accidentally remove one of your named ranges and Excel is not able to recognize them anymore. Make sure that you double check your ranges before you delete them.
If you are manually writing the range in your formula (as opposed to selecting it your mouse or keyboard), you may run into a #NAME? if you forget to use a colon when defining your range. In the example above the MIN function is using an invalid range. The correct range reference is
J1:J3, so Excel will return an error.
Text not properly enclosed between double quotes
When you work with functions which handle text you have to make sure that you are enclosing your input between double quotes. Otherwise, Excel will not be able to recognize it as text. In the example shown above, the LEN function is not able to return the correct result because the input should be
"finance" and not
##### error in Excel
The most probable reason why Excel is displaying ##### instead of your input or result, is because the column isn’t wide enough to show all of the cell contents. Increase the width of the column and the error should go away. Also, try reducing the number of decimals, decrease the font size and increase the zoom. This will allow for more content to be displayed.
Alternatively, the ##### error can be caused by formulas which subtract dates or time. In Excel, negative values for dates and times are always shown as #####. To avoid this, try using date functions as much as possible when working with dates. For example, instead of just subtracting two dates try using a function like DATEDIF.
#NULL! error in Excel
Well, the #NULL! error isn’t something you will see very often. It basically means that you have incorrectly separated cell references in your formulas. For example, the formula
=SUM(A1 A10) will return a #NULL! error because the range lacks the colon “:” or comma “,” between the two cell references. All you need to do is adjust the range to
A1:A10 or separate the two cell by a comma and the error will go away.
#NUM! error in Excel
The #NUM! error is displayed when a number is too large or too small, or when a calculation isn’t possible. For example, it’s impossible to display 10^3000 because it is too large. Alternatively, if you are trying to calculate the square root of a negative number Excel will return a #NUM! error because this is impossible from a mathematical point of view.
#SPILL error in Excel
#SPILL error only applies to Office 365 and Excel Online. Basically, Excel is telling you that the spill range for a spilled array formula isn’t blank. You can read more about this error on Microsoft’s website.
How to hide error messages in Excel using IFERROR, ISERROR or ISNA
Sometimes you may get errors as part of the normal data analysis. An #N/A error in a VLOOKUP formula isn’t necessary bad. It just tells you that the value you are looking for couldn’t be found in the table array. However, that doesn’t mean #N/A errors are pretty and that is why it makes sense to replace them with a custom message like “value not found” or hide them altogether.
One word of caution though: verify that your formulas are correct before you trap and hide the errors. There is nothing worse than hiding a formula result because it generates an error created by a poor formula/data. For example, a VLOOKUP might return an #N/A error because there are beginning or ending spaces in your lookup value or table array. However, the value exists and hiding the error rather then fixing will return a wrong result.
Below I will show you 3 examples of how you can customize your error messages for a VLOOKUP formula. These can be applied to any formula you desire.
Your first option is to use IFNA function. This is perfect for displaying a custom message like “Not found” for your VLOOKUP formulas because the IFNA function only replaces your #N/A errors. In cell G6, I have used the formula
=IFNA(VLOOKUP(F3,B3:D12,3,FALSE),"Not found"). If the lookup value cannot be found (in our example Los Angeles Lakers is not included in the table array), then the formula will return an #N/A error. The IFNA formula result will be TRUE and the custom message will be shown. Alternatively, you can remove the custom message and just insert “” and Excel will display a blank cell (like cell G10).
The second option is to use IFERROR function. In cell G7 we have the formula
=IFERROR(VLOOKUP(F3,B3:D12,3,FALSE),"Not found") which will trap any error generated by our VLOOKUP, not just #N/A. For example, if you have a #VALUE! error while using VLOOKUP the message displayed will be the same as for the #N/A error. However, the #VALUE! error should be fixed and not hidden as a “Not found” message.
The third option is to use IF with ISERROR. This will achieve the same result as IFERROR but will also work in older versions of Excel. In our example, cell G8 contains the formula
=IF(ISERROR(VLOOKUP(F3,B3:D12,3,FALSE)),"Not found",VLOOKUP(F3,B3:D12,3,FALSE)). This works pretty much like any other IF formula. If the criteria is TRUE (the VLOOKUP formula returns an error) then display “Not found”, otherwise display the result of the VLOOKUP formula.
I hope that after reading this article you are much better equipped to identify the cause of your Excel errors. If you want, you can also download the file I used in this article.
Where do you struggle with Excel formula errors? Drop me a message in the comments section below.