Excel #SPILL! error - causes and fixes

What does #SPILL mean in Excel? It's an error that occurs when a formula is unable to populate multiple cells with the calculated results. To learn what can trigger this error and how you can resolve it, please keep reading.

Just imagine this: you upgraded to Microsoft Office 365 with the latest Excel updates and for some reason the tried and tested formulas you've been using for years have suddenly stopped working. Whatever you do, you are now getting a #SPILL error. Does anyone know what it means? Of course, we do, and you'll get your solution in a moment :)

What does #SPILL mean in Excel?

Generally, a #SPILL! error occurs when a formula produces multiple results but cannot output them all on the sheet.

Before we dive into specific use cases, let's get a general understanding of spilling in Excel.

With the launch of dynamic arrays in Excel 365, any formula that produces multiple calculation results automatically "spills" those results into neighboring cells. Please notice, any formula, even the ones that were not initially designed to handle arrays. A range of cells containing the results is called a spill range. And if something on the sheet prevents filling that range, a #SPILL error occurs.

For the most part, this behavior is understandable and predictable. For instance, if your formula is expected to return more than one value, but the nearby cells are filled with some other data, simply delete that data, and an error will be gone.

But sometimes the reasons are not so obvious and therefore confusing. Perhaps, one or more cells in the spilled area contain a space or a non-printing character invisible to a human eye. Or the same formula copied across the entire column blocks a spill range. Or, you might have run into one of the very few features that do not support dynamic arrays. To fix an error, you'll have to investigate each case individually and determine the root of the problem.

#SPILL error in Excel

How to fix #SPILL! error in Excel

As mentioned above, a #SPILL! error might be caused by various reasons. To know the exact root of the problem, click the warning icon (a yellow diamond with an exclamation point), and read the message in the first line highlighted in grey:

The cause of a #SPILL error

Once you determined the cause, please find the corresponding example below with the detailed instructions on how to resolve that particular case.

Spill range isn't blank

Reason: The area to be populated with the formula results contains non-empty cells.

Solution: Clear the expected spill range.

In a simplest scenario, just click the formula cell and you will see a dashed border indicating the spill range boundaries - any data inside it is an obstacle. So, either remove the existing data from the spill area or move the formula to another location where there is no blockage.

Non-empty cells in a spill range

In some situations, however, a spill range may look blank, but in fact it is not. The problem may be in invisible characters such as a space lurking in some cells, or formulas returning an empty string.

To detect such cells, click a warning sign, and you will see this explanation - Spill range isn't blank. Underneath it, there are a number of options. Click Select Obstructing Cells, and Excel will show you which cells prevent the formula from spilling.

In the screenshot below, the obstructing cell is A6, which contains an empty string ("") returned by the formula.

Select obstructing cells that prevent the formula from spilling.

To clear blocking cells, go to the Home tab > Editing group, and click Clear > Clear All.

Spill range contains merged cells

Reason: Spilling does not work with merged cells.

Solution: Unmerge cells in the spilled area or move the formula to another location that has no merged cells.

In case there are one or more merged cells in a projected spilled array, the following error message is displayed - Spill range has merged cell.

If you have difficulties detecting the merged cells visually, make use of Select Obstructing Cells option to jump to the problematic cells:

A SPILL error is caused by merged cells.

Spill range in table

Reason: Dynamic arrays are not supported in Excel tables.

Solution: Convert the table to a normal range or place the formula outside the table to allow it to spill. It's not quite clear why dynamic array formulas do not work from within Excel tables (maybe because of the specific syntax of structured references), but anyway these two very useful things do not get along :(

Dynamic arrays are not supported in Excel tables.

To confirm the root cause of the problem, click an icon with an exclamation mark, and you will see this text in the first line - Spill range in table.

SPILL error is caused by a dynamic array within a table.

In this case, the best thing you could do is to convert table to range. For this, right-click anywhere within the table, and then click Table > Convert to Range. Alternatively, you can move your formula beyond the table boundaries.

Spill range is unknown

Reason: Excel is unable to establish the size of the spilt array.

Solution: Try to work out a different formula for your task.

When using volatile functions such as RANDARRAY, RAND or RANDBETWEEN in combination with dynamic array functions, a #SPILL error may occur because the array returned by a volatile function changes between the spreadsheet's calculations and the "wrapper" function cannot determine its size.

In such situation, an error message says - Spill range is unknown.

For example, the following formula throws a #SPILL! error because the RANDBETWEEN output continuously changes and SEQUENCE does not know how many values to generate:

=SEQUENCE(RANDBETWEEN(1,100))

A volatile array is causing a SPILL error.

Spill range is too big

Reason: Excel is unable to output a spilt array as it extends beyond the spreadsheet edges.

Solution: Instead of calculating entire columns, reference a used range, a single cell, or add the @ operator to perform implicit intersection.

It is the most complex case and depending on your goal and the worksheet's structure you may need to adjust your formulas differently. Here, we are going to demonstrate a general approach on a very simple example.

Supposing you have a list of numbers in column B, and in column C you wish to return 10% of those numbers.

In traditional Excel 2019 and earlier, the following formula worked without a hitch (in the left part of the image below, it's in cells C2 through C7):

=B:B*10%

In dynamic Excel 365, the same formula triggers a #SPILL error.

A SPILL error occurs because there isn't enough space to display all the results.

The cause of the error is Spill range is too big.

Spill range is too big.

Why is the formula broken in new Excel? Because implicit intersection is no longer silently performed in the background. The term sounds mysterious, but the logic behind it is quite simple - reduce multiple values to a single value.

In pre-365 versions, that was the default behavior of Excel - since a cell could only contain one value, a formula was forced to return a single result. In our example, even though we supply a whole column (B:B), Excel processes just one value on the same row as the formula. So, the formula in C2 calculates 10% of the value in B2, the formula in C3 calculates 10% of the value in B3, and so on.

In dynamic array Excel, the default behavior is different - any formula that can potentially return multiple results automatically spills them onto to the worksheet. In our case, Excel multiplies each cell in column B by 10%, gets over a million results (more precisely 1,048,576), tries to output all of them in column C beginning in C2, but reaches the end of the worksheet grid - hence a #SPILL error. Guess what happens if we put the formula in C1? Yep, it will work because this time there are enough cells to fill - the spill range will occupy exactly 1,048,576 cells!

Solution 1. Refer to ranges rather than columns

This is a very reasonable approach - instead of referencing entire columns, reference only the relevant data. Apart from fixing a #SPILL error, it also helps to save Excel resources and improve performance.

For our sample dataset, the formula is:

=B2:B10*10%

The formula is entered just in one cell (C2). The result is a dynamic array that spills into multiple cells automatically:

Refer to ranges rather than columns.

Note. Because dynamic arrays are not supported in Excel tables, this solution only works within a normal range.

Solution 2. Calculate a single cell and copy the formula down

It is the traditional approach - reference one cell on the same row and copy the formula down.

In our case, the below formula goes to C2, and then you drag it down through C10:

=B2*10%

Unlike dynamic array formulas, this conventional formula style works in ranges and tables equally well:

Reference a single cell and copy the formula down.

Solution 3. Apply implicit intersection

This approach is a bit more complicated - use the implicit intersection operator (@ symbol) which was introduced in Excel 365 as part of the dynamic arrays update.

In your formula, insert the @ character where you want to reduce an array or a range to a single value, e.g. before a range/column/row reference, function or expression. Enter the formula in the topmost cell, and then drag it down across as many rows as needed.

For our sample dataset, the formula takes this shape:

=@B:B*10%

Since the result is a single value, not a dynamic array, this formula can be used both in ranges and tables. In the latter case, however, a structured reference would be a more elegant and effective solution:

=[@Sales]*10%

Use implicit intersection to fix a SPILL error in Excel 365.

To some extent, this explains why the "@" character occasionally appears in formulas created in older versions - to retain compatibility. Because in pre-dynamic Excel, formulas cannot spill into multiple cells, the implicit intersection operator secures the same behavior when the formula is imported in dynamic array Excel.

My personal advice is to use this approach with care because it disables a great new feature of Excel that is very efficient and helpful in many scenarios.

That's how to troubleshoot and fix a #SPILL error in Excel. In the incoming article, we are going to investigate and resolve this error in a few popular formulas such as VLOOKUP, INDEX MATCH, SUMIF, etc. Thank you for reading and please stay tuned!

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