The SUMX2MY2 function in Google Sheets is useful when you need to easily find the sum of the differences of the squares of values in two arrays.
This function is the Google Sheets function equivalent of calling Σ(x²–y²) where x and y correspond to values from two different arrays.
Table of Contents
The rules for using the SUMX2MY2
function in Google Sheets are as follows:
 The function requires two different arrays as input. They may also be cell ranges.
 The function outputs the sum of the differences of the squares of each pair of values in the two arrays
Let’s learn how to write the SUMX2MY2
function ourselves in Google Sheets and later test out the function with actual values.
The Anatomy of the SUMX2MY2 Function
So the syntax (the way we write) the DAYS function is as follows:
=SUMX2MY2(array_x, array_y)
Let’s dissect the function and understand what each of these terms means:
 = the equal sign is how we start any function in Google Sheets.
 SUMX2MY2() is our
SUMX2MY2
function. The function returns the sum of the difference of squares of corresponding values in the two provided arrays  array_x refers to the array or cell range whose squares will be reduced by the squares of corresponding entries in array_y and later added together.
 array_y refers to the array or cell range whose squares will be subtracted from the squares of corresponding entries in array_x and later added together.
 Do note that the order of arguments is important since subtraction is involved.
A Real Example of Using SUMX2MY2 Function
Let’s look into an example of the SUMX2MY2
function being used in a Google Sheet spreadsheet.
In the worksheet below, we have two arrays we want to perform the operation with. Column C manually computes the difference of the squares of each corresponding value pair in the two arrays. Cell C7 sums up all these differences, giving us 64.
In cell D2, our SUMX2MY2 function easily outputs the same result without having to use any other function!
You can make a copy of the spreadsheet above using the link I have attached below.
If you’re interested in trying out the SUMX2MY2 function in Google Sheets, let’s begin writing it ourselves!
How to Use SUMX2MY2 Function in Google Sheets
 First, we should locate the two arrays we’ll be running through our function.
 To begin using the
SUMX2MY2
function, select the cell we will first put our function’s output. In this example, we’ll output the result in cell C1  Next, we just simply type the equal sign ‘=‘ to begin the function, followed by ‘SUMX2MY2(‘. Do note not to confuse this function with the similarly named
SUMX2PY
andSUMXMY2
functions.  As seen in the image below, a tooltip box appears with info on the
SUMX2MY2
function. We can click on the arrow on the toprighthand corner of the box to minimize the popup if necessary.  The next step is to select the two cell ranges we want to run through our function. We can easily drag the cell ranges to achieve the formula below.
 Afterward, press the Enter key to evaluate our formula. We should be able to now see the final result in cell C1.
Frequently Asked Questions (FAQ)

 What happens if my two arrays have a different number of values?
TheSUMX2MY2
function requires that both arrays have the same number of values. If the number of values is unequal, then theSUMX2MY2
function will return a ‘#N/A‘ error value  What would happen if my ranges are equal but some rows are empty or invalid?
As seen in the table below, theSUMX2MY2
will still evaluate arrays with missing values, as long as the arrays are of equal length. Only the valid pairs will be considered when computing the result. In the example below, the function only added the results of rows 2, 6, and 8.
 What happens if my two arrays have a different number of values?
That’s everything you need to know to use the SUMX2MY2
function in Google Sheets easily. This stepbystep guide shows how easy it is to find the difference of squares of corresponding values in two arrays in Google Sheets.
You can now use the SUMX2MY2
functions in Google Sheets together with the various other Google Sheets formulas available to create useful spreadsheets to help boost your productivity and workflow.
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