Author: Oscar Cronquist Article last updated on July 01, 2022 This article demonstrates two formulas, they both accomplish the same thing. The Excel 365 formula is much smaller and is easy to modify if more columns are needed in the formula.

## Merge two columns with possible blank cells - Excel 365 This example works only in Excel 365, it contains three functions only available for Excel 365: LET, VSTACK and FILTER. A dynamic array formula is entered as a regular formula, however, it spills values to adjacent cells automatically as far as needed.

Dynamic array formula in cell F3:

=LET(x, VSTACK(B3:B8, D3:D6), FILTER(x,x<>""))

### Explaining formula

#### Step 1 - Stack cell ranges vertically

The VSTACK function combines cell ranges or arrays. Joins data to the first blank cell at the bottom of a cell range or array (vertical stacking).

VSTACK(array1, [array2], ...)

VSTACK(B3:B8,D3:D6)

becomes

VSTACK({"AA"; "DD"; 0; "GG"; "HH"; "TT"}, {"MM"; 0; "WW"; "TT"})

and returns

{"AA"; "DD"; 0; "GG"; "HH"; "TT"; "MM"; 0; "WW"; "TT"}.

#### Step 2 - Remove blanks

The FILTER function filter values/rows based on a condition or criteria.

FILTER(arrayinclude, [if_empty])

FILTER(VSTACK(B3:B8,D3:D6),VSTACK(B3:B8,D3:D6)<>"")

becomes

FILTER(VSTACK(B3:B8,D3:D6),{"AA"; "DD"; 0; "GG"; "HH"; "TT"; "MM"; 0; "WW"; "TT"}<>"")

becomes

FILTER(VSTACK(B3:B8,D3:D6), {TRUE; TRUE; FALSE; TRUE; TRUE; TRUE; TRUE; FALSE; TRUE; TRUE})

becomes

FILTER({"AA"; "DD"; 0; "GG"; "HH"; "TT"; "MM"; 0; "WW"; "TT"}, {TRUE; TRUE; FALSE; TRUE; TRUE; TRUE; TRUE; FALSE; TRUE; TRUE})

and returns

{"AA"; "DD"; "GG"; "HH"; "TT"; "MM"; "WW"; "TT"}.

#### Step 3 - Shorten formula

The LET function lets you name intermediate calculation results which can shorten formulas considerably and improve performance.

LET(name1name_value1calculation_or_name2, [name_value2calculation_or_name3...])

FILTER(VSTACK(B3:B8,D3:D6),VSTACK(B3:B8,D3:D6)<>"")

VSTACK(B3:B8,D3:D6) is repeated twice in the formula above. I will name this intermediate calculation x.

LET(x,VSTACK(B3:B8,D3:D6),FILTER(x,x<>""))

The result is a smaller formula.

## Merge two columns with possible blank cells - earlier versions

### Question:

I do have one question:

Let's say my "List 1" is auto updated and the number of entries in this list will fluctuate. Since the number of entries fluctuates, I would like to select a larger range than I actually have data in currently. The issue is when I make my "List 1" larger than the number of entries, the rows that don't currently have data in them, show up on my combined list as zeros.

So my question is, is there a way to adjust the formula so that when it looks at "List 1" for example, it skips over blank cells and continues to combine the list with "List 2".

(You can find the question here: Merge two columns into one list in excel)

The array formula below removes blank cells. Another method is to use dynamic named ranges. Array formula in C2:

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A1))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A1)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

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This is an array formula, here is how to enter it. Type the formula in cell C2, press and hold CTRL + SHIFT simultaneously. Press Enter once. Release all keys. If you did it correctly, you now have curly brackets before and after the formula.

Copy cell C2 and paste it to cells below, as far as needed.

This example merges two columns into one column using an array formula. If you are looking for merging two data lists with criteria, check this post: Merge lists with criteria

### Named ranges

List1 (A2:A7)
List2 (B2:B5)

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### Explaining array formula in cell C8

#### Step 1 - Understand relative and absolute cell references

In cell C2 the formula is:

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A1))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A1)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

In cell C8 the formula is:

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

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#### Step 1 - Find cells containing a value in List 1 and return row numbers in an array

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1)

becomes

IF(ISBLANK({"AA";"DD";"";"GG";"HH";"TT"}), "", ROW(A2:A7)-MIN(ROW(A2:A7))+1)

becomes

IF({FALSE;FALSE;TRUE;FALSE;FALSE;FALSE}, "", {2;3;4;5;6;7}-MIN({2;3;4;5;6;7})+1)

becomes

IF({FALSE;FALSE;TRUE;FALSE;FALSE;FALSE}, "", {2;3;4;5;6;7}-2+1)

becomes

IF({FALSE;FALSE;TRUE;FALSE;FALSE;FALSE}, "", {1;2;3;4;5;6})

and returns

{1;2;"";4;5;6}

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#### Step 2 - Return the k-th smallest row number

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

SMALL(array,k) Returns the k-th smallest number in this data set.

SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))

becomes

SMALL({1;2;"";4;5;6}, 8 )

and returns #NUM

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#### Step 3 - Return a value of the cell at the intersection of a particular row and column

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

INDEX(array,row_num,[column_num]) returns a value or reference of the cell at the intersection of a particular row and column, in a given range

INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7)))

becomes

INDEX(List1, #NUM)

and returns

#NUM

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Gets a value in a specific cell range based on a row and column number.

#### Step 4 - Check if formula returns an error

=IFERROR(INDEX(List1, SMALL(IF(ISBLANK(List1), "", ROW(List1)-MIN(ROW(List1))+1), ROW(A7))), IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

becomes

=IFERROR(#NUM, IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), ""))

becomes

IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), "")

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#### Step 5 - Find cells containing a value in List 2

IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), "")

IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1)

becomes

IF(ISBLANK({"MM";"";"WW";"TT"}), "", {2;3;4;5}-MIN({2;3;4;5})+1)

becomes

IF({FALSE;TRUE;FALSE;FALSE}), "", {1;2;3;4})

and returns

{1;"";3;4}

#### Step 6 - Return the k-th smallest row number

IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A8)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), "")

SMALL(array,k) Returns the k-th smallest number in this data set.

SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A8)-SUMPRODUCT(--NOT((ISBLANK(List1)))))

becomes

SMALL({1;"";3;4}, ROW(A7)-SUMPRODUCT(--NOT((ISBLANK(List1)))))

becomes

SMALL({1;"";3;4}, 7-SUMPRODUCT(--NOT((ISBLANK({"AA";"DD";"";"GG";"HH";"TT"})))))

becomes

SMALL({1;"";3;4}, 7-SUMPRODUCT(--NOT({FALSE;FALSE;TRUE;FALSE;FALSE;FALSE})))

becomes

SMALL({1;"";3;4}, 7-SUMPRODUCT(--{TRUE;TRUE;FALSE;TRUE;TRUE;TRUE}))

becomes

SMALL({1;"";3;4}, 7-SUMPRODUCT({1;1;0;1;1;1})

becomes

SMALL({1;"";3;4}, 7-5)

becomes

SMALL({1;"";3;4}, 2)

and returns 3.

#### Step 6 - Return a value of the cell at the intersection of a particular row and column

IFERROR(INDEX(List2, SMALL(IF(ISBLANK(List2), "", ROW(List2)-MIN(ROW(List2))+1), ROW(A8)-SUMPRODUCT(--NOT((ISBLANK(List1)))))), "")

becomes

IFERROR(INDEX(List2, 3), "")

becomes

IFERROR(INDEX({"MM";0;"WW";"TT"}, 3), "")

becomes

IFERROR("WW", "")

and returns WW.