How to identify missing numbers sequence in Excel?

Let's say you have a long list of sequence numbers to mark items, such as check numbers in bank statements, normally we scrolling through and locate the missing sequence numbers manually. Sometimes this is quite arduous and time-consuming. You may think of tricky ways to deal with it. Yes, there are several easy ways to identify and locate missing numbers sequence in Excel 2007, Excel 2010, and Excel 2013 quickly and conveniently.

Identify missing numbers sequence with IF formula

Identify missing numbers sequence with an array formula

Identify missing numbers sequence with VBA code

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We will show you the tutorials with an example as following screenshot shows:


arrow blue right bubble Identify missing numbers sequence with IF formula

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As we kwon, most of sequence numbers are with fixed increment of 1, such as 1, 2, 3, …, N. Therefore, if you can identify the number is not less 1 than its following number, there is a missing number.

1. In a blank cell, enter the formula of =IF(A2-A1=1,"","Missing"), and press the Enter key. In this case, we enter the formula in Cell C1.


If there is no missing numbers, this formula will return nothing; if missing numbers exist, it will return the text of "Missing" in active cell.

2. Select the cell C1 and drag the fill handle over the range of cells that you want to contain this formula. Now it identifies the missing numbers with the text of "Missing" in corresponding cells of Column C. See the following screenshot:


arrow blue right bubble Identify missing numbers sequence with an array formula

Sometimes it requires not only identifying missing numbers sequence, but also listing missing numbers too. You can deal it with following steps:

1. in the adjacent cell, please enter the formula = SMALL(IF(ISNA(MATCH(ROW(A$1:A$30),A$1:A$30,0)),ROW(A$1:A$30)),ROW(A1))

A1:A30 = range of numbers

The sequence to check against is 1 to 30

2. Press the Ctrl + Shift + Enter Keys together to finish the formula. Copy down the formula until you get #NUM! errors meaning all missing numbers have been listed. See screenshot:


arrow blue right bubble Identify missing numbers sequence with VBA code

With following VBA code, you can also get the missing numbers sequence in a new worksheet. Please do as this:

1. Hold down the ALT + F11 keys, and it opens the Microsoft Visual Basic for Applications window.

2. Click Insert > Module, and paste the following macro in the Module Window.

Sub Missingvalues()
Dim rng As Range
Dim rng1 As Range
Dim StartV As Single, EndV As Single, i As Single, j As Single
Dim k() As Single
Dim WS As Worksheet
ReDim k(0)
On Error Resume Next
Set rng = Application.InputBox(Prompt:="Select a range:", _
Title:="Extract missing values", _
Default:=Selection.Address, Type:=8)
StartV = InputBox("Start value:")
EndV = InputBox("End value:")
On Error GoTo 0
Set WS = Sheets.Add
WS.Range("A1:A" & rng.Rows.CountLarge).Value = rng.Value
With WS.Sort
.SortFields.Add Key:=WS.Range("A1"), _
SortOn:=xlSortOnValues, Order:=xlAscending, DataOption:=xlSortNormal
.SetRange Range("A1:A" & rng.Rows.CountLarge)
.Header = xlNo
.MatchCase = False
.Orientation = xlTopToBottom
.SortMethod = xlPinYin
End With
Set rng1 = WS.Range("A1:A" & rng.Rows.CountLarge)
For i = StartV To EndV
On Error Resume Next
j = Application.Match(i, rng1)
If Err = 0 Then
If rng1(j, 1) <> i Then
k(UBound(k)) = i
ReDim Preserve k(UBound(k) + 1)
End If
k(UBound(k)) = i
ReDim Preserve k(UBound(k) + 1)
End If
On Error GoTo 0
Next i
ReDim Preserve k(UBound(k) - 1)
WS.Range("B1") = "Missing values"
WS.Range("B2:B" & UBound(k) + 1) = Application.Transpose(k)
End Sub

3. Click doc-multiply-calculation-3 button to run the code, and a prompt box will pop out to tell you select a range that you want to use. See screenshot:


4. Then click OK, and enter the start value of your number sequence in the pop outing box.


5. And go on clicking OK, enter the end value of the number sequence. (Note: you must add 1 for your displayed end value, if your last value is 30, you should enter 31.) See screenshot:


6. Then click OK, and the missing numbers have been listed into a new worksheet. See screenshot:


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