{"id":9514,"date":"2022-05-02T17:32:36","date_gmt":"2022-05-02T17:32:36","guid":{"rendered":"https:\/\/officetuts.net\/excel\/?p=9514"},"modified":"2024-03-26T15:23:49","modified_gmt":"2024-03-26T15:23:49","slug":"find-missing-number-in-sequence","status":"publish","type":"post","link":"https:\/\/officetuts.net\/excel\/examples\/find-missing-number-in-sequence\/","title":{"rendered":"Find Missing Number in Sequence in Excel"},"content":{"rendered":"\n<p>Sometimes you may want to identify missing numbers in a sequence in Excel such as product ID numbers. One way would be to manually scroll through the dataset and identify the missing numbers. However, this would be quite a tedious, time-consuming, and error-prone task especially if you are working with large datasets.<\/p>\n\n\n\n<p>In this tutorial we will explain two methods that can be used to find missing numbers in sequence in Excel more easily and efficiently:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-1-use-an-excel-formula\">Method 1 \u2013 Use an Excel formula<\/h2>\n\n\n\n<p>We can use an Excel formula that combines the <strong>SMALL<\/strong>, <strong>IF<\/strong>, <strong>COUNTIF<\/strong>, and <strong>ROW<\/strong> functions.<\/p>\n\n\n\n<p>We will use the following dataset to demonstrate how this method can be used:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"146\" height=\"146\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/dataset-missing-numbers.png\" alt=\"\" class=\"wp-image-9517\"\/><\/figure>\n\n\n\n<p><strong>Step 1<\/strong> &#8211; Enter the formula:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL(IF(COUNTIF($A$1:$A$6,ROW($21:$32))=0,ROW($21:$32),\"\"),ROW(A1))<\/code><\/pre>\n\n\n\n<p>in cell <strong>C1<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"776\" height=\"234\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-combined-functions.png\" alt=\"\" class=\"wp-image-9518\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-combined-functions.png 776w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-combined-functions-300x90.png 300w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-combined-functions-768x232.png 768w\" sizes=\"(max-width: 776px) 100vw, 776px\" \/><\/figure>\n\n\n\n<p><strong>Step 2<\/strong> \u2013 The formula is an <strong>array formula<\/strong> so enter it by pressing <strong>CTRL + SHIFT + ENTER<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"229\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/enter-array-formula.png\" alt=\"\" class=\"wp-image-9519\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/enter-array-formula.png 781w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/enter-array-formula-300x88.png 300w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/enter-array-formula-768x225.png 768w\" sizes=\"(max-width: 781px) 100vw, 781px\" \/><\/figure>\n\n\n\n<p><strong>Step 3<\/strong> \u2013 Using the <strong>Fill Handle<\/strong>, drag the formula down to cell <strong>C6<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"781\" height=\"250\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-fill-down.png\" alt=\"\" class=\"wp-image-9523\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-fill-down.png 781w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-fill-down-300x96.png 300w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/formula-fill-down-768x246.png 768w\" sizes=\"(max-width: 781px) 100vw, 781px\" \/><\/figure>\n\n\n\n<p>All the missing numbers in the sequence will be generated.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"the-logic-of-the-formula\">The logic of the Formula<\/h3>\n\n\n\n<p>The formula counts the numbers in the range <strong>A1:A6 <\/strong>that match the numbers generated by the <strong>ROW($21:$32) <\/strong>which are {21;22;23;24;25;26;27;28;29;30;31;32}. If they are missing, that is, =0, it gives a list of them. If they are not missing, that is, not =0, it returns an empty string (&#8220;&#8221;), and then returns the first smallest missing value in the current cell.<\/p>\n\n\n\n<p>The <strong>ROW(A1) <\/strong>part of the formula is relative meaning as it is copied down the column <strong>C<\/strong>, it becomes <strong>ROW(A2) <\/strong>which =2, and returns the second smallest value<strong>, ROW(A3) <\/strong>which =3 and returns the third smallest value, and so on.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"the-functions-used-in-the-formula\">The functions used in the formula<\/h3>\n\n\n\n<p><strong>SMALL<\/strong> function<\/p>\n\n\n\n<p>It returns the smallest n<sup>th <\/sup>value in a range, in the form of the first smallest value, the second smallest value, the third smallest value, and so on.<\/p>\n\n\n\n<p><strong>IF<\/strong> function<\/p>\n\n\n\n<p>It tests for counts of 0. If it is TRUE, that is 0, it means the number is missing and so it returns the corresponding value from the array generated by <strong>ROW(21:32)<\/strong>.<\/p>\n\n\n\n<p><strong>COUNTIF<\/strong> function<\/p>\n\n\n\n<p>It counts the numbers in the range <strong>A1:A6<\/strong> that match the range of values returned by the <strong>ROW<\/strong> function.<\/p>\n\n\n\n<p><strong>ROW<\/strong> function<\/p>\n\n\n\n<p>It returns the row number of a cell reference.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"stepping-through-the-formula\">Stepping through the formula<\/h3>\n\n\n\n<p>We will step through the formula:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL(IF(COUNTIF($A$1:$A$6,ROW($21:$32))=0,ROW($21:$32),\"\"),ROW(A1)) <\/code><\/pre>\n\n\n\n<p>to see how it works.<\/p>\n\n\n\n<p><strong>Step 1<\/strong> &#8211; The values in range <strong>A1:A6<\/strong> and <strong>ROW(21:32)<\/strong> are returned:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL(IF(COUNTIF({21;27;25;28;30;32},ROW({21;22;23;24;25;26;27;28;29;30;31;32}))=0,ROW($21:$32),\"\"),ROW(A1))<\/code><\/pre>\n\n\n\n<p><strong>Step 2<\/strong> \u2013 The <strong>COUNTIF<\/strong> function returns the counts of values in the array returned by <strong>ROW(21:32), <\/strong>that are found in the range <strong>A1:A6<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> =SMALL(IF({1;0;0;0;1;0;1;1;0;1;0;1})=0,ROW($21:$32),\"\"),ROW(A1))<\/code><\/pre>\n\n\n\n<p>This means that there is 1 count of 21, 0 count of 22, and so on in the range <strong>A1:A6<\/strong>.<\/p>\n\n\n\n<p><strong>Step 3<\/strong> \u2013 The <strong>IF<\/strong> function returns TRUE if the number in the resultant array =0 and FALSE if it doesn\u2019t:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL(IF({FALSE;TRUE;TRUE;TRUE;FALSE;TRUE;FALSE;FALSE;TRUE;FALSE;TRUE;FALSE},{21;22;23;24;25;26;27;28;29;30;31;32),\"\"),ROW(A1))<\/code><\/pre>\n\n\n\n<p><strong>Step 4<\/strong> \u2013 The <strong>IF <\/strong>function evaluates the &nbsp;<strong>value_if_true<\/strong> and <strong>value_if_false<\/strong> values:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL({\"\";22;23;24;\"\";26;\"\";\"\";29;\"\";31;\"\"},ROW(A1))<\/code><\/pre>\n\n\n\n<p>We now have the list of missing numbers.<\/p>\n\n\n\n<p><strong>Step 5<\/strong> \u2013 The <strong>ROW(A1) <\/strong>function evaluates to 1:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>=SMALL({\"\";22;23;24;\"\";26;\"\";\"\";29;\"\";31;\"\"},1)<\/code><\/pre>\n\n\n\n<p><strong>Step 6<\/strong> \u2013 The <strong>SMALL<\/strong> function returns the first smallest value in the array which is =22.<\/p>\n\n\n\n<p>The next smallest value is =23 and so on.<\/p>\n\n\n\n<p>The Formula method generally works well but it has the limitation of working only with whole numbers that are greater than 0.<\/p>\n\n\n\n<p>To overcome this limitation we have to turn to the next method of using Excel VBA code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"method-2-use-excel-vba-code\">Method 2 \u2013 Use Excel VBA Code<\/h2>\n\n\n\n<p>We will use the following dataset to demonstrate how VBA code can be used to find missing numbers in sequence in Excel:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"158\" height=\"136\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/dataset-vba-code.png\" alt=\"\" class=\"wp-image-9524\"\/><\/figure>\n\n\n\n<p><strong>Step 1<\/strong> \u2013 Press <strong>Alt + F11<\/strong> to open the Visual Basic Editor (VBE). Alternatively, you can click <strong>Developer &gt;&gt; Visual Basic<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"728\" height=\"123\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/developer-visual-basic.png\" alt=\"\" class=\"wp-image-9525\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/developer-visual-basic.png 728w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/developer-visual-basic-300x51.png 300w\" sizes=\"(max-width: 728px) 100vw, 728px\" \/><\/figure>\n\n\n\n<p><strong>Step 2<\/strong> \u2013 In the <strong>VBAProject<\/strong> window right click your workbook and click <strong>Insert &gt;&gt; Module:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"519\" height=\"466\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/insert-module.png\" alt=\"\" class=\"wp-image-9526\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/insert-module.png 519w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/insert-module-300x269.png 300w\" sizes=\"(max-width: 519px) 100vw, 519px\" \/><\/figure>\n\n\n\n<p><strong>Step 3<\/strong> \u2013 Enter the following code in the new module. Note that comments that are not executable are preceded by an apostrophe (\u2018). The comments explain what the code is doing:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Sub FindMissingNumbers()\n    Dim InputRange  As Range, OutputRange As Range, NumberFound As Range\n    Dim LowerNum    As Double, UpperNum As Double, count_i As Double, count_j As Double\n    Dim NumRows     As Long, NumColumns As Long\n    Dim Horizontal  As Boolean\n    'Default is to output the results into a column\n    Horizontal = FALSE\n    On Error GoTo ErrorHandler\n    'Ask for the range to check\n    Set InputRange = Application.InputBox(Prompt:=\"Select a range To check :\", _\n    Title:=\"Find missing numbers\", _\n    Default:=Selection.Address, Type:=8)\n    'Find the lowest and highest numbers in the range\/sequence\n    LowerNum = WorksheetFunction.Min(InputRange)\n    UpperNum = WorksheetFunction.Max(InputRange)\n    'Ask where the output is to go\n    Set OutputRange = Application.InputBox(Prompt:=\"Select where you want the result To go :\", _\n    Title:=\"Select cell For Results\", _\n    Default:=Selection.Address, Type:=8)\n    'Check the number of rows and columns in the output range\n    NumRows = OutputRange.Rows.Count\n    NumColumns = OutputRange.Columns.Count\n    'If there are more columns selected than rows, the output is to go horizontally\n    If NumRows &lt; NumColumns Then\n        Horizontal = TRUE\n        'Reset the number of rows to 1 so that output is into the first row\n        NumRows = 1\n    Else\n        'Reset the number of columns to 1 so that output is into the first column\n        NumColumns = 1\n    End If\n    'Initalise counter and loop through sequence from lowest to highest value\n    count_j = 1\n    For count_i = LowerNum To UpperNum\n        'Search for the current value (count_i)\n        Set NumberFound = InputRange.Find(count_i, LookIn:=xlValues, LookAt:=xlWhole)\n        'If it's not found, we have a missing number in the sequence\n        If NumberFound Is Nothing Then\n            'Output the missing number to the sheet\n            If Horizontal Then\n                OutputRange.Cells(NumRows, count_j).Value = count_i\n                count_j = count_j + 1\n            Else\n                OutputRange.Cells(count_j, NumColumns).Value = count_i\n                count_j = count_j + 1\n            End If\n        End If\n    Next count_i\n    Exit Sub\n    ErrorHandler:\n    If InputRange Is Nothing Then\n        MsgBox \"ERROR : No input range specified.\"\n        Exit Sub\n    End If\n    If OutputRange Is Nothing Then\n        MsgBox \"ERROR : No output cell specified.\"\n        Exit Sub\n    End If\n    MsgBox \"An Error has occurred. The macro will end.\"\nEnd Sub\n<\/code><\/pre>\n\n\n\n<p><strong>Step 4 \u2013 <\/strong>Click the <strong>Save<\/strong> button:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"704\" height=\"418\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/save-button.png\" alt=\"\" class=\"wp-image-9527\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/save-button.png 704w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/save-button-300x178.png 300w\" sizes=\"(max-width: 704px) 100vw, 704px\" \/><\/figure>\n\n\n\n<p><strong>Step 5 \u2013 <\/strong>Save the workbook as a <strong>.xlsm<\/strong> file:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"538\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-enabled-workbook.png\" alt=\"\" class=\"wp-image-9528\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-enabled-workbook.png 643w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-enabled-workbook-300x251.png 300w\" sizes=\"(max-width: 643px) 100vw, 643px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"code-explanation\">Code Explanation<\/h3>\n\n\n\n<p>The code uses VBA&#8217;s <strong>FIND<\/strong> method on the input range you specify to look for the missing numbers in sequence.<\/p>\n\n\n\n<p>When the code is executed, Excel prompts asks for the input range in which to search for missing numbers. Use the mouse to select the range.<\/p>\n\n\n\n<p>You will then be prompted for the output range where the missing numbers will be listed.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"code-execution\">Code Execution<\/h3>\n\n\n\n<p><strong>Step 1<\/strong> \u2013 Switch to the current workbook by pressing <strong>Alt + F11. <\/strong>Alternatively, click on the <strong>View Microsoft Excel <\/strong>button:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"544\" height=\"267\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/view-microsoft-excel.png\" alt=\"\" class=\"wp-image-9529\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/view-microsoft-excel.png 544w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/view-microsoft-excel-300x147.png 300w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/view-microsoft-excel-542x267.png 542w\" sizes=\"(max-width: 544px) 100vw, 544px\" \/><\/figure>\n\n\n\n<p><strong>Step 2<\/strong> \u2013 Press <strong>Alt + F8<\/strong> to open the <strong>Macro<\/strong> dialog box and select the <strong>FindMissingNumbers<\/strong> macro and click on the <strong>Run<\/strong> button:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"448\" height=\"369\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-select.png\" alt=\"\" class=\"wp-image-9530\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-select.png 448w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/macro-select-300x247.png 300w\" sizes=\"(max-width: 448px) 100vw, 448px\" \/><\/figure>\n\n\n\n<p><strong>Step 3<\/strong> \u2013 In the <strong>Find missing numbers<\/strong> dialog box, enter the input range by selecting using the mouse and then click <strong>OK<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"280\" height=\"122\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/select-range-to-check.png\" alt=\"\" class=\"wp-image-9531\"\/><\/figure>\n\n\n\n<p><strong>Step 4<\/strong> \u2013 Enter the output range and click <strong>OK<\/strong>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"280\" height=\"122\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/select-cells-for-results.png\" alt=\"\" class=\"wp-image-9532\"\/><\/figure>\n\n\n\n<p>The missing numbers will appear in the output range you selected:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"301\" height=\"401\" src=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/output-results.png\" alt=\"\" class=\"wp-image-9533\" srcset=\"https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/output-results.png 301w, https:\/\/officetuts.net\/excel\/wp-content\/uploads\/sites\/2\/2022\/05\/output-results-225x300.png 225w\" sizes=\"(max-width: 301px) 100vw, 301px\" \/><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sometimes you may want to identify missing numbers in a sequence in Excel such as product ID numbers. One way would be to&#8230;<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[190],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Find Missing Number in Sequence in Excel<\/title>\n<meta name=\"description\" content=\"Learn how to easily find missing numbers in sequence in Excel using formulas. Save time and avoid errors with large datasets. 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Save time and avoid errors with large datasets. 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