How to Quickly Insert Unique Sequence Numbers in Excel

Whether you’re managing data, creating reports, or organizing lists — inserting unique serial numbers is a common and essential task in Excel. Below are 5 easy methods to do it effectively.

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✅ 1. Fill Handle (Drag Method) – Best for Short Lists

Steps:

1. In A1, type 1; in A2, type 2.
2. Select both cells.
3. Drag the fill handle (bottom-right corner) down as far as needed.

👉 Excel auto-extends the sequence: 3, 4, 5...

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✅ 2. Fill Series (For Larger Lists)

Steps:

1. In A1, type 1.
2. Go to Home > Editing Group > Fill > Series.
3. Choose:
   • Columns (or Rows)
   • Step Value: 1
   • Stop Value: (e.g., 1000)
4. Click OK.

🚀 Instantly generates hundreds or thousands of sequence numbers!

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✅ 3. ROW() Formula (Dynamic Numbering)

Use this when data is added/deleted frequently.

Formula Example in A2:
=ROW()-1 (if your data starts at row 2)

Customize by adjusting based on your starting row.
e.g., =ROW()-4 if starting from row 5.

📌 Benefits:

• Auto-adjusts when you add/remove rows
• Works well with filters/sorting

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✅ 4. Power Query (Advanced Users)

If you’re importing data or cleaning up large datasets:

1. Load data into Power Query.
2. Go to Add Column > Index Column > From 1.
3. Click Close & Load.

💡 Perfect for automated data workflows.

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✅ 5. Using VBA (For Automation Lovers)

If you frequently need sequence numbers, use this macro:

vbaCopyEditSub AddSerialNumbers()
    Dim i As Long
    Dim lastRow As Long
    
    lastRow = Cells(Rows.Count, "A").End(xlUp).Row
    
    For i = 2 To lastRow
        Cells(i, 1).Value = i - 1
    Next i
End Sub

📌 How to Use:

1. Press Alt + F11 to open the VBA Editor.
2. Insert a new Module.
3. Paste the code.
4. Run the macro.

⚙️ It will insert serial numbers in Column A, starting from row 2.

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