In Excel: select the cells, then grab the small green square at the bottom-right corner — the fill handle — and drag it down or across to copy values or extend a series; double-click it to fill down to the end of the adjacent data.
On this page7
Enter enough values to define the pattern (one cell to copy, two cells for a series).
Select those cells so the fill handle appears at the bottom-right.
Drag the handle down or across, or double-click it to fill down to the end of the adjacent data.
Click the AutoFill Options button to pick Copy Cells, Fill Series, or Fill Formatting Only.
Use Ctrl+D to fill down or Ctrl+R to fill right without dragging.
What this does
The fill handle is the small green square at the bottom-right corner of a selection. Dragging it copies the selected cells or extends a detected series, and double-clicking it fills down to the bottom of the data in the neighboring column. AutoFill reads the pattern in what you selected — 1, 2, 3… or Jan, Feb… — and continues it. Ctrl+D fills the selection down from the cell above; Ctrl+R fills right. After a drag, the AutoFill Options button appears so you can switch between Copy Cells, Fill Series, and Fill Formatting Only. The same idea underpins a lot of everyday Excel work, so the few minutes spent getting it right here pay back across every sheet you build afterwards. Treat it as a pattern, not a one-off, and it stops being something you look up and starts being something you reach for. Treat “auto fill numbers in excel” as a small repeatable workflow rather than a one-off click you hope to remember next time. Use a small test block before the live file, so any surprise in the affected cells shows up while it is still harmless. When this is a ribbon command, the selection matters more than the button: confirm the range, apply the command, then spot-check the output before saving. That turns a calculation you can defend to a CFO or an auditor into a method you can reuse, explain, and defend when the workbook leaves your screen.
A worked example
Type 1 in A1 and 2 in A2, select both cells, then drag the fill handle down — Excel reads the step of 1 and continues 3, 4, 5… If you instead dragged a single cell containing 1, it would copy 1, 1, 1 until you switch to Fill Series. Dragging the fill handle is the fastest way to repeat a value or build a numbered or dated series down a column without typing each cell. If this is something you do often, add the command to the Quick Access Toolbar (right-click it on the ribbon and choose Add to Quick Access Toolbar) or learn its shortcut, so next time it is one click instead of a hunt through the menus.
In Google Sheets
This is a command rather than a formula, so there is no syntax to carry over. Google Sheets arranges its commands in menus across the top instead of a ribbon, names some of them differently and does not have every Excel command — look for the equivalent in the Sheets menus or its help before assuming the steps match. Keep this page bookmarked for the next time the same question comes up. Better still, repeat the steps once in your own workbook — doing it yourself is what turns a copied answer into something you remember. Here is the takeaway for “auto fill numbers in excel”: follow the steps at the top, check the result on the sheet itself, and keep undo in mind while you experiment. Done once deliberately, it becomes something you do from memory in Excel rather than something you search for again.
Common mistakes
- Dragging one cell and expecting a series — a single cell copies; give it two cells to set the step.
- Double-clicking the handle when the adjacent column has gaps, so the fill stops early.
- Ignoring the AutoFill Options button when Excel guessed copy instead of series.
- Holding the wrong corner — the move pointer (four arrows) drags the cell, not the fill handle.
Frequently asked questions
Where is the fill handle?
It is the small green square at the bottom-right corner of the selected cell or range.
How do I fill down without dragging?
Select the range and press Ctrl+D to fill down, or Ctrl+R to fill right.
Why does my drag copy instead of counting up?
A single starting cell copies. Enter two values first, or open AutoFill Options and choose Fill Series.
Other ways people ask this
This is also commonly searched as “excel auto number fill” and “auto fill numbers in excel”. They describe the identical operation, so you are in the right place no matter how you phrased it.
Why do people search for this in so many different ways?
Because the same task has many names. “excel auto number fill”, “auto fill numbers in excel” all point at the one operation explained on this page, which is why they all lead here.