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 “autofill a column 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 columns 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 layout choice that keeps the sheet readable and sortable 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. When the result is not what you expected, undo straight away rather than repairing it by hand — undo restores the sheet exactly, while manual fixes tend to leave small inconsistencies behind that surface later.
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. The aim was to get you unstuck fast and leave you a little more capable than a copy-paste would. The answer is at the top and the detail above shows why it holds — so the next time a colleague asks, you can answer without reaching for search. The short version of “autofill a column in excel”: the answer is at the top of this page, and the sections above explain why each step matters, so a variation of the problem does not stump you. Try it once on a copy of a real file and the steps stick far better than re-reading them.
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
On the way here you may have searched this as “how to autofill columns in excel”, “excel autofill column” and “autofill columns in excel” — it is all the same task, and this page is the single, complete answer to it.
Why do people search for this in so many different ways?
Because the same task has many names. “how to autofill columns in excel”, “excel autofill column”, “autofill columns in excel” all point at the one operation explained on this page, which is why they all lead here.