How to Fill Formula Down in Excel

What this does

Copying a formula repeats the logic while Excel adjusts relative cell references. A formula in C2 such as =A2*B2 becomes =A3*B3 when filled down to C3. Absolute references with dollar signs stay fixed, mixed references lock only the row or column, and Paste Special ▸ Formulas copies the formula without copying formatting. Before you run it on a workbook other people depend on, try it on a copy or a few rows first. Undo only reaches back through the current session, so a quick trial run is the cheapest way to see exactly what will change before the file is saved and shared. Treat “fill formula down 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 formula 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

C2 contains =A2*B2 for quantity times price. Drag the fill handle from C2 to C20 and Excel writes =A3*B3, =A4*B4 and so on. If every row must multiply by a tax rate in F1, write =A2*B2*$F$1 before filling down so the F1 reference does not move. Fast, correct formula copying is core spreadsheet work. It turns one tested row into a reliable model and prevents subtle reference drift across hundreds of rows. 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. 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. If you take one thing from this page on “fill formula down in excel”, make it the order of checks rather than the individual clicks: confirm what is selected, apply the step, and look at the result before moving on. That small routine is what keeps Excel work predictable when the same task comes back in a slightly different workbook.

Common mistakes

• Forgetting absolute references, so lookup tables, rates or assumptions shift while copying.
• Copying formatting along with formulas and accidentally changing the report style.
• Filling into rows with gaps, where double-clicking the fill handle may stop early.
• Pasting formulas over existing manual overrides without checking dependencies.

Frequently asked questions