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ARRAYFORMULA in Google Sheets: fill a full column with one formula

Replace copied formulas with one array formula and handle blank rows cleanly.

JosephineWritten by JosephinePublished June 20, 2026Last updated July 24, 202610 min
ARRAYFORMULA in Google Sheets — SheetSteps
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Wrap a row calculation in ARRAYFORMULA, switch single-cell references to column ranges, and return blank when the input row is blank.

Before you calculate a full column from one formula, set up a clean source range and one result you can check by hand. That gives you a known answer before the sheet grows.

This article shows how to calculate a full column from one formula. The sample sheet uses ordinary rows so you can copy the method into an existing file without rebuilding everything.

ARRAYFORMULA in Google Sheets spreadsheet used in this article
A working sheet built for this article. The numbers are sample data.
01
INSTRUCTIONS

ARRAYFORMULA in Google Sheets: fill a full column with one formula

  1. 01
    Make a safe copy

    Duplicate the source tab or file before changing formulas, ranges or formatting.

  2. 02
    Set up the source rows

    Add the fields needed to calculate a full column from one formula. Keep one record on each row and one field in each column.

  3. 03
    Add the method

    Enter =ARRAYFORMULA(IF(A2:A="","",B2:B*C2:C)) in a test cell and check its first result.

  4. 04
    Check a known case

    Pick one row whose answer you already know and compare it with the sheet result.

  5. 05
    Test the awkward rows

    Check blanks, zeros, repeated entries and one row that should not match.

  6. 06
    Apply it to the full range

    Copy the formula or rule only after the sample cases return the expected result.

02
FORMULAS

Set up the sheet for ARRAYFORMULA in Google Sheets

Keep the source table rectangular. A single header row, no merged cells and consistent cell types make the work much easier to check.

Place settings, fixed rates or allowed labels on a separate tab. Name them clearly so another person can read the file without tracing every cell.

  • Leave the output column empty below the formula
  • Return blank for blank source rows
  • Use matching range starts
  • Do not place manual entries inside the result range
03
FORMULAS

Check the first result before copying it

A result that looks plausible can still be wrong. Work through one row manually, compare it with the Sheet and check every referenced cell.

Next, test a blank row and an unusual row. These two checks catch many range, type and copied-reference mistakes before they spread.

fx=ARRAYFORMULA(IF(A2:A="","",B2:B*C2:C))
04
FORMULAS

Keep the file reliable as new rows arrive

Leave input columns visually separate from calculated columns. Protect formulas when several people edit the same file, and keep dropdown lists or settings outside the main table.

Add a short check near the result: row count, unmatched count, last refresh time or a manual spot check. The right check depends on the job, but it should make a bad update easy to notice.

05
COMMON QUESTIONS

Questions people ask

What does ARRAYFORMULA do?＋

It lets one formula return results for many rows or columns.

Why does ARRAYFORMULA say the result was not expanded?＋

A cell inside the intended output range already contains data. Clear that cell or move the formula.

Does ARRAYFORMULA work with every function?＋

No. Some functions already return arrays and some do not accept array inputs in the expected way.

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