Google Sheets conditional formatting not working: 8 checks
Repair rule ranges, custom formulas, date checks and rule order when cells do not format.
Written by PhilisPublished June 11, 2026Last updated July 27, 202612 min
Check Apply to range first, then inspect whether the custom formula is written for the top-left cell of that range. Review rule order and cell data types.
Before you repair a conditional formatting rule, 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 repair a conditional formatting rule. The sample sheet uses ordinary rows so you can copy the method into an existing file without rebuilding everything.
Google Sheets conditional formatting not working: 8 checks
- 01Make a safe copy
Duplicate the source tab or file before changing formulas, ranges or formatting.
- 02Set up the source rows
Add the fields needed to repair a conditional formatting rule. Keep one record on each row and one field in each column.
- 03Add the method
Enter =AND($D2<>"Done",$C2<TODAY()) in a test cell and check its first result.
- 04Check a known case
Pick one row whose answer you already know and compare it with the sheet result.
- 05Test the awkward rows
Check blanks, zeros, repeated entries and one row that should not match.
- 06Apply it to the full range
Copy the formula or rule only after the sample cases return the expected result.
Set up the sheet for Fix conditional formatting
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.
- Check Apply to range
- Write the formula for the first row
- Lock only intended columns
- Review rule order
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.
=AND($D2<>"Done",$C2<TODAY())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.
Questions people ask
Why does conditional formatting apply to the wrong row?＋
The custom formula reference is offset from the first row of the Apply to range.
Why does a date rule fail?＋
The cells may contain date-looking text. Convert them to real dates.
Can one rule override another?＋
Yes. Review overlapping rules and their order in the conditional format panel.
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