[excel] Format cell color based on value in another sheet and cell

Here's how I did it in Excel 2003 using conditional formatting.

To apply conditional formatting to Sheet1 using values from Sheet2, you need to mirror the values into Sheet1.

Creating a mirror of Sheet2, column B in Sheet 1

  1. Go to Sheet1.
  2. Insert a new column by right-clicking column A's header and selecting "Insert".
  3. Enter the following formula into A1:

    =IF(ISBLANK(Sheet2!B1),"",Sheet2!B1)

  4. Copy A1 by right-clicking it and selecting "Copy".
  5. Paste the formula into column A by right-clicking its header and selecting "Paste".

Sheet1, column A should now exactly mirror the values in Sheet2, column B.

(Note: if you don't like it in column A, it works just as well to have it in column Z or anywhere else.)

Applying the conditional formatting

  1. Stay on Sheet1.
  2. Select column B by left-clicking its header.
  3. Select the menu item Format > Conditional Formatting...
  4. Change Condition 1 to "Formula is" and enter this formula:

    =MATCH(B1,$A:$A,0)

  5. Click the Format... button and select a green background.

You should now see the green background applied to the matching cells in Sheet1.

Hiding the mirror column

  1. Stay on Sheet1.
  2. Right-click the header on column A and select "Hide".

This should automatically update Sheet1 whenever anything in Sheet2 is changed.