Too Many Formats when Sorting

Debi is running into a problem when she tries to sort her worksheet. Instead of doing the sort, she gets a message that says "Too Many Different Cell Formats."

According to sources at Microsoft, this error occurs when your workbook gets close to exceeding one of the built-in limitations of Excel. A workbook can contain only about 4,000 "custom formats."

Custom formats are unique combinations of formatting attributes, applied to cells. For instance, let's say that you have two cells, both formatted for 10-pt. Arial type. Both use the same number format, and neither of them have borders applied. If you change the font size of one of the cells to 11-pt., then you now have two unique custom formats. If you copy the format of the 11-pt. cell to a third cell, you still have only two custom formats. But if you add a border to one of the 11-pt. cells, you now have three custom formats.

Basically, a custom format is any unique combination of things like typefaces, font sizes, colors, alignment, borders, or other cell attributes. If you have a workbook that has, say, 40 complex worksheets, then it is very possible to get close to the 4,000 custom-format limit.

There is only one way to correct the situation: Reduce the number of custom formats. Select a large block of cells in the workbook, and then choose Edit | Clear | Formats. If Excel won't let you do this even (perhaps you have put the workbook into an unstable state by having way too many custom formats), then you should copy the contents of your worksheets, one by one, to a new workbook. Make sure you use Edit | Paste Special | Formulas to do the pasting, so that your formulas are preserved and you don't copy formatting.

For further information on this topic, refer to the following Microsoft Knowledge Base article:

http://support.microsoft.com/?kbid=213904

It is unclear whether this limitation applies to Excel 2007, as a lot of previous limits were increased. Even so, it is a good idea to decrease the complexity of your workbooks so that there are fewer custom formats rather than more. This will make your workbook load and display faster, and it will ensure that it is compatible with older versions of Excel.