Hi,
This is what I found -
MOSS 2007:
Recommended number of columns(not specifically Calculated Type of columns) in a list/document library sharepoint 2007 -
2,000 per document library
4,096 per list
Sharepoint 2010:
In sharepoint 2010, the limit( of type Threshold) on the number of calculated columns in the list/document library is
48. The number can be modified but the modification is not recommended
to avoid performance degradation.
Hope this helps..
Regards,
Priyanka