This number will vary by the type of file and the particular characteristics of that file type. The secret to a good page estimate is the evaluation of the file types included in the set of data. The table below provides an average number of pages per GigaByte and MegaByte for some common document types:
Although the actual number of pages cannot be determined accurately until the data is processed, it is possible to provide a rough estimate. When you don’t know the data types, use an average of 75,000 pages per gigabyte or 73 per megabyte.