You won't find that info, and it's very much a moving target.
You can take the published amount of pages, for example Google, 4,285,199,774 web pages, and multiply that by whatever number you feel would best represent the average page size.
However, even if you did know the average size of web pages, which is somewhere between 10 and 30 K, a database size isn't just related to its total content, but also to the structure of its indexes, and other meta data, for example PageRank and semantic data.
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