I found only estimates: http://www.worldwidewebsize.com/ http://www.worldwidewebsize.com/ 40-50 billion pages. From the site: "The size of the index of a searc

I found only estimates: http://www.worldwidewebsize.com/ http://www.worldwidewebsize.com/ 40-50 billion pages. From the site: "The size of the index of a search engine is estimated on the basis of a method that combines word frequencies obtained in a large offline text collection (corpus), and search counts returned by the engines. Each day 50 words are sent to all four search engines. The number of webpages found for these words are recorded; with their relative frequencies in the background corpus, multiple extrapolated estimations are made of the size of the engine's index, which are subsequently averaged. The 50 words have been selected evenly across logarithmic frequency intervals (see Zipf's Law). The background corpus contains more than 1 million webpages from DMOZ, and can be considered a representative sample of the World Wide Web."