The total redactions in the Mueller report amount to between 6% and 12% of the 448-page document

Of the 448 pages that comprise the document, roughly 6% of the text was redacted, according to the investigative journalism nonprofit ProPublica. The Wall Street Journal reports about 12.4% was blacked out.
ProPublica's reading looks at all hidden text inside the page margins. For its part, The Journal determined about 2,050 of the 16,500 lines in the report are redacted, or roughly 12.4%.
Attorney General William Barr selected the redactions. They include information that went before a grand jury but did not result in criminal charges, details that could compromise intelligence sources and methods, information pertaining to ongoing criminal investigations, and any details that could hurt the personal privacy or reputation of any third parties.
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The total redactions in the special counsel's final report on the Russia investigation comprise a relatively small portion of the 448-page document.

According to an estimate from the investigative journalism nonprofit ProPublica , 6% of the report meaning all blacked-out text within the page margins is redacted. The Wall Street Journal's reading says that of the 16,500 lines of the Mueller report's 2,050 lines, or approximately 12.4% of the document , are redacted.

Attorney General William Barr selected the redactions, most of which include information that is either pertinent to ongoing criminal investigations, details examined by a grand jury that were not pursued further, and information that could compromise the privacy or reputation of third parties.

The Mueller report found the Trump campaign engaged in multiple contacts with Russian operatives during the 2016 US presidential election and that Russia did interfere in the 2016 election, but did not find enough evidence of conspiracy between the Trump campaign and Russia. Mueller's team also found that Trump exerted effort to hinder the special counsel's investigation. Ultimately, Mueller and his prosecutors chose not to pursue obstruction of justice charges against Trump, citing a number of legal hurdles.

Mueller makes clear that his findings do not exonerate Trump on the matter of obstruction of justice, contradicting the president and his allies on that argument. There are another 14 criminal matters Mueller referred to other prosecutors . Only two of them are known to the public.

Barr, who was appointed by President Donald Trump, declined to prosecute on the the case of obstruction saying there was not enough evidence. He has been accused of amplifying Mueller's decision not to pursue obstruction charges. Top Democrats have said they will request the full, unredacted Mueller report, plus the underlying documents connected to the investigation.