What was checked
Fact-check log
Every numbered claim on this site was matched, by regular expression, against a cached excerpt of the source named beside it. The excerpts were saved on 15 November 2026.
Where two good sources, or two articles from the same publisher, disagree, both wordings are shown. Nothing in those notes is treated as a trivia answer.
How tall is the Great Pyramid now?
Britannica’s Pyramids of Giza article says 451.4 feet (138 metres). The same publisher’s Great Pyramid article says 449 feet (137 metres). Both figures are current heights after the loss of almost all the outer casing. This site keeps both in view and does not pick a winner.
How tall was it originally?
The Giza article gives 481.4 feet (147 metres). The Great Pyramid article says about 482 feet (147 metres). The metre figure is the same in both; the foot figures differ slightly. A later millimetre survey figure is sometimes quoted elsewhere; it is not used here because it was not found in the cached AERA excerpt used for this site.
When was the 4th dynasty?
Britannica’s Giza article uses c. 2575–c. 2465 BCE. Its Great Pyramid article uses c. 2543–c. 2436 BCE. Both are the same publisher’s ranges for the same dynasty. The dates are kept side by side.
How many people built it?
Herodotus, as reported by Britannica, said 100,000 men and 20 years, a figure Britannica calls believable if the work was mainly seasonal. Late twentieth-century archaeology, in the same article, points to a more limited permanent workforce, perhaps as few as 20,000 plus bakers, physicians, priests and other support. Both accounts stay on the page.
How long is each side at the base?
Britannica averages the Great Pyramid’s sides at 755.75 feet (230 metres). Glen Dash, publishing the 1984–85 Lehner–Goodman survey in AERAGRAM 13.2, gives a mean casing length of 230.329 metres for the four sides. The figures agree at the metre; the survey is more precise, and Dash notes that the monument no longer has corners or well-defined edges.
Britannica’s standalone Great Pyramid page also carries AI-generated “Top Questions” boxes, which the page itself warns can make mistakes. Those boxes were not used as checks. Only the article prose was.
A later millimetre figure for the original height is sometimes quoted from the Giza Plateau survey. It is not used on this site, because that exact figure was not found in the cached AERAGRAM 13.2 excerpt. The survey is cited for the 1984–85 measurement of the stripped base, and for Dash’s mean casing length of 230.329 metres.
The full source list is on the sources page.