About how many stone blocks were used to build the Great Pyramid of Giza?
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Answer
About 2.3 million blocks
To finish within the roughly 20 year reign of the pharaoh Khufu, the builders would have had to set a block in place every two to three minutes of daylight.
How to estimate it
Divide the pyramid's volume by one block. The base is 230 m square and the original height was 146 m. A pyramid's volume is base area × height / 3: 230 × 230 × 146 / 3 = 2.57 million cubic metres. A typical block measures about 1.3 × 1.3 × 0.65 m, or 1.1 cubic metres. 2.57 / 1.1 = 2.3 million. Egyptologists quote about 2,300,000 blocks.
Source: Encyclopaedia Britannica; National Geographic
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