How the Egyptian Pyramids Were Built: Engineering and Workforce

The Great Pyramid at Giza, built for the pharaoh Khufu, required an estimated 2.3 million stone blocks averaging about 2.5 tons each, with some lower-course stones reaching roughly 10 tons, according to figures drawn from a 2025 study in the journal npj Heritage Science and reported by SpaceDaily. Completing it in about 20 years meant setting a block in place roughly every one to three minutes of a working day. Three separate discoveries made over the past four decades — a workers' settlement, a quarry ramp and a boatman's diary — are the main evidence archaeologists use to explain how this was done.

Who built the pyramids: organized crews, not slave armies

The idea that enslaved people built the pyramids traces back to the Greek historian Herodotus, writing around 2,000 years after the fact, who described a workforce of 100,000. Excavations led by archaeologist Mark Lehner at the Heit el-Ghurab site southeast of the Giza pyramids, first uncovered in 1988 and still studied by Ancient Egypt Research Associates (AERA), tell a different story. According to Harvard Magazine's account of Lehner's work, laborers were organized into named units such as 'Friends of Khufu,' divided into five sub-groups, and housed in barracks-style galleries — a formal grid-plan town of 40 galleries in four blocks, each holding more than 50 people.

Faunal remains examined by zooarchaeologist Richard Redding showed enough cattle bone to feed thousands of people meat regularly, a diet Harvard Magazine describes as indicating privileged rather than enslaved status. A separate workers' cemetery excavated by Zahi Hawass above Lehner's site contained skeletal evidence that the work was physically hazardous. Lehner has argued the system resembled a rotating national labor obligation rather than slavery, comparable to communal service owed to a community project.

A 2025 announcement: inscriptions above the King's Chamber

In June 2025, Hawass described newly documented red-ochre markings found above the King's Chamber inside Khufu's pyramid, reached by climbing about 14 meters and crawling through narrow passages, according to a report in The Jerusalem Post. The markings reportedly name rotating work gangs and tally days worked, echoing similar record-keeping found in a separate papyrus archive discussed below. Hawass's team also pointed to worker graves bearing 21 distinct job titles, including 'overseer of the side of the pyramid,' and estimated that supply records point to roughly 10,000 workers fed daily. These findings were presented in a podcast interview rather than a peer-reviewed publication, so they should be read as a preliminary announcement.

Quarrying and transporting stone along the Nile

In 2013, French archaeologists Pierre Tallet and Gregory Marouard discovered papyrus fragments at Wadi al-Jarf, a Red Sea harbor site, now known as the Diary of Merer — the oldest inscribed papyri found anywhere, dated to around the 26th or 27th year of Khufu's reign. The logbooks, kept by an official named Merer, record a roughly 200-strong crew's daily work ferrying limestone blocks from the Tura quarries across the Nile to Giza. Per the account on Wikipedia's entry for the diary, teams of about 40 boatmen made repeated four-day round trips, loading around 30 blocks of two to three tons each per voyage, with roughly 200 blocks delivered every month. The text even refers to the pyramid by its ancient name, Akhet-Khufu, 'Horizon of Khufu.'

Raising the blocks: ramps, ropes and pulleys

How blocks were lifted into place, rather than simply moved across flat ground, has been harder to document directly. In 2018, a joint mission from the Institut français d'archéologie orientale and the University of Liverpool, led by Yannis Gourdon and Roland Enmarch, reported a well-preserved haulage ramp at the Hatnub alabaster quarry in Egypt's Eastern Desert, dated by tool marks and inscriptions of Khufu to his reign. As described in Scientific American, the ramp was flanked by two staircases riddled with post holes that once held wooden posts; workers hauled sledge-mounted blocks up the incline by lashing ropes around the posts, with some crews pulling from above and others from below. Enmarch called the rope arrangement a 'force multiplier' that sharply cut the effort needed to haul loads up slopes steeper than 20 percent.

Gourdon noted that no comparable system had previously been found anywhere else in Egypt, according to Scientific American's report. The discovery demonstrates that Egyptians of Khufu's era had rope-and-post haulage technology capable of moving multi-ton blocks up steep grades, though the publication notes this offers potential insight into, rather than direct proof of, exactly how blocks were raised up the sides of the much larger Great Pyramid itself.

What the evidence adds up to

• Heit el-Ghurab (Giza workers' village), excavated from 1988 by Mark Lehner and AERA: housing, bakeries and a cemetery pointing to an organized, fed labor force.
• Hatnub quarry ramp, reported in 2018 by an IFAO–University of Liverpool team: a post-hole ramp system showing rope-assisted hauling up steep grades.
• Diary of Merer, found in 2013 at Wadi al-Jarf by Pierre Tallet and Gregory Marouard: a logbook of boat convoys shipping Tura limestone to Giza during Khufu's reign.
• Inscriptions above the King's Chamber, announced by Zahi Hawass in June 2025: markings said to name work gangs and shifts, not yet independently verified in a peer-reviewed study.

No single discovery fully explains every engineering step of pyramid-building, and researchers continue to debate exactly how ramps or levers were configured at the Great Pyramid's upper courses. But taken together, the Giza settlement, the Hatnub ramp and the Wadi al-Jarf papyri point to the same general picture: a seasonal, state-organized, provisioned labor force that quarried, hauled by boat, and raised blocks using rope-and-post leverage systems, rather than slave gangs under the whip.