How tall is the Great Pyramid of Giza?

Two heights: 146.6 m as built, 138.5 m today

The Great Pyramid of Giza, the tomb of the Fourth Dynasty pharaoh Khufu (Cheops in Greek), stands about 138.5 m (454 ft) tall today. That is the height of the stepped core and the stones that remain on top. It is the figure this site uses for comparisons, because it is the structure you can actually see and measure now.

When it was finished around 2600 BC, the pyramid was taller. Egyptologists generally give its original height as 146.6 m (481 ft), which equals 280 royal cubits of about 52.4 cm. The roughly 8 m difference comes from two losses. The pyramidion, the capstone that formed the point, disappeared in antiquity. Later, almost all of the fine white limestone casing that once gave the faces a smooth, shining finish was stripped off.

How the original height was worked out

No one can stand on the original apex, because it no longer exists, so the 146.6 m figure has to be reconstructed. The most influential survey is still that of William Matthew Flinders Petrie, who measured the Giza plateau with great care in 1880–82. His published results give:

• a mean base side of 9,068.8 inches (about 230.35 m), with a mean error of only about half an inch;
• a slope angle of 51° 52′ ± 2′, from casing stones still in place near the base;
• an original height of 5,776 ± 7 inches (about 146.71 m), found by projecting those sloping faces up to where they would meet.

Petrie also checked the pyramid's alignment and found that the sides are turned only about 3′ 43″ of arc away from true north on average, less than a tenth of a degree. That accuracy is one reason the pyramid draws so much attention. Whatever method the builders used, probably sightings on stars or the sun, it was extremely precise for a building of this size.

Modern figures agree closely with Petrie. The cubit-based interpretation, a base of 440 cubits and a height of 280 cubits, gives the same slope. Ancient Egyptian builders described this gradient as a seked of 5½ palms of horizontal run for every cubit of rise.

The mast on the summit

Photos show a slim pole rising from the flattened top. It is a surveying mast, first set up in 1874 by the astronomer David Gill to mark where the original apex would have been. It has been replaced several times and is never counted in the pyramid's height. In fact, a man who climbed the pyramid in 2019 was told he had not damaged any antiquity, because the mast is a modern object.

Building it: workforce, logistics and the Diary of Merer

The pyramid was built in roughly two decades during Khufu's reign. Most estimates give about 26 or 27 years. Tradition credits Khufu's vizier Hemiunu with overseeing the project. The core is local limestone quarried on the plateau. The casing came from the finer white limestone of Tura, across the Nile. The granite beams of the King's Chamber were shipped some 800 km downriver from Aswan.

The best direct evidence for how this was organized came to light only in 2013. A French team led by Pierre Tallet and Gregory Marouard found papyri at Wadi al-Jarf, an ancient harbor on the Red Sea coast. Among them is the logbook of an inspector named Merer, the oldest inscribed papyrus known. It records his crew of about forty boatmen ferrying white limestone from Tura to Giza along canals and Nile floodwaters, about 200 blocks a month, in the 26th or 27th year of Khufu's reign. The diary names the pyramid Akhet-Khufu, "Horizon of Khufu". It also mentions Ankhhaf, the king's half-brother, as an official in charge. Tallet argues the stone was meant for the casing, which would put Merer's work in the final stage, when the pyramid was reaching its full height.

The longest-held height record in history

For more than 3,700 years the Great Pyramid was the tallest structure humans had built. No other record comes close to lasting that long. Its rivals at Giza never beat it: the neighboring Pyramid of Khafre is now 136.4 m and was originally slightly shorter.

The pyramid lost the title only in the Middle Ages, to Gothic spires in England. Sources differ on which one came first. Old St Paul's Cathedral in London is often given as the first to pass it, in the early thirteenth century. Lincoln Cathedral is the classic answer: its central tower was topped with a lead-covered timber spire that reputedly reached about 160 m. Lincoln is generally listed as the world's tallest structure from 1311 until the spire blew down in 1548. Historians treat that 160 m figure with some caution, but even the lower estimates put it above the pyramid's original 146.6 m.

The pyramid's height did not change in 1311. What changed was the competition. By the time Lincoln's spire fell, the pyramid had already lost much of its casing and was well below its original height.

Why Khufu's pyramid can look shorter than Khafre's

Many first-time visitors assume the middle pyramid at Giza is the biggest, because in photos and on the plateau it often seems to stand highest. That pyramid belongs to Khafre, Khufu's son. Three facts explain the illusion, and they are a useful reminder that apparent height depends on where you measure from.

• Higher ground. Khafre's pyramid was built on bedrock roughly 10 m higher than Khufu's, so its summit sits higher above the surrounding desert even though the monument itself is shorter.
• A steeper slope. Khafre's faces rise at about 53°, a little steeper than the Great Pyramid's 51.85°. A steeper pyramid with a smaller base looks more pointed and taller from a distance.
• Surviving casing. A cap of the original smooth casing still clings to the top of Khafre's pyramid. It keeps the point sharp, while Khufu's summit is a flat, ragged platform with a mast.

Measured as structures, the order is clear: the Great Pyramid is 138.5 m today against 136.4 m for Khafre's, and it was taller as built too. The third main pyramid, Menkaure's, is far smaller, at well under half the height of either.

Comparisons with other landmarks

At 138.5 m the pyramid is shorter than many modern towers, but its base makes it far bulkier than any of them. Each side is longer than two football fields, and the base covers about 5.3 hectares. Here is how its height compares with other structures in our landmark data. You can also line them up in the 3D comparison tool.

The London Eye comparison is a good one to remember. The wheel's top capsule rises to about the height of today's pyramid summit. Cologne Cathedral, finished in 1880, beats even the pyramid's original height by about 10 m, which shows how far masonry building came in the 4,500 years between them.

Inside the pyramid: chambers at different heights

The pyramid isn't solid all the way through. A series of passages and chambers sits at different levels, which visitors can partly explore:

• Robbers' Tunnel: today's visitor entrance, cut into the north face about 7 m above the base. It runs roughly 27 m inward to join the original Ascending Passage.
• Grand Gallery: a corbelled passage about 8.6 m high and nearly 47 m long, rising steeply toward the King's Chamber.
• King's Chamber: a granite room holding Khufu's empty sarcophagus, about 43 m above the base. Above it are five low relieving chambers. These were first entered in the nineteenth century, and their walls carry painted builders' marks naming Khufu.
• Queen's Chamber and Subterranean Chamber: a smaller room on the pyramid's axis, and an unfinished chamber cut into the bedrock below ground level.

Voids found with muons

In 2017 the ScanPyramids project, run by Cairo University and the French HIP Institute, used muon detectors to find a large hidden cavity above the Grand Gallery. Particles from cosmic rays pass through stone and are absorbed more where the stone is denser, so the detectors could "see" a gap inside. Three different detector types confirmed a void at least 30 m long. In 2023 the same team pushed an endoscope through a joint in the north face and filmed a roughly 9 m corridor about 2 m wide behind the entrance chevrons. Neither space changes the outside measurements, but both show how much is still unknown about how the pyramid was built.

Visiting and seeing its scale

The pyramid sits on the Giza plateau on the western edge of Greater Cairo, beside the pyramids of Khafre and Menkaure and the Sphinx. A general ticket covers the plateau, and the interior needs its own ticket, often with a daily cap on numbers. Climbing the pyramid is strictly prohibited.

Two simple observations help you take in the 138.5 m height in person. First, the lowest courses of core blocks are each roughly a meter high, so a visitor at the base comes up only to the first or second step. Second, walk to the south side, where a few original casing blocks survive at ground level. Their smooth angled faces show the 51.85° slope Petrie measured, and following that line upward in your mind gives you the lost apex at 146.6 m. For more of the world's oldest and tallest structures, browse our landmarks hub or the full tallest lists.