The Size of the Pyramids of Giza: All Dimensions at a Glance

How big is the largest pyramid of Giza? The short answer is: 146.6 meters high, 230.3 meters base side, around 5.3 hectares of base area.

The longer answer is more interesting because it explains why different sources cite slightly different numbers and which of these figures have actually been measured. After all, a significant portion of common data is not measured but calculated.

What exists can be measured: the current height, the base sides, the angles at the corners. Everything that is missing must be calculated: the original height, because the apex is gone; the volume, because it depends on the original height; and the mass, because it depends on the volume and an assumed density.

This chain is the reason for discrepancies. A small uncertainty in the reconstructed height propagates into the volume and from there into the mass. In the end, you get a figure in millions of tons based on an assumption about a missing capstone.

Another reason for differing figures is the reference point. Some sources cite the height from today's ground level, others from the original base plate, which lies partly under sand. For the base side, sometimes the edge of the casing stones is measured, sometimes that of the core masonry visible today, and there is a difference of well over a meter between them. Therefore, when comparing two numbers, one must first check what they refer to.

This page provides the numbers for all three structures and states for each how it was derived.

Better surveyed than most new buildings

The dimensions of the Great Pyramid are better known than those of most modern structures, and this is due to a surveying history spanning over a hundred years.

The first survey according to modern standards dates back to the early 1880s. It yielded a base side of 230.3475 meters, with a stated error margin of three centimeters. Later recordings in the 20th century confirmed this and refined it further; today, the base side is given as approximately 230.33 meters, with an uncertainty in the range of just over one centimeter.

One should realize what this means. Over a length of two hundred thirty meters, the four sides deviate from each other by only a few centimeters. This is an accuracy of less than one-tenth of a permille, achieved with measuring tapes, plumb bobs, and sight lines.

This precision is also the reason why the structures continue to be surveyed today. A mathematical analysis of the design calculates which simple ratios might underlie the dimensions, and such work is only possible because the initial values are so precise.

Noteworthy is the contrast with the height. The base side can be measured because it is there. The original height cannot be measured because the uppermost layers are missing; it is calculated backwards from the base side and slope. Thus, the most famous number of this structure is the least direct, while the unassuming base side is the most robust.

The same applies to the two neighboring structures, albeit with somewhat larger tolerances. Even there, deviations are in the range of centimeters, not meters.

How wide are the pyramids?

How wide are the Pyramids of Giza if we mean not the height but the extent on the ground?

The base side of the largest measures around 230 meters, that of the middle one around 215, and that of the smallest about 102 by 105 meters. The latter is therefore the only one that is not exactly square, which is not surprising for an unfinished structure.

The base area of the Pyramids of Giza results from squaring these figures. For the largest, this is around 53,000 square meters, i.e., just over five hectares or roughly seven football fields. For the middle one, around 46,000, and for the smallest, around 10,700 square meters.

For comparison: A football field measures around 7,000 square meters. So, about seven fit onto the base area of the largest pyramid, about six onto the middle one, and one and a half onto the smallest. This conversion is not entirely precise because a football field is rectangular and a pyramid's base is square, but it serves well as a mental image of size.

This number is the most intuitive of all because it can be experienced on foot. Walking around the largest pyramid covers just over nine hundred meters and takes around twenty minutes with photo stops. If you walk around two structures, you are out for an hour, and that is a serious distance on the site without shade.

The official description of the structure also lists the common dimensions in rounded form, which fits the state of evidence: Specifying the base side to the exact centimeter is meaningful, but no other dimension is.

Volume and Weight are Estimates

The volume of the Great Pyramid in cubic meters is usually cited as around 2.6 million, and this number deserves an explanation.

It is calculated from the base area and height using the formula for a pyramid, i.e., one-third times base area times height. With 53,000 square meters and 146.6 meters, this yields just over 2.58 million cubic meters. For the middle pyramid, the value is around 2.2 million, and for the smallest, around 0.24 million.

Two caveats apply. First, the calculation is based on the reconstructed original height, not the current one. Second, the structure is not a pure stone body: in the lower section lies a natural rock core that was never removed and whose extent is unknown. Therefore, the actually built volume is below the calculated one, and by how much remains open.

With the weight of the Pyramids of Giza, a third uncertainty comes into play. Mass is estimated from volume via the density of the rock, and limestone varies significantly in this regard. The widespread figure of just under six million tons for the largest structure is therefore an order of magnitude, not a measurement. Nothing has ever been weighed.

The same caution applies to the widespread figure of 2.3 million blocks. This too is calculated, namely from the estimated volume divided by an assumed average block volume. Since the blocks vary considerably in size and the rock core reduces the total volume, the actual number could be significantly lower. No one has counted them.

Therefore, anyone passing on one of these numbers should round it. A figure like 5,955,000 tons suggests a precision that does not exist.

Why Dimensions Do Not Convey Scale

Finally, the point where dimensions fail in everyday life: they do not convey scale.

One hundred forty-six point six meters is a number everyone can read but no one can feel. Even the comparison with a church tower helps only to a limited extent, because a tower is slender and a pyramid is massive. What makes the difference is not the height, but the area on which this height stands.

On-site, a different approach works better. Stand at a corner and look along the edge. It disappears after two hundred thirty meters, and this stretch contains the real information. Then look up at the same corner: the courses become smaller towards the top, and the uppermost ones are barely distinguishable to the naked eye.

Distances on the site also belong to the question of scale. Between the largest and the smallest pyramid lies a straight-line distance of just over seven hundred meters, and the path there leads over unpaved ground. If you want to walk around all three structures and run between them, you cover several kilometers. This is why there is shuttle service on the site, and it also explains why photos regularly underestimate distances.

The second usable approach is your own body. The lowest stone courses reach an adult person to about hip height, sometimes higher. There are around two hundred such courses stacked on top of each other. You can do this calculation in your head, and it works better than any meter reading.

A final note for everyone passing on numbers: Always specify what they refer to. The figure 146.6 meters without the addition "originally" is misleading because the structure has not had this height for centuries. The same applies to volume and mass, which look like measurements without a hint of their derivation. These additions cost three words and prevent half of the circulating misunderstandings.

The entire area has been protected since 1979 as a World Heritage Site, listed as a contiguous landscape from Giza to Dahshur.

Frequently asked questions

How big is the Great Pyramid?

Originally 146.6 meters high with a base side of around 230.3 meters, today around 138.8 meters. The base area is approximately 5.3 hectares.

Which figures are measured?

The current height, the base sides, and the angles. Original height, volume, and mass are calculated or estimated from these.

Why do sources give different numbers?

Because they use different starting values and rounding. For the base side, differences are in the centimeter range; for mass, in hundreds of thousands of tons.

How long does a circumambulation take?

The largest pyramid has a circumference of just over nine hundred meters. With photo stops, this is about twenty minutes, without shade.

How heavy are the individual blocks?

On average about two and a half tons. Individual pieces weigh significantly more, the granite beams above the burial chamber several dozen tons.