How Tall Is the Pantheon?
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The Pantheon is about 43.3 metres (142 ft) from the floor to the inside of the dome — conventionally the same figure as its interior diameter, which is why the rotunda is described as accommodating an inscribed sphere. It remains the largest unreinforced concrete dome ever built.
Here are the key dimensions visitors ask about, in metric and imperial, with a note wherever published surveys disagree.
What are the main Pantheon dimensions?
Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
- Interior height: about 43.3 m (142 ft)
- Interior diameter: about 43.3 m (142 ft)
- Oculus diameter: about 8.8 m (29 ft)
- Wall thickness at the base: about 6.4 m (21 ft)
- Shell thickness at the oculus: about 1.2 m (4 ft)
- Portico depth: about 15.5 m (51 ft)
- Portico width: about 33 m (108 ft)
- Dome mass: commonly estimated at several thousand tonnes; figures around 5,000 tonnes are engineering estimates rather than measurements
Book Pantheon Tickets, Tours & Hotels
Avoid buying your ticket on site by booking ahead — compare the official Musei Italiani ticket and the three best-known third-party providers, plus hotels next to Piazza della Rotonda.
Official Pantheon Tickets — Musei ItalianiSold by Italy's Ministry of Culture. €7 admission from July 2026. Any online transaction fee is shown at checkout.Musei Italiani Official SiteMusei Italiani is the official Pantheon ticket seller. Third-party products may be tours, hosted-entry products or bundled services — check the exact inclusions before booking.
TiqetsCompare advance Pantheon tickets, audio guides & combo bundlesCheck PricesKlookPantheon tickets & guided tours — cancellation varies by productCheck PricesTrip.comReward credits & frequent traveller dealsCheck PricesHotels near the PantheonStay 2 minutes from Piazza della Rotonda — compare boutique stays on Trip.com.View HotelsCompare all three providers to find the best price for your dates.How large are the dome and oculus?
The coffered ceiling has five rings of 28 sunken panels each — 140 in total — stepping inward towards the oculus. The coffers reduce the mass of the shell without weakening it, and the concrete mix grades from heavier aggregate low down to lighter volcanic material higher up. The transition is gradual and varies through the structure rather than being a neat two-step change from basalt to pumice.
The oculus is around 8.8 m wide and has been open to the sky since antiquity. It is the principal architectural light source; the great bronze doors admit daylight as well when open. You will often read that the opening is ringed with bronze — the original ancient facing is not something we can confirm from an authoritative published source, so we do not state it as fact.
Engineering deep-dive: engineering secrets of the Pantheon's dome.
How tall are the portico columns?
Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
- 16 monolithic shafts — 8 across the front, 8 behind in two rows
- Height: about 11.8 m (39 ft) each
- Diameter: about 1.5 m (5 ft) at the base
- Weight: commonly estimated at around 60 tonnes per shaft; there is no published measurement for each individual column
- Material: Egyptian granite. The grey shafts are associated with Mons Claudianus in the Eastern Desert, the pink and red granite with the Aswan region
- Transport: overland to the Nile, downriver, then by sea to Ostia and up the Tiber. Distances quoted as a single precise figure depend on an assumed route
What does the inscribed sphere mean?
Because the interior height and diameter are conventionally the same, the rotunda is described as accommodating an inscribed sphere: the dome forms the upper hemisphere and the lower half would just touch the floor. That equivalence is the design intent and it is legible when you stand under the oculus, even though individual surveys record the two dimensions a few centimetres apart.
How does the Pantheon compare with other domes?
Full comparison: the largest unreinforced concrete dome in the world . Use these as approximate architectural dimensions rather than survey specifications.
- Pantheon, Rome (about 125 AD): around 43.3 m — unreinforced concrete, never surpassed in that material
- Florence Cathedral (1436): around 45.5 m — brick, double-shell, with iron and timber chains
- St Peter's, Vatican (1590s dome): marginally narrower than the Pantheon's; masonry, on a tall drum
- Hagia Sophia, Istanbul (537): around 31 m — brick, carried on pendentives
- US Capitol (1866): around 29 m — cast iron
Full comparison: the largest unreinforced concrete dome in the world.
Why do published measurements vary?
The Pantheon is not a machined object. Its walls are not perfectly circular, the floor has been relaid, and different surveys measure from slightly different reference points. That is why reputable sources give 43.2 m, 43.3 m and 43.4 m for the same dimension, and why the mass of the dome is always an estimate derived from assumed material densities. Any article quoting these to the centimetre without naming a survey is over-claiming.
Sources and further reading
- Encyclopaedia Britannica — Pantheon, Rome: structure, dating and history
- Direzione Musei nazionali della città di Roma (Ministry of Culture) — official Pantheon page: hours, tickets and access
- UNESCO World Heritage List — Historic Centre of Rome
- Sovrintendenza Capitolina ai Beni Culturali — Rome's monuments and conservation
Facts on this page last checked: August 2026. Prices, opening hours and transport routes in Rome change — always confirm with the official source before your visit.
Planning to go inside? Standard adult admission is €7 from 1 July 2026, and under-18s enter free — see our Pantheon ticket guide for official booking, free-entry days and what each ticket includes.
Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
Adult sightseeing admission is €7 from 1 July 2026 (€5 from July 2023). Under-18s and first-Sunday visitors enter free; Mass attendance is free for worship, not sightseeing. Use Musei Italiani as the official seller and our Pantheon ticket guide to distinguish admission from optional extras.
Continue reading about the Pantheon
Pantheon RomeHow Many People Visit the Pantheon Each Year?
~9 million in 2024. Busiest months and how the €7 fee changed numbers.
Pantheon RomeTop 10 Facts About the Pantheon
Ten quick facts from the world's biggest unreinforced concrete dome to Pentecost petals.
Pantheon RomeWho Built the Pantheon in Rome?
Agrippa, Hadrian and the probable architect Apollodorus of Damascus.
Pantheon RomeCan You Buy Pantheon Tickets at the Entrance?
Yes — €7 at the door. Realistic queue times and when walk-up still works.
Frequently Asked Questions
How tall is the Pantheon?
About 43.3 m (142 ft) from the floor to the inner crown of the dome — conventionally equal to the interior diameter. Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
How wide is the Pantheon dome?
About 43.3 m (142 ft) interior diameter, and still the largest unreinforced concrete dome ever built. Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
How big is the oculus?
About 8.8 m (29 ft) across. It is the principal architectural light source in the rotunda; the open doorway also admits daylight. Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
How tall are the portico columns?
Each granite shaft is about 11.8 m (39 ft) tall and was quarried in Egypt. Published weight estimates run to roughly 60 tonnes per shaft. Use these as approximate architectural dimensions rather than survey specifications. Inside the rotunda, compare the dome’s height with the room’s width to understand the familiar sphere description.
Is the Pantheon dome bigger than St Peter's?
The Pantheon's interior diameter is marginally the larger of the two, and it is unreinforced concrete rather than masonry. St Peter's stands far higher above ground because its dome sits on a tall drum. Use these as approximate architectural dimensions rather than survey specifications.