- Cost of construction of the basilica = 46,800,052 ducats
- Geographic orientation = chancel west, nave east
- Capacity = 60,000 +
- Total length = 730 feet (220 m)
- Total width = 500 feet (150 m)
- Interior length incl. vestibule = 693.8 feet (211.5 m), more than 1/8 mile.
- Length of the transepts in interior = 451 feet (137 m)
- Width of nave = 90.2 feet (27.5 m)
- Width at the tribune = 78.7 feet (24.0 m)
- Internal width at transepts = 451 feet (137 m)
- Internal height of nave = 151.5 feet (46.2 m) high
- Total area = 227,070 square feet (21,095 m2), more than 5 acres (20,000 m2).
- Internal area = 163,182.2 square feet (3.75 acres; 15,160.12 m2)
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- Height from pavement to top of cross = 452 feet (138 m)
- Façade = 167 feet (51 m) high by 375 feet (114 m) wide
- Vestibule = 232.9 feet (71.0 m) feet wide, 44.2 feet (13.5 m) deep, and 91.8 feet (28.0 m) high
- The internal columns and pilasters = 92 feet (28 m) tall
- The circumference of the central piers = 240 feet (73 m)
- Outer diameter of dome = 137.7 feet (42.0 m)
- The drum of the dome = 630 feet (190 m) in circumference and 65.6 feet (20.0 m) high, rising to 240 feet (73 m) from the ground
- The lantern = 63 feet (19 m) high
- The ball and cross = 8 and 16 feet (2.4 and 4.9 m), respectively
- St. Peter's Square = 1,115 feet (340 m) long, 787.3 feet (240.0 m) wide
- Each arm of the colonnade = 306 feet (93 m) long, and 64 feet (20 m) high
- The colonnades have 248 columns, 88 pilasters, and 140 statues
- Obelisk = 83.6 feet (25.5 m). Total height with base and cross, 132 feet (40 m).
- Weight of obelisk = 360.2 short tons (326,800 kg; 720,400 lb)
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