It's about one-thirtieth as heavy as The CN Tower
In other words, 4,056,250 kilograms is 0.03440 times the weight of The CN Tower, and the weight of The CN Tower is 29.07 times that amount.(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada)
The CN Tower weighs approximately 117,910,000 kilograms. The Tower is home to the world's highest glass floor — a viewing area that allows visitors to look straight down 342 m (1,120 ft) to the ground below.
It's about forty times as heavy as a Blue Whale
In other words, 4,056,250 kilograms is 38.8 times the weight of a Blue Whale, and the weight of a Blue Whale is 0.026 times that amount.(Balaenoptera musculus)
Blue whales weigh between 73,000 and 136,000 kg. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.001 kilograms each.
It's about one-fiftieth as heavy as The Sears Tower
In other words, 4,056,250 kilograms is 0.020 times the weight of The Sears Tower, and the weight of The Sears Tower is 49.75 times that amount.(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 201,800,000 kilograms. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
It's about 55 times as heavy as The Space Shuttle
In other words, 4,056,250 kilograms is 57 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 0.02 times that amount.(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 71,000 kilograms. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 19,737 kg.
It's about one-eightieth as heavy as The Empire State Building
In other words, 4,056,250 kilograms is 0.012 times the weight of The Empire State Building, and the weight of The Empire State Building is 81.3 times that amount.(New York City, New York)
The Empire State Building weighs approximately 331,000,000 kilograms. About 4% of the building's weight is its 6,000 cu. m (200,000 cu. ft) of limestone façade.
It's about one-two-hundredth as heavy as The Golden Gate Bridge
In other words, 4,056,250 kilograms is 0.0050 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 198 times that amount.(San Francisco, California and Marin County, California) (Post 1986 weight reduction; total weight of bridge, anchorage, and approaches)
Following the completion of the 1986 project to eliminate excess material, the total weight of the Golden Gate Bridge — including its anchorages and approaches — is 805,000,000 kilograms. The two main cables in the spanning the bridge are spun out of a total of 129,000 km (80,200 mi) of wire.
It's about 350 times as heavy as an Anchor of a Cruise Ship
In other words, 4,056,250 kilograms is 359 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 0.0028 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 11,300 kg. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."