It's about as heavy as a Blue Whale
It's about one-and-two-fifths times as heavy as The Space Shuttle
In other words, the weight of The Space Shuttle is 0.710 times 100 tonnes.(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 tonnes. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 20 tonnes.
It's about two-thirds as heavy as a House
In other words, 100 tonnes is 0.6410 times the weight of a House, and the weight of a House is 1.560 times that amount.(149 sq. m, single-level, unfurnished)
A 149 sq. m (1,600 sq. ft), single-story, unfurnished house (without extensive masonry) of the type commonly found in America would weigh approximately 156 tonnes, based on the weight of the included materials. In contrast, a yurt — a type of dwelling structure popular among nomadic peoples of East Asia — typically weighs less than 0.460 tonnes.
It's about one-fifth as heavy as Christ the Redeemer (statue)
In other words, 100 tonnes is 0.1570 times the weight of Christ the Redeemer (statue), and the weight of Christ the Redeemer (statue) is 6.370 times that amount.(a.k.a. O Cristo Redentor, a.k.a. Christo redemptor) (Rio de Janeiro, Brazil)
Christ the Redeemer weighs 635 tonnes. The statue overlooks the city of Rio de Janeiro from atop the 709.9-meter (2,329 ft) granite peak in the Tijuca Forest National Park.
It's about nine times as heavy as an Anchor of a Cruise Ship
In other words, 100 tonnes is 8.850 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 0.1130 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 11.30 tonnes. 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."
It's about one-fifteenth as heavy as a Tree (Sierra Redwood)
In other words, the weight of a Tree (Sierra Redwood) is 13 times 100 tonnes.(a.k.a. Giant Sequoia, a.k.a. Sierran redwood, a.k.a. Wellingtonia, a.k.a. "Big Tree", Sequoiadendron giganteum)
The weight of wood in a Giant Sequoia is 1,300 tonnes. General Sherman, a specimen in Sequoia National Park in Visalia, California, is the largest tree in the world by volume, with an estimated weight of about 1,900 tonnes.
It's about sixteen times as heavy as a Tyrannosaurus rex
In other words, the weight of a Tyrannosaurus rex is 0.063 times 100 tonnes.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 6.4 tonnes while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.