It's about 550,000 times as heavy as a Nail
In other words, 420 kilograms is 530,000 times the weight of a Nail, and the weight of a Nail is 0.0000019 times that amount.(for 15-gauge, 2-inch, finishing nails)
A two-inch finishing nail weighs 0.00079 kilograms. Nails have been in use for more than 5,400 years and were ven used as a medium of exchange in ancient times.
It's about one-eight-hundred-thousandth as heavy as The Empire State Building
In other words, 420 kilograms is 0.00000127 times the weight of The Empire State Building, and the weight of The Empire State Building is 787,000 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 0.0000005 times as heavy as The Golden Gate Bridge
In other words, 420 kilograms is 0.000000522 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 1,920,000 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 2,000,000 times as heavy as a Raindrop
In other words, 420 kilograms is 2,000,000 times the weight of a Raindrop, and the weight of a Raindrop is 0.00000050 times that amount.(a.k.a. drop, a.k.a. droplet) (average)
The weight of a raindrop depends heavily on the type of weather, but averages about 0.0002 kilograms. The familiar teardrop shape of a raindrop is actually an optical illusion, caused by the reflection of the light and the motion of the drop.
It's about 0.00000007 times as heavy as The Great Pyramid of Giza
In other words, 420 kilograms is 0.000000071 times the weight of The Great Pyramid of Giza, and the weight of The Great Pyramid of Giza is 14,000,000 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt)
The Great Pyramid of Giza has an estimated mass of 5,900,000,000 kilograms. The 2,300,000 stones used in the construction of the pyramid weighed an average 2,300 kilograms and were quarried from distances of up to 805 km (500 mi) away.
It's about 20,000,000 times as heavy as a Grain of Rice
In other words, 420 kilograms is 20,000,000 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.000000050 times that amount.(conventional; US; long-, medium-, and short-gran varieties; uncooked)
With great differences in variety, the average among a sampling of common short-, medium- and long-grain rices finds that a single grain weighs about 0.0000210 kilograms before cooking. A staple through most of human history, archaeological evidence indicates that the earliest rice cultivation was about 11,500 years ago.
It's about 95,000,000 times as heavy as a Grain of Sand
In other words, 420 kilograms is 95,000,000 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.000000011 times that amount.(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000440 kilograms. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.