It's about 2,000,000 times as heavy as a Playing Card
In other words, 4,000 kilograms is 2,200,000 times the weight of a Playing Card, and the weight of a Playing Card is 0.00000045 times that amount.(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 0.0018 kilograms. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
It's about 3,000,000 times as heavy as a Paper Clip
In other words, 4,000 kilograms is 2,900,000 times the weight of a Paper Clip, and the weight of a Paper Clip is 0.00000034 times that amount.(average)
Notwithstanding the tremendous variation in sizes and materials, a typical paperclip weighs about 0.0014 kilograms. The country of Norway has used the paper clip as something of a national symbol since the end of World War II based on the erroneous notion that the paperclip was invented by a Norwegian, Johan Vaaler. However, the paperclip had already been in existence for at least 30 years by the time of Vaaler patented his paperclip design.
It's about 3,500,000 times as heavy as a Jelly Bean
In other words, 4,000 kilograms is 3,600,000 times the weight of a Jelly Bean, and the weight of a Jelly Bean is 0.00000028 times that amount.(for Jelly Belly beans; approximate)
Made of sugar, corn syrup, and pectin, a single jelly bean weighs about 0.0011 kilograms. President Ronald Reagan cited jelly beans as his favorite candy and 3,200 kilograms of the candies were served at his first inauguration in 1981.
It's about 5,000,000 times as heavy as a Nail
In other words, 4,000 kilograms is 5,100,000 times the weight of a Nail, and the weight of a Nail is 0.00000020 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 20,000,000 times as heavy as a Raindrop
In other words, 4,000 kilograms is 20,000,000 times the weight of a Raindrop, and the weight of a Raindrop is 0.000000050 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 200,000,000 times as heavy as a Grain of Rice
In other words, 4,000 kilograms is 190,000,000 times the weight of a Grain of Rice, and the weight of a Grain of Rice is 0.0000000053 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 900,000,000 times as heavy as a Grain of Sand
In other words, 4,000 kilograms is 910,000,000 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 0.0000000011 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.