It's about nine-tenths as heavy as a Cat.
In other words, the weight of a Cat is 1 times 4 kilograms.(Felis catus) (Domestic; healthy weight)
The average domestic cat should weigh between 4 and 5 kg. Cats are known for their righting reflex, which allows them to land on their feet and survive falls from heights of 1 m (3 ft) up to about 21 m.
It's about four-fifths as heavy as a Gallon of Paint.
It's about one-and-two-fifths times as heavy as a Brick.
In other words, the weight of a Brick is 0.710 times 4 kilograms.(Standard, traditional face brick - 1,900 cu. cm (120 cu. in))
A standard, traditional face brick weighs an average of 2.9 kg. The steeple of the Church of St. Martin in Landshut, Germany is said to be the tallest brick tower in the world at a height of 130.6 m (428.5 ft) and was constructed using an estimated 650,000 bricks.
It's about three-fifths as heavy as a Bowling Ball.
In other words, 4 kilograms is 0.5878993660 times the weight of a Bowling Ball, and the weight of a Bowling Ball is 1.700971390 times that amount.(most common selection among male bowlers)
With an allowable range of 4.989516070 kilograms, the most-preferred bowling ball weight among adult, male bowlers is 6.803885550 kilograms. Because regulation balls measure the same diameter irrespective of their weight, ball density varies by size and balls weighing less than about 5 kg (11 lbs) will float in water.
It's about one-and-four-fifths times as heavy as a Chihuahua.
In other words, 4 kilograms is 1.780 times the weight of a Chihuahua, and the weight of a Chihuahua is 0.5620 times that amount.(a.k.a. Chihuahue(o) (FCI standard)
The F&d&ration Cynologique Internationale (FCI) calls for Chihuahuas to weigh about 1.5 to 3 kg. Relative to their body sizes, Chihuahuas have the largest brain size of any dog breed.
It's about two-fifths as heavy as a Dachshund.
In other words, the weight of a Dachshund is 3 times 4 kilograms.(a.k.a. "Wiener dog", a.k.a. Teckel, a.k.a. Dackel, a.k.a. "hot dog dog", a.k.a. "sausage dog", a.k.a. "doxie") (FCI standard; standard size)
The Fédération Cynologique Internationale (FCI) calls for dachshunds to weigh about 9 kg. Despite of their small size, a 2008 survey conducted by the University of Pennsylvania named dachshunds as the most aggressive dog breed.
It's about three times as heavy as a Human Brain.
In other words, 4 kilograms is 2.960 times the weight of a Human Brain, and the weight of a Human Brain is 0.3380 times that amount.(adult)
The average weight of an adult human brain is between 1.350 kilograms. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.