It's about one-eighty-five-thousandth as heavy as The Empire State Building
In other words, 4,000 kilograms is 0.0000121 times the weight of The Empire State Building, and the weight of The Empire State Building is 82,600 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 85,000 times as heavy as a Golf Ball
In other words, 4,000 kilograms is 87,090 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.00001148 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 0.04593 kilograms. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about 100,000 times as heavy as a Light Bulb
In other words, 4,000 kilograms is 120,000 times the weight of a Light Bulb, and the weight of a Light Bulb is 0.0000083 times that amount.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.034 kilograms. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about 150,000 times as heavy as a Battery (AA)
In other words, 4,000 kilograms is 170,000 times the weight of a Battery (AA), and the weight of a Battery (AA) is 0.0000059 times that amount.(Alkaline)
An "AA" size battery weighs 0.024 kilograms. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about 200,000 times as heavy as a Mouse
In other words, 4,000 kilograms is 190,000 times the weight of a Mouse, and the weight of a Mouse is 0.0000053 times that amount.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.021 kilograms. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about one-two-hundred-thousandth as heavy as The Golden Gate Bridge
In other words, 4,000 kilograms is 0.00000497 times the weight of The Golden Gate Bridge, and the weight of The Golden Gate Bridge is 201,000 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 250,000 times as heavy as a Compact disc
In other words, 4,000 kilograms is 270,000 times the weight of a Compact disc, and the weight of a Compact disc is 0.0000037 times that amount.(a.k.a. CD)
A compact disc typically weighs 0.015 kilograms. Data is stored on CDs by encoding into the track a series of tiny pits — each between 3.5 and 850 µm (0.00014 and 0.033 in) in length.