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How long is 4 kilometers?

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It's about 2,000 times as long as a King Size Bed
In other words, 4 kilometers is 1,969 times the length of a King Size Bed, and the length of a King Size Bed is 0.0005079 times that amount.
(North American/Australian standard; length; mattress only)
A King-Size mattress measures 0.002032 kilometers from head to foot. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m (49 sq. ft) for those in positions of wealth or power.
It's about 2,000 times as tall as Michael Jordan
In other words, the height of Michael Jordan is 0.0005 times 4 kilometers.
(1963-) (professional basketball player, most famously of the Chicago Bulls)
Michael Jordan is 0.00198 kilometers tall. While a sophomore in high school, Jordan was about 0.0002 kilometers shorter and was denied the opportunity to play on the varsity team, supposedly because his coach considered him too short.
It's about 2,000 times as long as a Full Size Bed
In other words, 4 kilometers is 2,100 times the length of a Full Size Bed, and the length of a Full Size Bed is 0.0004762 times that amount.
(North American/Australian standard; length; mattress only)
A Full-Size mattress measures 0.001905 kilometers from head to foot. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m (49 sq. ft) for those in positions of wealth or power.
It's about 2,000 times as long as a Twin Size bed
In other words, 4 kilometers is 2,100 times the length of a Twin Size bed, and the length of a Twin Size bed is 0.0004762 times that amount.
(North American/Australian standard; length; mattress only)
A Twin-Size mattress measures 0.001905 kilometers from head to foot. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m (49 sq. ft) for those in positions of wealth or power.
It's about one-two-thousandth as long as The Great Wall of China (total)
In other words, 4 kilometers is 0.000452 times the length of The Great Wall of China (total), and the length of The Great Wall of China (total) is 2,210 times that amount.
(长城, 長城, Chángchéng, a.k.a. 万里长城, 萬里長城, Wànlǐ Chángchéng) (a.k.a. "The long wall of 10,000 Li") (from Shanhaiguan through Lop Nur, China) (total length, all branches)
The Great Wall of China, including all branches and trenches, is 8,850 km. Built and maintained in multiple sections over about eleven centuries, the Great Wall is currently suffering the effects of erosion, especially in the older sections made primarily out of mud.
It's about 2,000 times as tall as a Refrigerator (Side-by-side)
In other words, 4 kilometers is 2,230 times the height of a Refrigerator (Side-by-side), and the height of a Refrigerator (Side-by-side) is 0.000448 times that amount.
(a.k.a. Fridge, a.k.a Icebox) (for G.E. Profile model no. PSDW3YGXSS; total exterior height)
A common refrigerator model measures 0.00179 kilometers in total exterior height. When General Electric released its first widely-marketed refrigerator — the "Monitor Top" model — in 1927, it sold over one million units.
It's about 2,500 times as tall as Napoleon
In other words, the height of Napoleon is 0.00042 times 4 kilometers.
(a.k.a. Napoleon Bonaparte; a.k.a. Napoleon I, a.k.a. Napoleone di Buonaparte) (1759-1821) (French leader)
Despite his frequent characterizations as much shorter than average, Napoleon was a period-average height of approximately 0.0017 kilometers. The mis-characterizations have been attributed to British propaganda and to the confusion between French and British units of measurements used at the time.