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How long is 640 milimeters?

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It's about as long as a Woman's Footstep.
In other words, the length of a Woman's Footstep is 1 times 640 milimeters.
(for healthy, middle-aged woman of average height; single step length)
According to studies by The University of Oklahoma's Health Sciences Center, the average length of a woman's step is 660 milimeters, for an average stride (two-step's length) of 1,300 milimeters. The average person walks at a speed of about 1.3 m/s
It's about four-fifths as long as a Man's Footstep.
In other words, 640 milimeters is 0.81 times the length of a Man's Footstep, and the length of a Man's Footstep is 1.2 times that amount.
(for healthy, middle-aged man of average height; single step length)
It's about four-fifths as tall as Verne Troyer.
In other words, 640 milimeters is 0.79 times the height of Verne Troyer, and the height of Verne Troyer is 1.3 times that amount.
(1969-) (actor)
It's about seven-tenths as tall as General Tom Thumb.
In other words, the height of General Tom Thumb is 1.4 times 640 milimeters.
(a.k.a. Charles Sherwood Stratton) (1838-1883) (circus performer; height at death)
It's about one-and-two-thirds times as tall as a Bowling Pin.
In other words, the height of a Bowling Pin is 0.595 times 640 milimeters.
(USBC specifications; tenpin)
It's about three-fifths as tall as Kenny Baker.
In other words, 640 milimeters is 0.58 times the height of Kenny Baker, and the height of Kenny Baker is 1.7 times that amount.
(a.k.a. Kenneth George Baker) (1934-) (actor)
Kenny Baker, most famous for his role as R2-D2 in the Star Wars film franchise, is an LP with a height of 1,100 milimeters. Baker and his wife, Eileen, both made brief appearances as the small, woodland creatures known as Ewoks in the 1984 Star Wars movie, Star Wars: Return of the Jedi (a.k.a. Star Wars Episode VI: Return of the Jedi).
It's about half as tall as Hervé Villechaize.
In other words, 640 milimeters is 0.53 times the height of Hervé Villechaize, and the height of Hervé Villechaize is 1.9 times that amount.
(a.k.a. Hervé Jean-Pierre Villechaize) (1943-1993) (actor)