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How long is 100 feet?

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It's about 300,000 times as tall as a Human hair, Strand of.
In other words, 100 feet is 310,000 times the height of a Human hair, Strand of, and the height of a Human hair, Strand of is 0.00000320 times that amount.
(average)
A strand of human hair averages 99 µm (micrometers), with blond hair being the finest and black hair the thickest. On a healthy scalp, each strand of hair will last up to 6 years.
It's about one-four-hundred-thousandth as long as The Diameter of Earth.
In other words, 100 feet is 0.00000238941260 times the length of The Diameter of Earth, and the length of The Diameter of Earth is 418,512.90 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has a diameter of approximately 41,851,289 feet at the Equator. The first complete view of Earth's diameter was in a photograph taken from a V-2 rocket launched in 1942 by the United States Army, which reached an altitude of 343,200 feet.
It's about 0.0000008 times as long as The Circumfrence of Earth.
In other words, 100 feet is 0.000000760573660 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 1,314,797 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 131,479,700 feet. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about 4,000,000 times as long as a Red Blood Cell.
In other words, 100 feet is 4,100,000 times the length of a Red Blood Cell, and the length of a Red Blood Cell is 0.000000240 times that amount.
(a.k.a. RBCs, a.k.a. haematids, a.k.a. erythrocyte, a.k.a. erythroid cells, a.k.a. red blood corpuscles) An average Red Blood Cell measures 7.5 µm (micrometers) in diameter. An average human has 20 - 30 trillion red blood cells in their body and each cell completes a circulatory lap in about 20 seconds.
It's about 5,000,000 times as long as a Nucleus (Cellular).
In other words, the length of a Nucleus (Cellular) is 0.000000200 times 100 feet.
(for animal cell)
The nucleus of an animal cell measures an average of 0.0000200 feet. The nucleus is the largest organelle in these cells, accounting for about 10% of the cell's total volume.
It's about 0.00000008 times as long as The Distance from Earth to the Moon.
In other words, 100 feet is 0.000000079284880 times the length of The Distance from Earth to the Moon, and the length of The Distance from Earth to the Moon is 12,612,750 times that amount.
(a.k.a. Luna) (median of semi-major axis, or apigee, and semi-minor axes, or perigee)
The orbit of the Moon around the Earth is elliptical, with an average distance of 1,261,275,000 feet from center-to-center. About 428.376 kg of moon rock have been cataloged on the Earth, from the American Apollo and Soviet Luna Programs, and from samples that have been extracted from meteorites.
It's about 15,000,000 times as long as an E. coli Bacterium.
In other words, the length of an E. coli Bacterium is 0.0000000670 times 100 feet.
(Escherichia coli) (rod-shaped configuration)
An rod-shaped E. coli bacterium measures about 0.00000660 feet in length. A staple of biology labs, E. coli can reproduce in as little as twenty minutes.