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How long is 100 meters?

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It's about one-four-hundred-thousandth as long as The Circumfrence of Earth
In other words, 100 meters is 0.00000249532040 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 400,750.140 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 40,075,014 m. 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 1,000,000 times as long as a Strand of Hair
In other words, the length of a Strand of Hair is 0.000001000 times 100 meters.
(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 1,000,000 times as tall as a sheet of Paper
In other words, the height of a sheet of Paper is 0.000001000 times 100 meters.
(for US Letter, a.k.a. ANSI A; 215.9mm by 279.4mm (8.5 in x 11 in); 20lb)
A single sheet of 20 lb, 8.5 inch x 11 inch paper is just 0.0001 meters thick. This style of paper weighs a mere 5 g per sheet.
It's about 1,000,000 times as tall as a Human hair, Strand of
In other words, the height of a Human hair, Strand of is 0.000001000 times 100 meters.
(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 0.0000003 times as long as The Distance from Earth to the Moon
In other words, 100 meters is 0.0000002601210 times the length of The Distance from Earth to the Moon, and the length of The Distance from Earth to the Moon is 3,844,365 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 384,436,500 meters 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 a Red Blood Cell
In other words, the length of a Red Blood Cell is 0.0000000770 times 100 meters.
(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 15,000,000 times as long as a Nucleus (Cellular)
In other words, the length of a Nucleus (Cellular) is 0.0000000590 times 100 meters.
(for animal cell)
The nucleus of an animal cell measures an average of 0.00000600 meters. The nucleus is the largest organelle in these cells, accounting for about 10% of the cell's total volume.