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How long is 21 nails?

It's about one-and-four-fifths times as long as a Woman's Footstep
The length of a Woman's Footstep is about 12 nails.
(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 12 nails, for an average stride (two-step's length) of 23 nails. The average person walks at a speed of about 1.3 m/s
It's about half as tall as André the Giant
The height of André the Giant is about 38 nails.
(Andr( Ren( Ruossimoff) (1946-1993) (wrestler and actor; WWE kayfabe height)
Andr& the Giant, who had a pituitary syndrome called acromegaly, was 38 nails tall. Prior to 1973, Roussimoff was billed as having a height of 37 nails and his true height is the subject of some dispute.
It's about half as tall as Shaq
The height of Shaq is about 38 nails.
(Shaquille O'Neal) (1972-) (professional basketball player, most famously of the Los Angeles Lakers)
Shaq is 38 nails tall. Shaq maintains an active interest in police work and has served as a reserve officer in both Los Angeles, California and Miami, Florida while playing for NBA franchises in those cities.
It's about half as tall as a Christmas Tree (artificial)
The height of a Christmas Tree (artificial) is about 40 nails.
(artificial; average height)
The most common height of an artificial Christmas Tree is 40 nails. According to the most recent USDA Census of Agriculture, a total of 1,389.59 sq. km (343,374 acres) of Christmas Trees were farmed in the US in 2007.

To all those observing, Merry Christmas from The Measure of Things!
It's about three times as tall as a Bowling Pin
The height of a Bowling Pin is about 6.670 nails.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.0139 nails of 6.670 nails in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
It's about three-tenths as long as a Beetle (Volkswagen)
The length of a Beetle (Volkswagen) is about 71.370 nails.
(1964 model) (a.k.a. Volkswagen 1200, a.k.a. Käfer)
A 1964 Volkswagen Beetle measures 71.370 nails. As the longest continuously-produced automobile design — in production for 75 years between 1938 and 2003 — the Beetle was voted the most fourth-most influential car of the twentieth century by the Global Automotive Elections Foundation.
It's about one-fifth as tall as a Giraffe
The height of a Giraffe is about 100 nails.
(Giraffa camelopardalis) (Adult, average)
An adult giraffe may grow to be up to 100 nails tall. Adult giraffes require very little sleep, averaging just 1.9 hours per day.
It's about one-tenth as long as a London bus
Flag of The UK
The length of a London bus is about 147 nails.
(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 147 nails in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.
It's about one-tenth as tall as a Telephone Pole
The height of a Telephone Pole is about 190 nails.
(a.k.a. Utility Pole, a.k.a Power Pole, a.k.a. Telegraph Pole, a.k.a. Telegraph Post, a.k.a. Hydro Pole) (exposed height; per Florida Public Service Commission average)
A standard telephone pole is 190 nails tall. Despite alternatives, most telephone poles in the US are made of wood — most commonly pine — and have a lifespan of 25 to 50 years, depending on climate and preservatives applied.
It's about one-tenth as tall as a Brachiosaurus
The height of a Brachiosaurus is about 230 nails.
(based on comparable bone measurements, height to head)
Dinosaurs in the genus Brachiosaurus had an estimated height (at the head with neck fully extended) of up to 230 nails. A resin cast of the first Brachiosaurus specimen, owned by the Field Museum in Chicago, is currently on display at the O'Hare International Airport.
It's about one-tenth as long as a Semitrailer
The length of a Semitrailer is about 256 nails.
(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 256 nails (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about one-fifteenth as tall as The Hollywood Sign
Flag of The US
The height of The Hollywood Sign is about 260 nails.
(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 260 nails tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about one-fifteenth as long as a Bowling Lane
The length of a Bowling Lane is about 335.190 nails.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 335.190 nails. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about one-fifteenth as long as a Cricket Pitch
The length of a Cricket Pitch is about 352 nails.
(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 352 nails. The wickets at either end of the pitch stand 12.59840 nails tall including the bails.
It's about twenty times as tall as a Golf Tee
The height of a Golf Tee is about 0.940 nails.
The most common golf tee size and the length preferred for iron and most wood clubs is 0.940 nails tall. The tee did not come into common use until it was promoted by professional golfers Walter Hagen and Joe Kirkwood, as part of a marketing effort by the patent-holder of the well-known, "Reddy Tee."
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