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Hand (unit)

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A hand is a non-SI unit used to measure length. It is primarily used to measure the height of horses and other equines. This measurement is common in many English-speaking nations. These include the United States, the United Kingdom, Canada, Ireland, and Australia. You may see it written as "h" or "hh." The abbreviation "hh" sometimes stands for "hands high."

Horse-breeding in England and India - and army horses abroad (1906) (14580159299)
Horse-breeding in England and India - and army horses abroad (1906) (14580159299)

To measure a horse, you do not measure to the top of its head. Instead, you measure from the ground to the withers. The withers are the highest non-variable point of the horse's skeleton. Officials may identify the fifth thoracic vertebra to find this spot. In some miniature horse varieties, they measure from the base of the mane hairs. For international competitions, horses can be measured with shoes on. However, the Joint Measurement Board in the UK requires shoes to be removed first.

The math used for hands is not a standard decimal system. It is a base 4 system. This means the numbers after the radix point represent quarters of a hand. Since one hand is four inches, these subdivisions are simply inches. For example, a horse that is 60 inches tall is 15.0 hands. A horse that is 62 inches tall is 15.2 hands. You would say this aloud as "fifteen-two."

Horse-breeding in England and India - and army horses abroad (1906) (14580159299)
Horse-breeding in England and India - and army horses abroad (1906) (14580159299)

Because it is base 4, you cannot use the number five after the point. A measurement of "15.5 hands" is impossible in this system. That notation would actually mean 15 hands and five inches. A horse that is 64 inches high is 16.0 hands, not 15.4. To convert inches to hands, you divide the inches by four. You then place the remainder after the radix point.

Horse-breeding in England and India - and army horses abroad (1906) (14580159299)
Horse-breeding in England and India - and army horses abroad (1906) (14580159299)

Measuring with the body is an ancient practice. This is known as an anthropic unit. In Ancient Egypt, people used parts of the human body for length. They used the palm, the hand, or a clenched fist. The royal cubit was a large unit divided into seven palms. Each palm was made of four digits, or fingers. An Egyptian hand was about 94 mm wide. A closed fist was about 108 mm.

In the United Kingdom, the hand was standardized by law. King Henry VIII passed the Horses Act in 1540. This act helped define the unit for horses. Before this, there was much confusion. Some dictionaries in 1706 said a hand was four inches. Others said a handbreadth was only three inches. In 1959, the adoption of the international inch helped create a standard imperial form. This allowed for easier metric conversions.

Today, different regions use different systems for equines. Most of continental Europe uses metric units like meters or centimeters. The Fédération Équestre Internationale regulates international competitions. In South Africa, people may use both hands and centimeters. In Australia, regulations require both measurements to be provided. For smaller animals like ponies or donkeys, many people use inches instead of hands. This helps provide more detail for smaller heights.

Horse-breeding in England and India - and army horses abroad (1906) (14580159299)
Horse-breeding in England and India - and army horses abroad (1906) (14580159299)
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