Arm span or reach (sometimes referred to as

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the opposite wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingsp ...

, or spelled armspan) is the physical measurement of the length from one end of an individual's arms (measured at the

finger A finger is a prominent digit (anatomy), digit on the forelimbs of most tetrapod vertebrate animals, especially those with prehensile extremities (i.e. hands) such as humans and other primates. Most tetrapods have five digits (dactyly, pentadact ...

tips) to the other when raised parallel to the ground at

shoulder The human shoulder is made up of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone) as well as associated muscles, ligaments and tendons. The articulations between the bones of the shoulder m ...

height at a 90° angle. The arm span measurement is usually very close to the person's height. Age, sex, and ethnicity have to be taken into account to best predict height from arm span. Arm span is sometimes used when a height measurement is needed but the individual cannot stand on a traditional stadiometer or against a wall due to abnormalities of the back or legs, such as

scoliosis Scoliosis (: scolioses) is a condition in which a person's Vertebral column, spine has an irregular curve in the coronal plane. The curve is usually S- or C-shaped over three dimensions. In some, the degree of curve is stable, while in others ...

osteoporosis Osteoporosis is a systemic skeletal disorder characterized by low bone mass, micro-architectural deterioration of bone tissue leading to more porous bone, and consequent increase in Bone fracture, fracture risk. It is the most common reason f ...

amputation Amputation is the removal of a Limb (anatomy), limb or other body part by Physical trauma, trauma, medical illness, or surgery. As a surgical measure, it is used to control pain or a disease process in the affected limb, such as cancer, malign ...

s, or those who are confined to a bed or wheelchair. Other, possibly more accurate measuring techniques include knee length or recumbent length when possible. Because any decrease in height will cause an increase in the ratio of arm span to height, a large span to height ratio may sometimes be an indicator of a health problem that caused a vertical height loss such as postural changes due to ageing or any spinal conditions such as

Degenerative Disc Disease Degenerative disc disease (DDD) is a medical condition typically brought on by the aging process in which there are anatomic changes and possibly a loss of function of one or more intervertebral discs of the vertebral column, spine. DDD can take ...

Arm span in sports

An above-average reach may be advantageous in sports such as

Australian rules football Australian football, also called Australian rules football or Aussie rules, or more simply football or footy, is a contact sport played between two teams of 18 players on an Australian rules football playing field, oval field, often a modified ...

basketball Basketball is a team sport in which two teams, most commonly of five players each, opposing one another on a rectangular Basketball court, court, compete with the primary objective of #Shooting, shooting a basketball (ball), basketball (appro ...

tennis Tennis is a List of racket sports, racket sport that is played either individually against a single opponent (singles (tennis), singles) or between two teams of two players each (doubles (tennis), doubles). Each player uses a tennis racket st ...

boxing Boxing is a combat sport and martial art. Taking place in a boxing ring, it involves two people – usually wearing protective equipment, such as boxing glove, protective gloves, hand wraps, and mouthguards – throwing Punch (combat), punch ...

mixed martial arts Mixed martial arts (MMA) is a full-contact fighting combat sport, sport based on strike (attack), striking and grappling; incorporating techniques from various combat sports from around the world. In the early 20th century, various inter-s ...

volleyball Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules. It has been a part of the official program of the Summ ...

discus throw The discus throw (), also known as disc throw, is a track and field sport in which the participant athlete throws an oblate spheroid weight (object), weight called a discus in an attempt to mark a further distance than other competitors. It is a ...

fencing Fencing is a combat sport that features sword fighting. It consists of three primary disciplines: Foil (fencing), foil, épée, and Sabre (fencing), sabre (also spelled ''saber''), each with its own blade and set of rules. Most competitive fe ...

rock climbing Rock climbing is a climbing sports discipline that involves ascending climbing routes, routes consisting of natural rock in an outdoor environment, or on artificial resin climbing walls in a mostly indoor environment. Routes are documented in c ...

, and

swimming Swimming is the self-propulsion of a person through water, such as saltwater or freshwater environments, usually for recreation, sport, exercise, or survival. Swimmers achieve locomotion by coordinating limb and body movements to achieve hydrody ...

. For instance, boxer

Sonny Liston Charles L. "Sonny" Liston ( – December 30, 1970), nicknamed "the Big Bear", was an American professional boxer who competed from 1953 to 1970. A dominant contender of his era, he became the undisputed world heavyweight champion in 1962 after k ...

, while 185 cm (6 ft 1 in) tall, had a reach of 213 cm (7 ft 0 in). Another example is current UFC Heavyweight and former UFC Light Heavyweight Champion

Jon Jones Jonathan Dwight Jones (born July 19, 1987) is an American professional mixed martial arts, mixed martial artist. He currently competes in the Heavyweight (MMA), Heavyweight division of the Ultimate Fighting Championship (UFC), where he is the ...

, who is 193 cm (6 ft 4 in) tall, but has an advantageous reach of 215 cm (7 ft 0.5 in). This unusually long reach has allowed them to hit from relatively safe distances where opposing fighters cannot hit back. However, a long arm span is mechanically disadvantageous on the bench press.

Procedure

The most common and easily accessible method of measuring armspan uses the demi-span. Using a

tape measure A tape measure or measuring tape is a long, flexible ruler used to measure length or distance. It usually consists of a ribbon of cloth, plastic, fibreglass, or metal (usually - hard steel alloy) strip with linear measurement markings. Types Ta ...

, measure from the individual's sternal notch (center of the breastbone) to their middle finger as it is stretched out to one side, then double the demi-span for the actual armspan measurement. Demi-span is used because measuring from fingertip to fingertip is difficult, requiring two people or markings on a wall.

Height estimation

For bed-ridden patients, direct measurement of height is typically impractical. Since on average, a person's arm-span and height are equal, the measured span may be used as a good estimate of height.

Arm span in sports

Procedure

Height estimation

See also

References

Further reading