Research
How Many Sweat Glands Does the Human Body Have?
The human body has roughly 2 to 4 million eccrine sweat glands, the small coiled glands responsible for most thermoregulatory sweating. They are spread across almost the entire skin surface, but not evenly: density is highest on the fingers, palms and soles and much lower on areas such as the upper lip. One detailed analysis estimated that a standardized adult (1.8 m2 of skin) carries about 2.0 million functional eccrine glands. This page compiles the verified counts and the regional density gradient, with every figure traced to its source.
By the Sweat Explained Editorial Team · Published 2026-07-13 · Last reviewed 2026-07-13 · Educational information, not medical advice.
Key statistics at a glance
2-4 million
eccrine sweat glands in the human body (typical estimate)
Baker 2019; StatPearls
~2.03 million
functional eccrine glands for a standardized 1.8 m2 adult (95% CI 1.72-2.34 million)
Taylor & Machado-Moreira 2013
~530 /cm2
highest eccrine gland density, on the volar (palm-side) surfaces of the fingers
Taylor & Machado-Moreira 2013
~16 /cm2
lowest eccrine gland density, on the upper lip
Taylor & Machado-Moreira 2013
How many sweat glands does the body have?
The commonly cited figure is that humans have about 2 to 4 million eccrine sweat glands distributed across nearly the whole body surface. Eccrine glands open directly onto the skin and produce the watery sweat used for temperature regulation; they are the type responsible for most of what people think of as sweating.
A 2013 synthesis of more than a century and a half of anatomical measurements put a sharper number on it: for a standardized individual with 1.8 m2 of skin, the body carries an estimated 2.03 million functional eccrine glands, with a 95% confidence interval of 1.72 to 2.34 million. That estimate sits at the lower end of the classic 2-4 million range, and it counts only glands that are actually secreting.
A second gland type, the apocrine glands, is far more limited. Rather than covering the whole body, apocrine glands are concentrated in specific areas such as the armpits, the groin and anogenital region, the areola, and the external ear canal, and they open into hair follicles rather than directly onto the skin. Because their distribution is restricted, apocrine glands make up only a small share of the body's total sweat glands.
Sweat gland density varies widely by body region
Glands are not spread evenly. A regional analysis found more than a thirty-fold difference between the most and least densely covered skin: density is highest on the fingers, palms and soles and lowest on areas such as the upper lip. The values below are representative regional means in glands per square centimetre.
| Group | Value |
|---|---|
| Fingers (volar) | 530% |
| Sole | 294% |
| Palm | 241% |
| Hand (dorsal) | 176% |
| Forearm (ventral) | 159% |
| Forehead | 155% |
| Abdomen | 141% |
| Thigh (anterior) | 122% |
| Cheek | 113% |
| Back (scapula) | 106% |
| Chest | 91% |
| Upper lip | 16% |
Source: Taylor & Machado-Moreira, Extreme Physiol Med 2013. Chart is an original rendering of the cited data.
Why palms and soles have the most glands
The palms and soles, along with the volar surfaces of the fingers, carry the densest concentration of eccrine glands. This is why the hands and feet can feel disproportionately sweaty even though they make up a small fraction of total skin area, and why palm and sole sweating is such a prominent feature of focal excessive sweating.
High gland density in one region does not automatically mean it produces the most total sweat during heat or exercise. Density and secretion rate are different measurements: the trunk and limbs, with lower density but far larger surface area, contribute a large share of whole-body sweat output during thermal load. Sweat rate per gland also varies by site and situation, so a dense region is not always the wettest one.
What these numbers do and don't tell you
The plain-language summary: almost everyone has a similar order of magnitude of eccrine glands, roughly two to four million, and the number is largely fixed by early childhood. What differs from person to person is not usually a dramatically different gland count but how strongly and where those glands are activated. Having a high gland density on the palms is normal anatomy shared by everyone; excessive sweating is about gland output and nervous-system signaling, not about having extra glands.
If sweating is heavy enough to interfere with daily activities, work or sleep, that is a reason to speak with a clinician, who can distinguish ordinary sweating from conditions that warrant evaluation. Nothing on this page is a diagnosis or medical advice.
Methodology and limitations
This page draws on a peer-reviewed anatomical synthesis (Taylor & Machado-Moreira, Extreme Physiology & Medicine, 2013) for the total functional gland estimate and the regional density figures, and on a comprehensive physiology review (Baker, Temperature, 2019) plus StatPearls for the general 2-4 million range and the eccrine/apocrine distinction. Each figure was traced to its source and confirmed.
Limitations: gland-density measurements come from different anatomical studies using different counting methods and body sites, so regional values are best read as representative means rather than exact universal constants. The 2.03 million total is modeled for a standardized 1.8 m2 individual and counts functional (secreting) glands; the broader 2-4 million range reflects a mix of total and functional counts across the older literature. Gland density does not equal sweat output. This page is general education, not a diagnosis or medical advice.
Frequently asked questions
- How many sweat glands does the human body have?
- Roughly 2 to 4 million eccrine sweat glands is the commonly cited figure. A 2013 anatomical synthesis estimated about 2.03 million functional eccrine glands for a standardized 1.8 m2 adult (95% confidence interval 1.72-2.34 million).
- Where are sweat glands most concentrated?
- On the volar (palm-side) surfaces of the fingers, the palms and the soles. Reported density reaches about 530 glands per cm2 on the fingers, versus about 241 on the palm and 294 on the sole, and as low as roughly 16 per cm2 on the upper lip (Taylor & Machado-Moreira 2013).
- What is the difference between eccrine and apocrine glands?
- Eccrine glands cover almost the entire body, open directly onto the skin, and produce the watery sweat used for cooling. Apocrine glands are limited to areas such as the armpits, groin, areola and ear canal, open into hair follicles, and make up only a small share of total sweat glands.
- Do people with excessive sweating have more sweat glands?
- Not typically. Most people have a similar number of eccrine glands. Excessive sweating generally reflects how strongly the glands are activated by the nervous system, not a larger gland count. Persistent, disruptive sweating is worth discussing with a clinician.
- Does the region with the most glands sweat the most?
- Not necessarily. Gland density and sweat output are separate measurements. The palms are very dense, but during heat or exercise the trunk and limbs contribute a large share of total sweat because of their much greater surface area.
Sources
Primary peer-reviewed studies and official sources first, then reviews and institutional framing (secondary).
- Taylor NAS, Machado-Moreira CA. Regional variations in transepidermal water loss, eccrine sweat gland density, sweat secretion rates and electrolyte composition in resting and exercising humans. Extreme Physiol Med. 2013;2:4. Full text
- Baker LB. Physiology of sweat gland function: the roles of sweating and sweat composition in human health. Temperature (Austin). 2019;6(3):211-259. Full text
- Hodge BD, Sanvictores T, Brodell RT. Anatomy, Skin, Sudoriferous Gland. StatPearls. Treasure Island (FL): StatPearls Publishing. StatPearls
How to cite this page
Sweat Explained. How Many Sweat Glands Does the Human Body Have?. Published 2026-07-13; last reviewed 2026-07-13. Available at: https://sweatexplained.com/research/how-many-sweat-glands-does-the-body-have
Please cite the original studies for the underlying figures. Journalists are welcome to link to this page; the charts are original renderings of the cited data.