Find the formula for calculating the surface area of the human body

a) Calculate the surface area of the human body.

There are many formulas, but most of them can be written in the form of (1) or (2).

sa=chα1wα2

1) Here sa is the surface area of the human body (m2); h is the height (cm); w is body weight (kg); c, 1, 2 are constant terms.

The natural logarithm is taken on both sides of the equation.

Equation (1) can be linearized as:

lnsa=α0+α1lnh+α2lnw

2) where 0=lnc and ln is the natural logarithmic symbol.

In 1916, 9 observers were directly measured by Dubois et al.

height, weight, and body surface area, using the minimum coefficient of variation method.

The first recognized formula for calculating human surface area (1) was established, which is still widely used today. In 1975, Gehan and George used 401 cases of height, weight, and body surface area directly measured by Boyd et al., using the least squares method.

Fit (2) Eq. 1In 1987, Mosteller gave a simple formula (c=1 60) that is easy to remember according to equation (1) 2In 1973, Stevenson proposed a binary linear formula for calculating surface area from height and weight, based on 10 measured data.3 Zhao Songshan et al.4,5 reported the calculation formula for adult men and women in China in the 80s.

The calculation formula introduced in most domestic textbooks is:

sa= (w≤30)

w>30)

2) Xu Wensheng's formula:

Body surface area (m2) = height (cm) + weight (kg).

For example, if a person is 168cm tall and weighs 55kg, try to calculate his body surface area.

Solution: The formula for calculating the body surface area of men and women is: S male = height + weight +, S female = height + weight, if there is no distinction between male and female.

The general formula applicable to Chinese is s = height + weight. (S shows body surface area, unit: m2; h shows height, unit: cm; w shows body weight in kg).

3) Or there is a more stupid method, add a layer of plastic objects to the body surface, stick it on the body, and then take it down to measure the area.

There are many formulas for calculating the surface area of the human body, Xu Wensheng's formula: s= 0128 w-0Before 1529, it was recognized by the academic community, but this formula was calculated more than 60 years ago based on the physical condition of the Chinese people at that time.

More than half a century has passed, and no one has revised it. In 1999, there was a study on the surface area of 100 human populations, and the results showed that this formula was no longer suitable for calculating the body surface area of contemporary Chinese, and at the same time, the general formula applicable to the new Chinese was given: s=0

0061×h+0. 0124×w-0. 0099

There is a table in the "Handbook of Clinical Oncology" compiled by Academician Sun Yan, the founder of cancer chemotherapy in China, which contains the body surface area under various height and weight combinations, and the data cited by Academician Sun should be credible 0061×h+0. 0124×w-0.

0099, the result of this formula is closer to the ** data cited by Academician Sun, the difference is about square meters, and the result of Xu Wensheng's formula is far from the ** data. Therefore, I personally think: s=0

0061×h+0. 0124×w-0.0099, relatively accurate.

Note: H in the formula is height in centimeters and w is weight in kilograms.

In addition, there is a simplified formula: s = height and weight divided by 3600, and the resulting value is then found as the square root is the body surface area. It's also very accurate.

Human body surface area calculation method To calculate the body surface area of Chinese people, it is generally believed that Xu Wensheng's formula is more applicable, namely:

Body surface area (m2) = height (cm) + weight (kg) Example: A person is 168cm tall and weighs 55kg, try to calculate his body surface area.

Solution: The formula for calculating the body surface area of men and women is: S male = height + weight +, S female = height + weight, if there is no difference between men and women, the general formula applicable to Chinese is s = height + weight.

(S shows body surface area, unit: m2; h shows height, unit: cm; w shows body weight in kg).

Weight on land - body weight in water = mass of water discharged by the human body. According to the mass = density x volume, the volume of water drained by the human body = water mass The density of water. Because the volume of water expelled by the human body is equal to the volume of the human body, this formula holds.

Because the weight of a person in the water = the weight of the land - buoyancy, where.

Buoyancy = the gravity of the human body to drain the water = the volume of the water to be drained * the density of the water.

The volume of a normal adult: when the human body sinks or floats in the water, the density of the person is equivalent to the density of water, when the specific gravity of water is 1, the density is 1000kg cubic meters, and then divide the mass by the density to get cubic meters. So the normal volume of a person is around the cubic meter.

How to calculate the body surface area:

1. Stare at the body surface area (m2) = height (cm) + weight (kg) - 60, the obtained value divided by 100 is equal to the body surface area. (

2. Body surface area (m2) = height (cm) weight (kg) divided by 3600 to get the square root of the value.

It's the body surface area. (m2) 。

3. The calculation formula introduced by many domestic textbooks is: body surface area (m2) = body weight (kg) - 30 [body weight" 30kg). (Body surface area (m2) = body weight (kg) + body weight 30kg).

4. Mr. Xu Wensheng (Stevenson) formula is generally applicable: the surface area of Kaisan rock mass (m2) = height (cm) + weight (digging kilograms).

The body surface area of men and women is rotten.

The calculation formulas are: male body surface area (m) = height (cm) + weight (kg) +; Female body surface area (m) = height (cm) + weight (kg).

If there is no distinction between men and women.

The general formula applicable to Chinese is body surface area = height (cm) + weight (kg).

The formula for calculating the body surface area of men and women is as follows: male body surface area (m withered) = height (cm) + weight (kg) +.

Let the length, width, and height of a cuboid be a, b, and c, respectively, then its surface area is s = ab+bc+ca) 2, which is also equal to 2ab+2bc+2ca, and is also equal to 2(ab+bc+ca).

History: In 1916, the height, body weight and body surface area of 9 observers were directly measured by Dubois et al., and the first recognized formula for calculating human surface area (1) was established by using the minimum sharp coefficient of variation method, which is still widely used. In 1975, Gehan and George used 401 cases of height, weight, and body surface area directly measured by Boyd et al., and applied least squares fitting formulas.