Body Surface Area Calculator

Height

Weight

Result
Note! This is not a diagnosis. The calculations that are provided are estimates based on averages.
Bsa	0.00_m²

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BSA Calculator

What is BSA?

Body surface area (BSA) is the method that is mostly used in medicine and physiology. BSA medical is the computed or calculated surface area of a human body.

BSA is one sign that is used mostly for medical purposes to determine the total metabolic mass as compared to body weight and the advantage using BSA is that it is less affected by the abnormal adipose mass.

The values of BSA are used mostly in medicine, mainly used to calculate index cardiac output and doses of chemotherapeutic agents.

Here are some examples:

Renal clearance often divided by the BSA that is per 1.73 m² to gain a rise in the true GFR (glomerular filtration rate)
Glucocorticoid medication are given according to BSA to measure maintenance of medicine doses or used to compare high medicine usage with the maintenance conditions
Chemotherapy dosage is sometimes given according to the value of BSA of the person
The cardiac index is the calculation of cardiac output which is then divided by the BSA, giving a better estimate of the in effect cardiac output.

The average value of BSA

Average BSA changes according to age, height, and weight in a person. The average value in an adult is 1.7 m².

Average value in adult male= 19.2 m²

The average value in an adult female is =16.2 m²

Here is a table for BSA according to age and average values:

Mean male BSA by age
Age or age group	metric		imperial
Neonate (newborn)	0.243	m²	2.612	ft²
2 years	0.563	m²	6.060	ft²
5 years	0.787	m²	6.060	ft²
10 years	1.236	m²	13.304	ft²
13 years	1.603	m²	17.255	ft²
18 years	1.980	m²	21.313	ft²
20-79 years	2.060	m²	22.173	ft²
80+ years	1.920	m²	20.667	ft²

Mean female BSA by age
Age or age group	metric		imperial
Neonate (newborn)	0.234	m²	2.519	ft²
2 years	0.540	m²	5.813	ft²
5 years	0.771	m²	8.299	ft²
10 years	1.245	m²	13.401	ft²
13 years	1.550	m²	16.684	ft²
18 years	1.726	m²	18.579	ft²
20-79 years	1.830	m²	19.697	ft²
80+ years	1.638	m²	17.631	ft²

The table shows the estimations which are based on height and weight. These are the mean values commonly found in people and might change as per the situation.

How to Calculate BSA?

BSA calculations involve various formulas that are used to calculate BSA (m²) by using Weight (kg), height (cm).

Here is a body surface area chart estimating average BSA of adults and children:

	ft²	m²
Newborn child	2.69	0.25
Two-year-old child	5.38	0.5
Ten-year-old child	12.27	1.14
Adult female	17.22	1.6
Adult male	20.45	1.9

You can calculate BSA manually or you can use our Body surface area calculator to speed up the process of calculation with precision the most abundantly used formula to calculate is Du Bois, Du Bois BSA equation which is quite effective while calculating body fat in obese and underweight persons as compared to Body mass index.

Du Bois Formula: {BSA} =0.007184×W^0.425× H^0.725

This formula is simple and easy to remember.

Other BSA formulas in m² include:

Gehan and George: 0.0235 × W^0.51456× H^0.42246

Fujimoto: 0.008883 × W^0.444× H^0.663

Takahira: 0.007241 × W^0.425× H^0.725

Schlich: 0.000975482× W^0.46 × H^1.08(for men)

0.000579479 × W^0.38 × H^1.24(for women)

These are some of the other body surface area formulas that can be used to manually calculate a person’s BSA. These formulas look similar to BMI but there is a significant difference between two which is discussed below.

The other way to find BSA is to use our body surface area calculator.

Online BSA calculator

However, there are multiple formulas that are used to calculate BSA but the easiest and human error-free is to use online tools. Our developers have made this online tool to help people quickly get results rather than putting values in the formula to get desired results.

Our tool is quick and user-friendly, all you need to know is your weight and height and insert them in the provided area in any unit like for height inches, cm, feet, and meters.

After putting the values just click on the Calculate button to get results. You can use the results for further examination by your doctor to check the risks and suggest your medication according to it.

BMI and BSA: Are they different?

People often get confused between both terms although they are quite similar as they both are used to determine Body mass.

Body Surface area and Body mass index are different to some extent that one is used to measure the surface area of a person’s body and the other is used to calculate the degree of obesity in a person.

Furthermore, the formulas are also different:

The SI unit for BSA is m² and unit for BMI is kg/m². These are different terms and should not be confused. Both BSA and BMI are clinically used in different areas and according to the situation.