BSA Calculator

The BSA calculator comprehensively computes the total surface area of a human body, known as Body Surface Area (BSA), utilizing a wide range of BSA formulas. Given the difficulties in direct BSA measurement, various estimation formulas have been developed. This calculator offers results from an extensive array of popular BSA formulas, catering to the needs of healthcare professionals, researchers, and the curious alike. With a user-friendly interface and straightforward inputs, it simplifies the BSA estimation process, making it accessible to all. This tool is vital for medical contexts such as medication dosing, burn injury assessment, and more.

What is Body Surface Area (BSA)?

Body Surface Area (BSA) is a measurement used in many medical tasks, including determining the correct dosages for medications and assessing metabolic mass. It provides a more accurate measure of the body's surface area than simple height and weight measurements.

BSA, superior to body weight, is a precise marker of metabolic mass, which reflects the body's energy requirements. Metabolic mass can be approximated by fat-free mass, excluding non-metabolically active body fat. BSA is widely employed in clinical settings, including for chemotherapy dosing and assessing cardiac function. However, for drugs with a narrow therapeutic range, BSA's accuracy may be questioned, posing a toxicity risk. Additionally, BSA's precision diminishes in extremes of height/weight, where BMI may be preferable. Nevertheless, BSA-guided chemotherapy dosing consistently outperforms weight-based dosing.

All BSA Calculate Formulas

Here are the formulas used for calculating BSA:

Du Bois formula: \( \text{BSA} = 0.007184 \times W^{0.425} \times H^{0.725} \)
Mosteller formula: \( \text{BSA} = 0.016667 \times W^{0.5} \times H^{0.5} \)
Haycock formula: \( \text{BSA} = 0.024265 \times W^{0.5378} \times H^{0.3964} \)
Gehan and George formula: \( \text{BSA} = 0.0235 \times W^{0.51456} \times H^{0.42246} \)
Boyd formula: \( \text{BSA} = 0.03330 \times W^{(0.6157 - 0.0188 \times \log_{10}(W))} \times H^{0.3} \)
Fujimoto formula: \( \text{BSA} = 0.008883 \times W^{0.444} \times H^{0.663} \)
Takahira formula: \( \text{BSA} = 0.007241 \times W^{0.425} \times H^{0.725} \)
Schlich formula for women: \( \text{BSA} = 0.000975482 \times W^{0.46} \times H^{1.08} \)
Schlich formula for men: \( \text{BSA} = 0.000579479 \times W^{0.38} \times H^{1.24} \)

BSA Formula Step by Step Example Calculation

Let's assume the following values:

Weight: 70 kg
Height: 175 cm

Using the formula:

\[ \text{BSA} = 0.007184 \times 70^{0.425} \times 175^{0.725} \]

Calculating step-by-step:

\[ 70^{0.425} \approx 6.08 \]

\[ 175^{0.725} \approx 42.29 \]

\[ \text{BSA} = 0.007184 \times 6.08 \times 42.29 \approx 1.848\, \text{m}^2 \]

The calculated Body Surface Area (BSA) is approximately 1.848 m².

Mean Male BSA by Age

Age or Age Group	BSA (m²)	BSA (ft²)
Neonate (newborn)	0.243	2.612
1 year	0.467	5.027
2 years	0.563	6.060
3 years	0.634	6.824
4 years	0.712	7.664
5 years	0.787	8.471
6 years	0.867	9.332
7 years	0.965	10.387
8 years	1.050	11.302
9 years	1.116	12.013
10 years	1.236	13.304
11 years	1.371	14.757
12 years	1.435	15.446
13 years	1.603	17.255
14 years	1.720	18.514
15 years	1.825	19.644
16 years	1.886	20.301
17 years	1.907	20.527
18 years	1.980	21.313
19 years	1.958	21.076
20-29 years	2.016	21.700
30-39 years	2.072	22.303
40-49 years	2.081	22.340
50-59 years	2.070	22.281
60-69 years	2.065	22.227
70-79 years	1.998	21.506
80+ years	1.920	20.667

Mean Female BSA by Age

Age or Age Group	BSA (m²)	BSA (ft²)
Neonate (newborn)	0.234	2.519
1 year	0.456	4.908
2 years	0.540	5.813
3 years	0.625	6.727
4 years	0.702	7.556
5 years	0.771	8.299
6 years	0.862	9.278
7 years	0.942	10.140
8 years	1.051	11.313
9 years	1.163	12.518
10 years	1.245	13.401
11 years	1.361	14.650
12 years	1.512	16.275
13 years	1.550	16.684
14 years	1.621	17.448
15 years	1.685	18.137
16 years	1.698	18.277
17 years	1.727	18.589
18 years	1.726	18.579
19 years	1.741	18.740
20-29 years	1.790	19.267
30-39 years	1.845	19.859
40-49 years	1.842	19.827
50-59 years	1.840	19.806
60-69 years	1.804	19.418
70-79 years	1.780	19.160
80+ years	1.638	17.631

	BSA (ft²)	BSA (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