Body surface area

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If height is unknown

For body weight under 40 kg

Body Weight (kg)Surface area (m2)
10.10
1.50.13
20.16
2.50.19
30.21
3.50.24
40.26
4.50.28
50.30
5.50.32
60.34
6.50.36
70.38
7.50.40
80.42
8.50.44
90.46
9.50.47
100.49
110.53
120.56
130.59
140.62
150.65
160.68
170.71
180.74
190.77
200.79
210.82
220.85
230.87
240.90
250.92
260.95
270.97
281.0
291.0
301.1
311.1
321.1
331.1
341.1
351.2
361.2
371.2
381.2
391.3
401.3

This table was calculated using the Boyd equation

For body weight over 40 kg

Body weight (kg)Surface area (m2)
411.3
421.3
431.3
441.4
451.4
461.4
471.4
481.4
491.5
501.5
511.5
521.5
531.5
541.6
551.6
561.6
571.6
581.6
591.7
601.7
611.7
621.7
631.7
641.7
651.8
661.8
671.8
681.8
691.8
701.9
711.9
721.9
731.9
741.9
751.9
762.0
772.0
782.0
792.0
802.0
812.0
822.1
832.1
842.1
852.1
862.1
872.1
882.2
892.2
902.2

This table was calculated using the Boyd equation

 

If the height is known

Use Royal Children’s Hospital, Melbourne’s BSA calculator.

 

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