Body Surface Area in Children
Body-weight under 40 kg
Body-weight
(kg)Surface area
(m^2 )1 0.10
1.5 0.13
2 0.16
2.5 0.19
3 0.21
3.5 0.24
4 0.26
4.5 0.28
5 0.30
5.5 0.32
6 0.34
6.5 0.36
7 0.38
7.5 0.40
80 .42
8.5 0.44
90 .46
9.5 0.47
10 0.49
11 0.53
12 0.56
13 0.59
14 0.62
15 0.65
16 0.68
Body-weight
(kg)Surface area
(m^2 )17 0.71
18 0.74
19 0.77
20 0.79
21 0.82
22 0.85
23 0.87
24 0.90
25 0.92
26 0.95
27 0.97
28 1.0
29 1.0
30 1.1
31 1.1
32 1.1
33 1.1
34 1.1
35 1.2
36 1.2
37 1.2
38 1.2
39 1.3
40 1.3
Values are calculated using the Boyd equation
NoteHeight is not required to estimate body surface using these tables
Adapted by permission from Macmillan Publishers Ltd: Sharkey I et al,British Journal of Cancer2001; 85 (1): 23–28, © 2001