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Calculator: Body mass index (BMI) for males (2 to 20 years) (Patient education)


Calculator: Body mass index (BMI) for males (2 to 20 years) (Patient education)

 
BMI is a measure of weight in relation to height. It is the most practical way to estimate if a person is underweight, healthy weight, overweight, or obese. For children and adolescents, BMI normally increases with age, so overweight and obesity are defined by percentiles.
 
Enter the child's age, height, and weight
 
Age  
Height  
Weight  

 
Results
 
Important: Inputs must be complete to perform calculation.

 
 
BMI   kg/m2
BMI percentile  
 

 

 

BMI percentile interpretation

 
BMI percentile <5: Underweight
BMI percentile ≥5 and <85: Healthy weight
BMI percentile ≥85 and <95: Overweight
BMI percentile ≥95: Obesity

 
 

 

 

 
Notes
  • At the extremes (>97th percentile or <3rd percentile), small differences in percentiles represent clinically important differences. At these extremes, the Z-score is a more precise reflection of how far the measurement deviates from the mean and is a useful tool for tracking changes.
  • The accuracy of the calculation can be assessed by viewing the graph of body mass index-for-age percentiles for this sex and age group in UpToDate.
  • For all LMS tables, the row in the table corresponding to the patient-specific value is found in the first column of the table; values to be used for L (the Box-Cox power), M (the median), and S (the generalized coefficient of variation) in the equation for Z-score are retrieved.
  • Z-scores may be used to do a table lookup for the corresponding percentile in the Normal table percentiles for Z-score table (below). Numbers along the left side (Y-axis) of the table represent the first number and first decimal place of the Z-score, while the numbers along the top (X-axis) of the table represent the second decimal position of the Z-score.

 
Equations used
 
Below is the math that this calculator used to get the result.
 
BMI = (Weight/2.205) / (Height/39.37)2
Age_Months = Age * 12
Z_Score = ((BMI/M)L - 1) / (L * S)
BMI_percentile = ZtoPercentile(Z_Score)

 

 

LMS table: Body mass index-for-age percentiles, males, 2 to 20 years, CDC growth charts

 
Age [months] Power [L] Median [M] Variation [S]
24.5 -1.982373595 16.54777487 0.080127429
25.5 -1.924100169 16.49442763 0.079233994
26.5 -1.86549793 16.44259552 0.078389356
27.5 -1.807261899 16.3922434 0.077593501
28.5 -1.750118905 16.34333654 0.076846462
29.5 -1.69481584 16.29584097 0.076148308
30.5 -1.642106779 16.24972371 0.075499126
31.5 -1.592744414 16.20495268 0.074898994
32.5 -1.547442391 16.16149871 0.074347997
33.5 -1.506902601 16.11933258 0.073846139
34.5 -1.471770047 16.07842758 0.07339337
35.5 -1.442628957 16.03875896 0.072989551
36.5 -1.419991255 16.00030401 0.072634432
37.5 -1.404277619 15.96304277 0.072327649
38.5 -1.39586317 15.92695418 0.07206864
39.5 -1.394935252 15.89202582 0.071856805
40.5 -1.401671596 15.85824093 0.071691278
41.5 -1.416100312 15.82558822 0.071571093
42.5 -1.438164899 15.79405728 0.071495113
43.5 -1.467669032 15.76364255 0.071462106
44.5 -1.504376347 15.73433668 0.071470646
45.5 -1.547942838 15.70613566 0.071519218
46.5 -1.597896397 15.67904062 0.071606277
47.5 -1.653732283 15.65305192 0.071730167
48.5 -1.714869347 15.62817269 0.071889214
49.5 -1.780673181 15.604408 0.072081737
50.5 -1.850468473 15.58176458 0.072306081
51.5 -1.923551865 15.56025067 0.072560637
52.5 -1.999220429 15.5398746 0.07284384
53.5 -2.076707178 15.52064993 0.073154324
54.5 -2.155348017 15.50258427 0.073490667
55.5 -2.234438552 15.48568973 0.073851672
56.5 -2.313321723 15.46997718 0.074236235
57.5 -2.391381273 15.45545692 0.074643374
58.5 -2.468032491 15.44213961 0.075072264
59.5 -2.542781541 15.43003207 0.075522104
60.5 -2.61516595 15.41914163 0.07599225
61.5 -2.684789516 15.40947356 0.076482128
62.5 -2.751316949 15.40103139 0.076991232
63.5 -2.81445945 15.39381785 0.077519149
64.5 -2.87402476 15.38783094 0.07806539
65.5 -2.92984048 15.38306945 0.078629592
66.5 -2.981796828 15.37952958 0.079211369
67.5 -3.029831343 15.37720582 0.079810334
68.5 -3.073924224 15.37609107 0.080426086
69.5 -3.114093476 15.37617677 0.081058206
70.5 -3.15039004 15.37745304 0.081706249
71.5 -3.182893018 15.37990886 0.082369741
72.5 -3.21170511 15.38353217 0.083048178
73.5 -3.23694834 15.38831005 0.083741021
74.5 -3.25876011 15.39422883 0.0844477
75.5 -3.277281546 15.40127496 0.085167651
76.5 -3.292683774 15.40943252 0.085900184
77.5 -3.305124073 15.41868691 0.086644667
78.5 -3.314768951 15.42902273 0.087400421
79.5 -3.321785992 15.44042439 0.088166744
80.5 -3.326345795 15.45287581 0.088942897
81.5 -3.328602731 15.46636218 0.089728202
82.5 -3.328725277 15.48086704 0.090521875
83.5 -3.32687018 15.49637465 0.091323162
84.5 -3.323188896 15.51286936 0.092131305
85.5 -3.317827016 15.53033563 0.092945544
86.5 -3.310923871 15.54875807 0.093765118
87.5 -3.302612272 15.56812143 0.09458927
88.5 -3.293018361 15.58841065 0.095417247
89.5 -3.282260813 15.60961101 0.096248301
90.5 -3.270454609 15.63170735 0.097081694
91.5 -3.257703616 15.65468563 0.097916698
92.5 -3.244108214 15.67853139 0.098752593
93.5 -3.229761713 15.70323052 0.099588675
94.5 -3.214751287 15.72876911 0.100424251
95.5 -3.199158184 15.75513347 0.101258643
96.5 -3.18305795 15.78231007 0.102091189
97.5 -3.166520664 15.8102856 0.102921245
98.5 -3.1496103 15.83904708 0.103748189
99.5 -3.132389637 15.86858123 0.104571386
100.5 -3.114911153 15.89887562 0.105390269
101.5 -3.097226399 15.92991765 0.106204258
102.5 -3.079383079 15.96169481 0.107012788
103.5 -3.061423765 15.99419489 0.107815327
104.5 -3.043386071 16.02740607 0.108611374
105.5 -3.025310003 16.0613159 0.109400388
106.5 -3.007225737 16.09591292 0.110181915
107.5 -2.989164598 16.13118532 0.110955478
108.5 -2.971148225 16.16712234 0.111720691
109.5 -2.953208047 16.20371168 0.112477059
110.5 -2.935363951 16.24094239 0.1132242
111.5 -2.917635157 16.27880346 0.113961734
112.5 -2.900039803 16.31728385 0.114689291
113.5 -2.882593796 16.35637267 0.115406523
114.5 -2.865311266 16.39605916 0.116113097
115.5 -2.848204697 16.43633265 0.116808702
116.5 -2.831285052 16.47718256 0.117493042
117.5 -2.81456189 16.51859843 0.11816584
118.5 -2.79804347 16.56056987 0.118826835
119.5 -2.781736856 16.60308661 0.119475785
120.5 -2.765648008 16.64613844 0.120112464
121.5 -2.749782197 16.68971518 0.120736656
122.5 -2.734142443 16.73380695 0.121348181
123.5 -2.718732873 16.77840363 0.121946849
124.5 -2.703555506 16.82349538 0.122532501
125.5 -2.688611957 16.86907238 0.123104991
126.5 -2.673903164 16.91512487 0.123664186
127.5 -2.659429443 16.96164317 0.124209969
128.5 -2.645190534 17.00861766 0.124742239
129.5 -2.631185649 17.05603879 0.125260905
130.5 -2.617413511 17.10389705 0.125765895
131.5 -2.603872392 17.15218302 0.126257147
132.5 -2.590560148 17.20088732 0.126734613
133.5 -2.577474253 17.25000062 0.12719826
134.5 -2.564611831 17.29951367 0.127648067
135.5 -2.551969684 17.34941726 0.128084023
136.5 -2.539539972 17.39970308 0.128506192
137.5 -2.527325681 17.45036072 0.128914497
138.5 -2.515320235 17.50138161 0.129309001
139.5 -2.503519447 17.55275674 0.129689741
140.5 -2.491918934 17.60447714 0.130056765
141.5 -2.480514136 17.6565339 0.130410133
142.5 -2.469300331 17.70891811 0.130749913
143.5 -2.458272656 17.76162094 0.131076187
144.5 -2.447426113 17.81463359 0.131389042
145.5 -2.436755595 17.86794729 0.131688579
146.5 -2.426255887 17.92155332 0.131974905
147.5 -2.415921689 17.97544299 0.132248138
148.5 -2.405747619 18.02960765 0.132508403
149.5 -2.395728233 18.08403868 0.132755834
150.5 -2.385858029 18.1387275 0.132990575
151.5 -2.376131459 18.19366555 0.133212776
152.5 -2.366542942 18.24884431 0.133422595
153.5 -2.357086871 18.3042553 0.133620197
154.5 -2.347757625 18.35989003 0.133805756
155.5 -2.338549576 18.41574009 0.133979452
156.5 -2.3294571 18.47179706 0.13414147
157.5 -2.320474586 18.52805255 0.134292005
158.5 -2.311596446 18.5844982 0.134431256
159.5 -2.302817124 18.64112567 0.134559427
160.5 -2.294131107 18.69792663 0.134676731
161.5 -2.285532933 18.75489278 0.134783385
162.5 -2.277017201 18.81201584 0.134879611
163.5 -2.268578584 18.86928753 0.134965637
164.5 -2.260211837 18.92669959 0.135041695
165.5 -2.251911809 18.98424378 0.135108024
166.5 -2.243673453 19.04191185 0.135164867
167.5 -2.235491842 19.09969557 0.135212469
168.5 -2.227362173 19.15758672 0.135251083
169.5 -2.21927979 19.21557707 0.135280963
170.5 -2.211240187 19.27365839 0.135302371
171.5 -2.203239029 19.33182247 0.135315568
172.5 -2.195272161 19.39006106 0.135320824
173.5 -2.187335625 19.44836594 0.135318407
174.5 -2.179425674 19.50672885 0.135308594
175.5 -2.171538789 19.56514153 0.135291662
176.5 -2.163671689 19.62359571 0.135267891
177.5 -2.155821357 19.6820831 0.135237567
178.5 -2.147985046 19.74059538 0.135200976
179.5 -2.140160305 19.7991242 0.135158409
180.5 -2.132344989 19.85766121 0.135110159
181.5 -2.124537282 19.916198 0.135056522
182.5 -2.116735712 19.97472615 0.134997797
183.5 -2.108939167 20.03323719 0.134934285
184.5 -2.10114692 20.09172262 0.134866291
185.5 -2.093358637 20.15017387 0.134794121
186.5 -2.085574403 20.20858236 0.134718085
187.5 -2.077794735 20.26693944 0.134638494
188.5 -2.070020599 20.32523642 0.134555663
189.5 -2.062253431 20.38346455 0.13446991
190.5 -2.054495145 20.44161501 0.134381553
191.5 -2.046748156 20.49967894 0.134290916
192.5 -2.039015385 20.5576474 0.134198323
193.5 -2.031300282 20.6155114 0.134104101
194.5 -2.023606828 20.67326189 0.134008581
195.5 -2.015942013 20.73088905 0.133912066
196.5 -2.008305745 20.7883851 0.133814954
197.5 -2.000706389 20.84574003 0.133717552
198.5 -1.993150137 20.90294449 0.1336202
199.5 -1.985643741 20.95998909 0.133523244
200.5 -1.97819451 21.01686433 0.133427032
201.5 -1.970810308 21.07356067 0.133331914
202.5 -1.96349954 21.1300685 0.133238245
203.5 -1.956271141 21.18637813 0.133146383
204.5 -1.949134561 21.24247982 0.13305669
205.5 -1.942099744 21.29836376 0.132969531
206.5 -1.935177101 21.35402009 0.132885274
207.5 -1.92837748 21.40943891 0.132804292
208.5 -1.921712136 21.46461026 0.132726962
209.5 -1.915192685 21.51952414 0.132653664
210.5 -1.908831065 21.57417053 0.132584784
211.5 -1.902639482 21.62853937 0.132520711
212.5 -1.896630358 21.68262062 0.132461838
213.5 -1.890816268 21.73640419 0.132408563
214.5 -1.885209876 21.78988003 0.132361289
215.5 -1.879823505 21.84303819 0.132320427
216.5 -1.874670324 21.8958685 0.132286382
217.5 -1.869760299 21.94836168 0.1322596
218.5 -1.865113245 22.00050569 0.132240418
219.5 -1.860734944 22.05229242 0.13222933
220.5 -1.85663384 22.10371305 0.132226801
221.5 -1.852827186 22.15475603 0.132233201
222.5 -1.849323204 22.20541249 0.132248993
223.5 -1.846131607 22.255673 0.132274625
224.5 -1.843261294 22.30552831 0.132310549
225.5 -1.840720248 22.3549693 0.132357221
226.5 -1.83851544 22.40398706 0.132415103
227.5 -1.83665586 22.45257182 0.132484631
228.5 -1.835138046 22.50071778 0.132566359
229.5 -1.833972004 22.54841437 0.132660699
230.5 -1.833157751 22.59565422 0.132768153
231.5 -1.83269562 22.64242956 0.132889211
232.5 -1.832584342 22.68873292 0.133024368
233.5 -1.832820974 22.73455713 0.133174129
234.5 -1.833400825 22.7798953 0.133338999
235.5 -1.834317405 22.82474087 0.133519496
236.5 -1.83555752 22.86908912 0.133716192
237.5 -1.837119466 22.91293151 0.133929525
238.5 -1.838987063 22.95626373 0.134160073
239.5 -1.841146139 22.99908062 0.134408381
240.5 -1.843580575 23.04137734 0.134675001

 

LMS table: Normal table percentiles for Z-score

 
Z 0 1 2 3 4 5 6 7 8 9
-3.0 0.13% 0.13% 0.13% 0.12% 0.12% 0.11% 0.11% 0.11% 0.10% 0.10%
-2.9 0.19% 0.18% 0.18% 0.17% 0.16% 0.16% 0.15% 0.15% 0.14% 0.14%
-2.8 0.26% 0.25% 0.24% 0.23% 0.23% 0.22% 0.21% 0.21% 0.20% 0.19%
-2.7 0.35% 0.34% 0.33% 0.32% 0.31% 0.30% 0.29% 0.28% 0.27% 0.26%
-2.6 0.47% 0.45% 0.44% 0.43% 0.41% 0.40% 0.39% 0.38% 0.37% 0.36%
-2.5 0.62% 0.60% 0.59% 0.57% 0.55% 0.54% 0.52% 0.51% 0.49% 0.48%
-2.4 0.82% 0.80% 0.78% 0.75% 0.73% 0.71% 0.70% 0.68% 0.66% 0.64%
-2.3 1.07% 1.04% 1.02% 0.99% 0.96% 0.94% 0.91% 0.89% 0.87% 0.84%
-2.2 1.39% 1.36% 1.32% 1.29% 1.26% 1.22% 1.19% 1.16% 1.13% 1.10%
-2.1 1.79% 1.74% 1.70% 1.66% 1.62% 1.58% 1.54% 1.50% 1.46% 1.43%
-2.0 2.28% 2.22% 2.17% 2.12% 2.07% 2.02% 1.97% 1.92% 1.88% 1.83%
-1.9 2.87% 2.81% 2.74% 2.68% 2.62% 2.56% 2.50% 2.44% 2.39% 2.33%
-1.8 3.59% 3.52% 3.44% 3.36% 3.29% 3.22% 3.14% 3.07% 3.01% 2.94%
-1.7 4.46% 4.36% 4.27% 4.18% 4.09% 4.01% 3.92% 3.84% 3.75% 3.67%
-1.6 5.48% 5.37% 5.26% 5.16% 5.05% 4.95% 4.85% 4.75% 4.65% 4.55%
-1.5 6.68% 6.55% 6.43% 6.30% 6.18% 6.06% 5.94% 5.82% 5.71% 5.59%
-1.4 8.08% 7.93% 7.78% 7.64% 7.49% 7.35% 7.22% 7.08% 6.94% 6.81%
-1.3 9.68% 9.51% 9.34% 9.18% 9.01% 8.85% 8.69% 8.53% 8.38% 8.23%
-1.2 11.51% 11.31% 11.12% 10.94% 10.75% 10.57% 10.38% 10.20% 10.03% 9.85%
-1.1 13.57% 13.35% 13.14% 12.92% 12.71% 12.51% 12.30% 12.10% 11.90% 11.70%
-1.0 15.87% 15.63% 15.39% 15.15% 14.92% 14.69% 14.46% 14.23% 14.01% 13.79%
-0.9 18.41% 18.14% 17.88% 17.62% 17.36% 17.11% 16.85% 16.60% 16.35% 16.11%
-0.8 21.19% 20.90% 20.61% 20.33% 20.05% 19.77% 19.49% 19.22% 18.94% 18.67%
-0.7 24.20% 23.89% 23.58% 23.27% 22.97% 22.66% 22.36% 22.07% 21.77% 21.48%
-0.6 27.43% 27.09% 26.76% 26.44% 26.11% 25.79% 25.46% 25.14% 24.83% 24.51%
-0.5 30.85% 30.50% 30.15% 29.81% 29.46% 29.12% 28.77% 28.43% 28.10% 27.76%
-0.4 34.46% 34.09% 33.72% 33.36% 33.00% 32.64% 32.28% 31.92% 31.56% 31.21%
-0.3 38.21% 37.83% 37.45% 37.07% 36.69% 36.32% 35.94% 35.57% 35.20% 34.83%
-0.2 42.07% 41.68% 41.29% 40.91% 40.52% 40.13% 39.74% 39.36% 38.97% 38.59%
-0.1 46.02% 45.62% 45.22% 44.83% 44.43% 44.04% 43.64% 43.25% 42.86% 42.47%
0.0 50.00% 50.40% 50.80% 51.20% 51.60% 51.99% 52.39% 52.79% 53.19% 53.59%
0.1 53.98% 54.38% 54.78% 55.17% 55.57% 55.96% 56.36% 56.75% 57.14% 57.54%
0.2 57.93% 58.32% 58.71% 59.10% 59.48% 59.87% 60.26% 60.64% 61.03% 61.41%
0.3 61.79% 62.17% 62.55% 62.93% 63.31% 63.68% 64.06% 64.43% 64.80% 65.17%
0.4 65.54% 65.91% 66.28% 66.64% 67.00% 67.36% 67.72% 68.08% 68.44% 68.79%
0.5 69.15% 69.50% 69.85% 70.19% 70.54% 70.88% 71.23% 71.57% 71.90% 72.24%
0.6 72.58% 72.91% 73.24% 73.57% 73.89% 74.22% 74.54% 74.86% 75.18% 75.49%
0.7 75.80% 76.12% 76.42% 76.73% 77.04% 77.34% 77.64% 77.94% 78.23% 78.52%
0.8 78.81% 79.10% 79.39% 79.67% 79.96% 80.23% 80.51% 80.79% 81.06% 81.33%
0.9 81.59% 81.86% 82.12% 82.38% 82.64% 82.89% 83.15% 83.40% 83.65% 83.89%
1.0 84.13% 84.38% 84.61% 84.85% 85.08% 85.31% 85.54% 85.77% 85.99% 86.21%
1.1 86.43% 86.65% 86.86% 87.08% 87.29% 87.49% 87.70% 87.90% 88.10% 88.30%
1.2 88.49% 88.69% 88.88% 89.07% 89.25% 89.44% 89.62% 89.80% 89.97% 90.15%
1.3 90.32% 90.49% 90.66% 90.82% 90.99% 91.15% 91.31% 91.47% 91.62% 91.77%
1.4 91.92% 92.07% 92.22% 92.36% 92.51% 92.65% 92.79% 92.92% 93.06% 93.19%
1.5 93.32% 93.45% 93.57% 93.70% 93.82% 93.94% 94.06% 94.18% 94.30% 94.41%
1.6 94.52% 94.63% 94.74% 94.85% 94.95% 95.05% 95.15% 95.25% 95.35% 95.45%
1.7 95.54% 95.64% 95.73% 95.82% 95.91% 95.99% 96.08% 96.16% 96.25% 96.33%
1.8 96.41% 96.49% 96.56% 96.64% 96.71% 96.78% 96.86% 96.93% 97.00% 97.06%
1.9 97.13% 97.19% 97.26% 97.32% 97.38% 97.44% 97.50% 97.56% 97.62% 97.67%
2.0 97.73% 97.78% 97.83% 97.88% 97.93% 97.98% 98.03% 98.08% 98.12% 98.17%
2.1 98.21% 98.26% 98.30% 98.34% 98.38% 98.42% 98.46% 98.50% 98.54% 98.57%
2.2 98.61% 98.65% 98.68% 98.71% 98.75% 98.78% 98.81% 98.84% 98.87% 98.90%
2.3 98.93% 98.96% 98.98% 99.01% 99.04% 99.06% 99.09% 99.11% 99.13% 99.16%
2.4 99.18% 99.20% 99.22% 99.25% 99.27% 99.29% 99.31% 99.32% 99.34% 99.36%
2.5 99.38% 99.40% 99.41% 99.43% 99.45% 99.46% 99.48% 99.49% 99.51% 99.52%
2.6 99.53% 99.55% 99.56% 99.57% 99.59% 99.60% 99.61% 99.62% 99.63% 99.64%
2.7 99.65% 99.66% 99.67% 99.68% 99.69% 99.70% 99.71% 99.72% 99.73% 99.74%
2.8 99.74% 99.75% 99.76% 99.77% 99.77% 99.78% 99.79% 99.80% 99.80% 99.81%
2.9 99.81% 99.82% 99.83% 99.83% 99.84% 99.84% 99.85% 99.85% 99.86% 99.86%
3.0 99.87% 99.87% 99.87% 99.88% 99.88% 99.89% 99.89% 99.89% 99.90% 99.90%
Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

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Topic 13431 Version 15.0