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Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC)


 Calculator: Body mass index (BMI) percentiles and Z-scores, males 2 to 20 years (CDC)

 
Input
 
Age  
Height  
Weight  

 
Results
 
Important: Inputs must be complete to perform calculation.

 
 
BMI   kg/m2     
Z-score  
Percentile  
 
Decimal precision  

 

 

 BMI classification

 
Body mass index (BMI) Classification
BMI <5th percentile: Underweight
BMI ≥5th to <85th percentile: Healthy weight
BMI ≥85th to <95th percentile: Overweight
BMI ≥95th to <120% of the 95th percentile and <35 kg/m2: Class I obesity
BMI ≥120% to <140% of the 95th percentile or ≥35 kg/m2 (whichever is lower): Class II obesity
BMI ≥140% of the 95th percentile or ≥40 kg/m2 (whichever is lower): Class III obesity

 
 

 

 
Notes
  • This calculator is based on the United States Centers for Disease Control and Prevention (CDC) growth reference.
  • Class I represents mild obesity. Class II and Class III represent severe obesity.
  • 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.
  • 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.
  • 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.
  • 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
 
BMI = Weight / (Height/100)2
Z-score = ((BMI/M)L - 1) / (L * S)
Percentile = ZtoPercentile(Z-score)
BMI 95th percentile = M * ((L*S*1.645)+1)(1/L)

 

 
Examples
 
Z-scorePercentile equivalent
+ 1.0
84
+ 2.0
97.5
+ 2.5
99.4
+ 3.0
99.7

 
References
  1. Centers for Disease Control and Prevention, National Center for Health Statistics. Clinical growth charts. https://www.cdc.gov/growthcharts/clinical_charts.htm (Accessed on June 26, 2023).

 

 LMS table: Body mass index-for-age percentiles, males 2 to 20 years, CDC growth reference (United States)

 
Age [months] Power [L] Median [M] Variation [S]
24 -2.0112 16.5750 0.0806
24.5 -1.9824 16.5478 0.0801
25.5 -1.9241 16.4944 0.0792
26.5 -1.8655 16.4426 0.0784
27.5 -1.8073 16.3922 0.0776
28.5 -1.7501 16.3433 0.0768
29.5 -1.6948 16.2958 0.0761
30.5 -1.6421 16.2497 0.0755
31.5 -1.5927 16.2050 0.0749
32.5 -1.5474 16.1615 0.0743
33.5 -1.5069 16.1193 0.0738
34.5 -1.4718 16.0784 0.0734
35.5 -1.4426 16.0388 0.0730
36.5 -1.4200 16.0003 0.0726
37.5 -1.4043 15.9630 0.0723
38.5 -1.3959 15.9270 0.0721
39.5 -1.3949 15.8920 0.0719
40.5 -1.4017 15.8582 0.0717
41.5 -1.4161 15.8256 0.0716
42.5 -1.4382 15.7941 0.0715
43.5 -1.4677 15.7636 0.0715
44.5 -1.5044 15.7343 0.0715
45.5 -1.5479 15.7061 0.0715
46.5 -1.5979 15.6790 0.0716
47.5 -1.6537 15.6531 0.0717
48.5 -1.7149 15.6282 0.0719
49.5 -1.7807 15.6044 0.0721
50.5 -1.8505 15.5818 0.0723
51.5 -1.9236 15.5603 0.0726
52.5 -1.9992 15.5399 0.0728
53.5 -2.0767 15.5206 0.0732
54.5 -2.1553 15.5026 0.0735
55.5 -2.2344 15.4857 0.0739
56.5 -2.3133 15.4700 0.0742
57.5 -2.3914 15.4555 0.0746
58.5 -2.4680 15.4421 0.0751
59.5 -2.5428 15.4300 0.0755
60.5 -2.6152 15.4191 0.0760
61.5 -2.6848 15.4095 0.0765
62.5 -2.7513 15.4010 0.0770
63.5 -2.8145 15.3938 0.0775
64.5 -2.8740 15.3878 0.0781
65.5 -2.9298 15.3831 0.0786
66.5 -2.9818 15.3795 0.0792
67.5 -3.0298 15.3772 0.0798
68.5 -3.0739 15.3761 0.0804
69.5 -3.1141 15.3762 0.0811
70.5 -3.1504 15.3775 0.0817
71.5 -3.1829 15.3799 0.0824
72.5 -3.2117 15.3835 0.0830
73.5 -3.2369 15.3883 0.0837
74.5 -3.2588 15.3942 0.0844
75.5 -3.2773 15.4013 0.0852
76.5 -3.2927 15.4094 0.0859
77.5 -3.3051 15.4187 0.0866
78.5 -3.3148 15.4290 0.0874
79.5 -3.3218 15.4404 0.0882
80.5 -3.3263 15.4529 0.0889
81.5 -3.3286 15.4664 0.0897
82.5 -3.3287 15.4809 0.0905
83.5 -3.3269 15.4964 0.0913
84.5 -3.3232 15.5129 0.0921
85.5 -3.3178 15.5303 0.0929
86.5 -3.3109 15.5488 0.0938
87.5 -3.3026 15.5681 0.0946
88.5 -3.2930 15.5884 0.0954
89.5 -3.2823 15.6096 0.0962
90.5 -3.2705 15.6317 0.0971
91.5 -3.2577 15.6547 0.0979
92.5 -3.2441 15.6785 0.0988
93.5 -3.2298 15.7032 0.0996
94.5 -3.2148 15.7288 0.1004
95.5 -3.1992 15.7551 0.1013
96.5 -3.1831 15.7823 0.1021
97.5 -3.1665 15.8103 0.1029
98.5 -3.1496 15.8390 0.1037
99.5 -3.1324 15.8686 0.1046
100.5 -3.1149 15.8989 0.1054
101.5 -3.0972 15.9299 0.1062
102.5 -3.0794 15.9617 0.1070
103.5 -3.0614 15.9942 0.1078
104.5 -3.0434 16.0274 0.1086
105.5 -3.0253 16.0613 0.1094
106.5 -3.0072 16.0959 0.1102
107.5 -2.9892 16.1312 0.1110
108.5 -2.9711 16.1671 0.1117
109.5 -2.9532 16.2037 0.1125
110.5 -2.9354 16.2409 0.1132
111.5 -2.9176 16.2788 0.1140
112.5 -2.9000 16.3173 0.1147
113.5 -2.8826 16.3564 0.1154
114.5 -2.8653 16.3961 0.1161
115.5 -2.8482 16.4363 0.1168
116.5 -2.8313 16.4772 0.1175
117.5 -2.8146 16.5186 0.1182
118.5 -2.7980 16.5606 0.1188
119.5 -2.7817 16.6031 0.1195
120.5 -2.7656 16.6461 0.1201
121.5 -2.7498 16.6897 0.1207
122.5 -2.7341 16.7338 0.1213
123.5 -2.7187 16.7784 0.1219
124.5 -2.7036 16.8235 0.1225
125.5 -2.6886 16.8691 0.1231
126.5 -2.6739 16.9151 0.1237
127.5 -2.6594 16.9616 0.1242
128.5 -2.6452 17.0086 0.1247
129.5 -2.6312 17.0560 0.1253
130.5 -2.6174 17.1039 0.1258
131.5 -2.6039 17.1522 0.1263
132.5 -2.5906 17.2009 0.1267
133.5 -2.5775 17.2500 0.1272
134.5 -2.5646 17.2995 0.1276
135.5 -2.5520 17.3494 0.1281
136.5 -2.5395 17.3997 0.1285
137.5 -2.5273 17.4504 0.1289
138.5 -2.5153 17.5014 0.1293
139.5 -2.5035 17.5528 0.1297
140.5 -2.4919 17.6045 0.1301
141.5 -2.4805 17.6565 0.1304
142.5 -2.4693 17.7089 0.1307
143.5 -2.4583 17.7616 0.1311
144.5 -2.4474 17.8146 0.1314
145.5 -2.4368 17.8679 0.1317
146.5 -2.4263 17.9216 0.1320
147.5 -2.4159 17.9754 0.1322
148.5 -2.4057 18.0296 0.1325
149.5 -2.3957 18.0840 0.1328
150.5 -2.3859 18.1387 0.1330
151.5 -2.3761 18.1937 0.1332
152.5 -2.3665 18.2488 0.1334
153.5 -2.3571 18.3043 0.1336
154.5 -2.3478 18.3599 0.1338
155.5 -2.3385 18.4157 0.1340
156.5 -2.3295 18.4718 0.1341
157.5 -2.3205 18.5281 0.1343
158.5 -2.3116 18.5845 0.1344
159.5 -2.3028 18.6411 0.1346
160.5 -2.2941 18.6979 0.1347
161.5 -2.2855 18.7549 0.1348
162.5 -2.2770 18.8120 0.1349
163.5 -2.2686 18.8693 0.1350
164.5 -2.2602 18.9267 0.1350
165.5 -2.2519 18.9842 0.1351
166.5 -2.2437 19.0419 0.1352
167.5 -2.2355 19.0997 0.1352
168.5 -2.2274 19.1576 0.1353
169.5 -2.2193 19.2156 0.1353
170.5 -2.2112 19.2737 0.1353
171.5 -2.2032 19.3318 0.1353
172.5 -2.1953 19.3901 0.1353
173.5 -2.1873 19.4484 0.1353
174.5 -2.1794 19.5067 0.1353
175.5 -2.1715 19.5651 0.1353
176.5 -2.1637 19.6236 0.1353
177.5 -2.1558 19.6821 0.1352
178.5 -2.1480 19.7406 0.1352
179.5 -2.1402 19.7991 0.1352
180.5 -2.1323 19.8577 0.1351
181.5 -2.1245 19.9162 0.1351
182.5 -2.1167 19.9747 0.1350
183.5 -2.1089 20.0332 0.1349
184.5 -2.1011 20.0917 0.1349
185.5 -2.0934 20.1502 0.1348
186.5 -2.0856 20.2086 0.1347
187.5 -2.0778 20.2669 0.1346
188.5 -2.0700 20.3252 0.1346
189.5 -2.0623 20.3835 0.1345
190.5 -2.0545 20.4416 0.1344
191.5 -2.0467 20.4997 0.1343
192.5 -2.0390 20.5576 0.1342
193.5 -2.0313 20.6155 0.1341
194.5 -2.0236 20.6733 0.1340
195.5 -2.0159 20.7309 0.1339
196.5 -2.0083 20.7884 0.1338
197.5 -2.0007 20.8457 0.1337
198.5 -1.9932 20.9029 0.1336
199.5 -1.9856 20.9600 0.1335
200.5 -1.9782 21.0169 0.1334
201.5 -1.9708 21.0736 0.1333
202.5 -1.9635 21.1301 0.1332
203.5 -1.9563 21.1864 0.1331
204.5 -1.9491 21.2425 0.1331
205.5 -1.9421 21.2984 0.1330
206.5 -1.9352 21.3540 0.1329
207.5 -1.9284 21.4094 0.1328
208.5 -1.9217 21.4646 0.1327
209.5 -1.9152 21.5195 0.1327
210.5 -1.9088 21.5742 0.1326
211.5 -1.9026 21.6285 0.1325
212.5 -1.8966 21.6826 0.1325
213.5 -1.8908 21.7364 0.1324
214.5 -1.8852 21.7899 0.1324
215.5 -1.8798 21.8430 0.1323
216.5 -1.8747 21.8959 0.1323
217.5 -1.8698 21.9484 0.1323
218.5 -1.8651 22.0005 0.1322
219.5 -1.8607 22.0523 0.1322
220.5 -1.8566 22.1037 0.1322
221.5 -1.8528 22.1548 0.1322
222.5 -1.8493 22.2054 0.1322
223.5 -1.8461 22.2557 0.1323
224.5 -1.8433 22.3055 0.1323
225.5 -1.8407 22.3550 0.1324
226.5 -1.8385 22.4040 0.1324
227.5 -1.8367 22.4526 0.1325
228.5 -1.8351 22.5007 0.1326
229.5 -1.8340 22.5484 0.1327
230.5 -1.8332 22.5957 0.1328
231.5 -1.8327 22.6424 0.1329
232.5 -1.8326 22.6887 0.1330
233.5 -1.8328 22.7346 0.1332
234.5 -1.8334 22.7799 0.1333
235.5 -1.8343 22.8247 0.1335
236.5 -1.8356 22.8691 0.1337
237.5 -1.8371 22.9129 0.1339
238.5 -1.8390 22.9563 0.1342
239.5 -1.8411 22.9991 0.1344
240 -1.8423 23.0203 0.1345
240.5 -1.8436 23.0414 0.1347

 

 LMS table: Normal table percentiles for Z-score

 
Z 1 3 5 7 9
-3.0 0.13% 0.12% 0.11% 0.11% 0.10%
-2.9 0.18% 0.17% 0.16% 0.15% 0.14%
-2.8 0.25% 0.23% 0.22% 0.21% 0.19%
-2.7 0.34% 0.32% 0.30% 0.28% 0.26%
-2.6 0.45% 0.43% 0.40% 0.38% 0.36%
-2.5 0.60% 0.57% 0.54% 0.51% 0.48%
-2.4 0.80% 0.75% 0.71% 0.68% 0.64%
-2.3 1.04% 0.99% 0.94% 0.89% 0.84%
-2.2 1.36% 1.29% 1.22% 1.16% 1.10%
-2.1 1.74% 1.66% 1.58% 1.50% 1.43%
-2.0 2.22% 2.12% 2.02% 1.92% 1.83%
-1.9 2.81% 2.68% 2.56% 2.44% 2.33%
-1.8 3.52% 3.36% 3.22% 3.07% 2.94%
-1.7 4.36% 4.18% 4.01% 3.84% 3.67%
-1.6 5.37% 5.16% 4.95% 4.75% 4.55%
-1.5 6.55% 6.30% 6.06% 5.82% 5.59%
-1.4 7.93% 7.64% 7.35% 7.08% 6.81%
-1.3 9.51% 9.18% 8.85% 8.53% 8.23%
-1.2 11.31% 10.94% 10.57% 10.20% 9.85%
-1.1 13.35% 12.92% 12.51% 12.10% 11.70%
-1.0 15.63% 15.15% 14.69% 14.23% 13.79%
-0.9 18.14% 17.62% 17.11% 16.60% 16.11%
-0.8 20.90% 20.33% 19.77% 19.22% 18.67%
-0.7 23.89% 23.27% 22.66% 22.07% 21.48%
-0.6 27.09% 26.44% 25.79% 25.14% 24.51%
-0.5 30.50% 29.81% 29.12% 28.43% 27.76%
-0.4 34.09% 33.36% 32.64% 31.92% 31.21%
-0.3 37.83% 37.07% 36.32% 35.57% 34.83%
-0.2 41.68% 40.91% 40.13% 39.36% 38.59%
-0.1 45.62% 44.83% 44.04% 43.25% 42.47%
-0.0 49.60% 48.80% 48.01% 47.21% 46.41%
0.0 50.40% 51.20% 51.99% 52.79% 53.59%
0.1 54.38% 55.17% 55.96% 56.75% 57.54%
0.2 58.32% 59.10% 59.87% 60.64% 61.41%
0.3 62.17% 62.93% 63.68% 64.43% 65.17%
0.4 65.91% 66.64% 67.36% 68.08% 68.79%
0.5 69.50% 70.19% 70.88% 71.57% 72.24%
0.6 72.91% 73.57% 74.22% 74.86% 75.49%
0.7 76.12% 76.73% 77.34% 77.94% 78.52%
0.8 79.10% 79.67% 80.23% 80.79% 81.33%
0.9 81.86% 82.38% 82.89% 83.40% 83.89%
1.0 84.38% 84.85% 85.31% 85.77% 86.21%
1.1 86.65% 87.08% 87.49% 87.90% 88.30%
1.2 88.69% 89.07% 89.44% 89.80% 90.15%
1.3 90.49% 90.82% 91.15% 91.47% 91.77%
1.4 92.07% 92.36% 92.65% 92.92% 93.19%
1.5 93.45% 93.70% 93.94% 94.18% 94.41%
1.6 94.63% 94.85% 95.05% 95.25% 95.45%
1.7 95.64% 95.82% 95.99% 96.16% 96.33%
1.8 96.49% 96.64% 96.78% 96.93% 97.06%
1.9 97.19% 97.32% 97.44% 97.56% 97.67%
2.0 97.78% 97.88% 97.98% 98.08% 98.17%
2.1 98.26% 98.34% 98.42% 98.50% 98.57%
2.2 98.65% 98.71% 98.78% 98.84% 98.90%
2.3 98.96% 99.01% 99.06% 99.11% 99.16%
2.4 99.20% 99.25% 99.29% 99.32% 99.36%
2.5 99.40% 99.43% 99.46% 99.49% 99.52%
2.6 99.55% 99.57% 99.60% 99.62% 99.64%
2.7 99.66% 99.68% 99.70% 99.72% 99.74%
2.8 99.75% 99.77% 99.78% 99.80% 99.81%
2.9 99.82% 99.83% 99.84% 99.85% 99.86%
3.0 99.87% 99.88% 99.89% 99.89% 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 13412 Version 20.0