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


 Calculator: Body mass index (BMI) percentiles and Z-scores, females 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, females 2 to 20 years, CDC growth reference (United States)

 
Age [months] Power [L] Median [M] Variation [S]
24 -0.9866 16.4234 0.0855
24.5 -1.0245 16.3880 0.0850
25.5 -1.1027 16.3190 0.0842
26.5 -1.1840 16.2521 0.0835
27.5 -1.2681 16.1873 0.0827
28.5 -1.3548 16.1248 0.0821
29.5 -1.4437 16.0643 0.0815
30.5 -1.5345 16.0059 0.0809
31.5 -1.6269 15.9497 0.0804
32.5 -1.7204 15.8955 0.0800
33.5 -1.8146 15.8434 0.0796
34.5 -1.9091 15.7933 0.0792
35.5 -2.0033 15.7453 0.0789
36.5 -2.0968 15.6992 0.0786
37.5 -2.1892 15.6552 0.0784
38.5 -2.2800 15.6132 0.0782
39.5 -2.3687 15.5732 0.0781
40.5 -2.4550 15.5351 0.0780
41.5 -2.5385 15.4989 0.0779
42.5 -2.6187 15.4647 0.0779
43.5 -2.6955 15.4324 0.0779
44.5 -2.7685 15.4019 0.0780
45.5 -2.8374 15.3734 0.0781
46.5 -2.9022 15.3466 0.0783
47.5 -2.9626 15.3217 0.0785
48.5 -3.0185 15.2985 0.0787
49.5 -3.0699 15.2772 0.0790
50.5 -3.1168 15.2576 0.0793
51.5 -3.1591 15.2397 0.0796
52.5 -3.1969 15.2235 0.0800
53.5 -3.2303 15.2089 0.0805
54.5 -3.2593 15.1961 0.0809
55.5 -3.2841 15.1848 0.0814
56.5 -3.3048 15.1751 0.0819
57.5 -3.3216 15.1670 0.0825
58.5 -3.3346 15.1605 0.0830
59.5 -3.3440 15.1554 0.0837
60.5 -3.3501 15.1519 0.0843
61.5 -3.3529 15.1498 0.0850
62.5 -3.3527 15.1492 0.0857
63.5 -3.3497 15.1499 0.0864
64.5 -3.3440 15.1521 0.0871
65.5 -3.3359 15.1557 0.0879
66.5 -3.3255 15.1606 0.0887
67.5 -3.3131 15.1668 0.0895
68.5 -3.2987 15.1743 0.0903
69.5 -3.2827 15.1831 0.0912
70.5 -3.2650 15.1931 0.0920
71.5 -3.2459 15.2044 0.0929
72.5 -3.2256 15.2169 0.0938
73.5 -3.2041 15.2306 0.0947
74.5 -3.1817 15.2454 0.0956
75.5 -3.1584 15.2614 0.0966
76.5 -3.1343 15.2785 0.0975
77.5 -3.1096 15.2968 0.0985
78.5 -3.0843 15.3161 0.0994
79.5 -3.0586 15.3364 0.1004
80.5 -3.0325 15.3579 0.1014
81.5 -3.0062 15.3803 0.1024
82.5 -2.9796 15.4037 0.1033
83.5 -2.9529 15.4282 0.1043
84.5 -2.9262 15.4536 0.1053
85.5 -2.8994 15.4799 0.1063
86.5 -2.8727 15.5072 0.1073
87.5 -2.8461 15.5354 0.1083
88.5 -2.8197 15.5644 0.1093
89.5 -2.7934 15.5944 0.1103
90.5 -2.7673 15.6252 0.1113
91.5 -2.7415 15.6568 0.1123
92.5 -2.7160 15.6893 0.1133
93.5 -2.6908 15.7226 0.1142
94.5 -2.6659 15.7566 0.1152
95.5 -2.6413 15.7914 0.1162
96.5 -2.6172 15.8270 0.1172
97.5 -2.5934 15.8633 0.1181
98.5 -2.5701 15.9003 0.1191
99.5 -2.5471 15.9380 0.1200
100.5 -2.5246 15.9764 0.1209
101.5 -2.5026 16.0155 0.1219
102.5 -2.4810 16.0552 0.1228
103.5 -2.4598 16.0955 0.1237
104.5 -2.4391 16.1365 0.1246
105.5 -2.4188 16.1780 0.1254
106.5 -2.3991 16.2201 0.1263
107.5 -2.3798 16.2628 0.1272
108.5 -2.3609 16.3061 0.1280
109.5 -2.3426 16.3499 0.1288
110.5 -2.3247 16.3942 0.1297
111.5 -2.3072 16.4390 0.1305
112.5 -2.2903 16.4843 0.1313
113.5 -2.2738 16.5300 0.1320
114.5 -2.2578 16.5763 0.1328
115.5 -2.2422 16.6229 0.1335
116.5 -2.2271 16.6700 0.1343
117.5 -2.2125 16.7175 0.1350
118.5 -2.1983 16.7654 0.1357
119.5 -2.1846 16.8137 0.1364
120.5 -2.1713 16.8623 0.1371
121.5 -2.1585 16.9113 0.1377
122.5 -2.1461 16.9606 0.1384
123.5 -2.1341 17.0103 0.1390
124.5 -2.1225 17.0602 0.1396
125.5 -2.1114 17.1105 0.1402
126.5 -2.1007 17.1610 0.1408
127.5 -2.0905 17.2117 0.1413
128.5 -2.0806 17.2628 0.1419
129.5 -2.0712 17.3140 0.1424
130.5 -2.0621 17.3655 0.1429
131.5 -2.0535 17.4172 0.1434
132.5 -2.0452 17.4691 0.1439
133.5 -2.0374 17.5211 0.1443
134.5 -2.0299 17.5733 0.1448
135.5 -2.0228 17.6257 0.1452
136.5 -2.0161 17.6782 0.1456
137.5 -2.0098 17.7308 0.1460
138.5 -2.0038 17.7836 0.1464
139.5 -1.9982 17.8364 0.1468
140.5 -1.9930 17.8893 0.1471
141.5 -1.9881 17.9423 0.1474
142.5 -1.9835 17.9953 0.1478
143.5 -1.9794 18.0484 0.1481
144.5 -1.9755 18.1015 0.1484
145.5 -1.9720 18.1546 0.1486
146.5 -1.9689 18.2077 0.1489
147.5 -1.9660 18.2609 0.1491
148.5 -1.9635 18.3139 0.1494
149.5 -1.9614 18.3670 0.1496
150.5 -1.9595 18.4200 0.1498
151.5 -1.9580 18.4730 0.1500
152.5 -1.9568 18.5259 0.1501
153.5 -1.9559 18.5787 0.1503
154.5 -1.9553 18.6314 0.1505
155.5 -1.9550 18.6840 0.1506
156.5 -1.9550 18.7364 0.1507
157.5 -1.9553 18.7888 0.1508
158.5 -1.9559 18.8410 0.1509
159.5 -1.9568 18.8930 0.1510
160.5 -1.9579 18.9449 0.1511
161.5 -1.9594 18.9966 0.1511
162.5 -1.9611 19.0481 0.1512
163.5 -1.9631 19.0994 0.1512
164.5 -1.9654 19.1505 0.1512
165.5 -1.9679 19.2014 0.1513
166.5 -1.9707 19.2520 0.1513
167.5 -1.9738 19.3024 0.1513
168.5 -1.9771 19.3526 0.1513
169.5 -1.9806 19.4024 0.1512
170.5 -1.9844 19.4520 0.1512
171.5 -1.9885 19.5014 0.1512
172.5 -1.9928 19.5504 0.1511
173.5 -1.9973 19.5991 0.1511
174.5 -2.0020 19.6475 0.1510
175.5 -2.0070 19.6955 0.1509
176.5 -2.0121 19.7432 0.1509
177.5 -2.0175 19.7906 0.1508
178.5 -2.0231 19.8376 0.1507
179.5 -2.0289 19.8843 0.1506
180.5 -2.0349 19.9306 0.1505
181.5 -2.0411 19.9765 0.1504
182.5 -2.0474 20.0220 0.1503
183.5 -2.0539 20.0670 0.1502
184.5 -2.0606 20.1117 0.1501
185.5 -2.0675 20.1560 0.1500
186.5 -2.0745 20.1998 0.1498
187.5 -2.0816 20.2432 0.1497
188.5 -2.0889 20.2861 0.1496
189.5 -2.0963 20.3286 0.1495
190.5 -2.1038 20.3706 0.1493
191.5 -2.1114 20.4122 0.1492
192.5 -2.1192 20.4533 0.1491
193.5 -2.1270 20.4938 0.1490
194.5 -2.1349 20.5339 0.1488
195.5 -2.1428 20.5735 0.1487
196.5 -2.1509 20.6126 0.1486
197.5 -2.1589 20.6511 0.1485
198.5 -2.1670 20.6891 0.1483
199.5 -2.1752 20.7266 0.1482
200.5 -2.1833 20.7636 0.1481
201.5 -2.1915 20.7999 0.1480
202.5 -2.1996 20.8358 0.1479
203.5 -2.2077 20.8711 0.1478
204.5 -2.2157 20.9058 0.1477
205.5 -2.2237 20.9399 0.1476
206.5 -2.2317 20.9734 0.1476
207.5 -2.2395 21.0064 0.1475
208.5 -2.2473 21.0387 0.1474
209.5 -2.2549 21.0705 0.1474
210.5 -2.2624 21.1016 0.1473
211.5 -2.2697 21.1322 0.1473
212.5 -2.2769 21.1621 0.1473
213.5 -2.2839 21.1913 0.1472
214.5 -2.2907 21.2200 0.1472
215.5 -2.2973 21.2480 0.1472
216.5 -2.3037 21.2753 0.1473
217.5 -2.3098 21.3020 0.1473
218.5 -2.3157 21.3281 0.1473
219.5 -2.3212 21.3534 0.1474
220.5 -2.3265 21.3781 0.1475
221.5 -2.3314 21.4021 0.1476
222.5 -2.3360 21.4255 0.1477
223.5 -2.3403 21.4481 0.1478
224.5 -2.3442 21.4701 0.1480
225.5 -2.3477 21.4913 0.1481
226.5 -2.3508 21.5119 0.1483
227.5 -2.3534 21.5317 0.1485
228.5 -2.3557 21.5508 0.1487
229.5 -2.3575 21.5692 0.1490
230.5 -2.3588 21.5869 0.1492
231.5 -2.3596 21.6038 0.1495
232.5 -2.3599 21.6200 0.1498
233.5 -2.3597 21.6354 0.1502
234.5 -2.3590 21.6501 0.1505
235.5 -2.3577 21.6640 0.1509
236.5 -2.3559 21.6771 0.1513
237.5 -2.3535 21.6895 0.1518
238.5 -2.3505 21.7011 0.1522
239.5 -2.3470 21.7119 0.1527
240 -2.3450 21.7170 0.1530
240.5 -2.3428 21.7219 0.1532

 

 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 13415 Version 18.0