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Calculator: Body mass index (BMI) percentiles for females (2 to 20 years)


Calculator: Body mass index (BMI) percentiles for females (2 to 20 years)

 
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
  • 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.
  • 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
 
BMI = Weight / (Height/100)2
Age_Months = Age * 12
Z-score = ((BMI/M)L - 1) / (L * S)
Percentile = ZtoPercentile(Z-score)
BMI_95th_Percentile = M * ((L*S*1.645)+1)(1/L)

 

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

 

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

 
Age [months] Power [L] Median [M] Variation [S]
24.5 -1.024496827 16.38804056 0.085025838
25.5 -1.102698353 16.3189719 0.084214052
26.5 -1.18396635 16.25207985 0.083455124
27.5 -1.268071036 16.18734669 0.082748284
28.5 -1.354751525 16.12475448 0.082092737
29.5 -1.443689692 16.06428762 0.081487717
30.5 -1.53454192 16.00593001 0.080932448
31.5 -1.626928093 15.94966631 0.080426175
32.5 -1.720434829 15.89548197 0.079968176
33.5 -1.814635262 15.84336179 0.079557735
34.5 -1.909076262 15.79329146 0.079194187
35.5 -2.003296102 15.7452564 0.078876895
36.5 -2.096828937 15.69924188 0.078605255
37.5 -2.189211877 15.65523282 0.078378696
38.5 -2.279991982 15.61321371 0.078196674
39.5 -2.368732949 15.57316843 0.078058667
40.5 -2.455021314 15.53508019 0.077964169
41.5 -2.538471972 15.49893145 0.077912684
42.5 -2.618732901 15.46470384 0.077903716
43.5 -2.695488973 15.43237817 0.077936763
44.5 -2.768464816 15.40193436 0.078011309
45.5 -2.837426693 15.37335154 0.078126817
46.5 -2.902178205 15.34660842 0.078282739
47.5 -2.962580386 15.32168181 0.078478449
48.5 -3.018521987 15.29854897 0.078713325
49.5 -3.069936555 15.27718618 0.078986694
50.5 -3.116795864 15.2575692 0.079297841
51.5 -3.159107331 15.23967338 0.079646006
52.5 -3.196911083 15.22347371 0.080030389
53.5 -3.230276759 15.20894491 0.080450145
54.5 -3.259300182 15.19606152 0.080904391
55.5 -3.284099963 15.18479799 0.081392203
56.5 -3.30481415 15.17512871 0.081912623
57.5 -3.321596954 15.16702811 0.082464661
58.5 -3.334615646 15.16047068 0.083047295
59.5 -3.344047622 15.15543107 0.083659478
60.5 -3.35007771 15.15188405 0.084300139
61.5 -3.352893805 15.14980479 0.0849682
62.5 -3.352691376 15.14916825 0.085662539
63.5 -3.34966438 15.14994984 0.086382035
64.5 -3.343998803 15.15212585 0.087125591
65.5 -3.335889574 15.15567186 0.087892047
66.5 -3.325522491 15.16056419 0.088680264
67.5 -3.31307846 15.16677947 0.089489106
68.5 -3.298732648 15.17429464 0.090317434
69.5 -3.282653831 15.18308694 0.091164117
70.5 -3.265003896 15.1931339 0.092028028
71.5 -3.245937506 15.20441335 0.092908048
72.5 -3.225606516 15.21690296 0.093803033
73.5 -3.204146115 15.2305815 0.094711916
74.5 -3.181690237 15.24542745 0.095633595
75.5 -3.158363475 15.26141966 0.096566992
76.5 -3.134282833 15.27853728 0.097511046
77.5 -3.109557879 15.29675967 0.09846471
78.5 -3.084290931 15.31606644 0.099426955
79.5 -3.058577292 15.33643745 0.100396769
80.5 -3.032505499 15.35785274 0.101373159
81.5 -3.0061576 15.38029261 0.10235515
82.5 -2.979609448 15.40373754 0.103341788
83.5 -2.952930993 15.42816819 0.104332139
84.5 -2.926186592 15.45356545 0.105325289
85.5 -2.899435307 15.47991037 0.106320346
86.5 -2.872731211 15.50718419 0.10731644
87.5 -2.846123683 15.53536829 0.108312721
88.5 -2.819657704 15.56444426 0.109308364
89.5 -2.793374145 15.5943938 0.110302563
90.5 -2.767310047 15.6251988 0.111294537
91.5 -2.741498897 15.65684126 0.112283526
92.5 -2.715970894 15.68930333 0.113268793
93.5 -2.690753197 15.7225673 0.114249622
94.5 -2.665870146 15.75661555 0.115225321
95.5 -2.641343436 15.79143062 0.116195218
96.5 -2.617192204 15.82699517 0.117158667
97.5 -2.593430614 15.86329241 0.118115073
98.5 -2.570076037 15.90030484 0.119063807
99.5 -2.547141473 15.93801545 0.12000429
100.5 -2.524635245 15.97640787 0.120935994
101.5 -2.502569666 16.01546483 0.121858355
102.5 -2.48095189 16.05516984 0.12277087
103.5 -2.459785573 16.09550688 0.123673085
104.5 -2.439080117 16.13645881 0.124564484
105.5 -2.418838304 16.17800955 0.125444639
106.5 -2.399063683 16.22014281 0.126313121
107.5 -2.379756861 16.26284277 0.127169545
108.5 -2.360920527 16.30609316 0.128013515
109.5 -2.342557728 16.34987759 0.128844639
110.5 -2.324663326 16.39418118 0.129662637
111.5 -2.307240716 16.43898741 0.130467138
112.5 -2.290287663 16.48428082 0.131257852
113.5 -2.273803847 16.53004554 0.132034479
114.5 -2.257782149 16.57626713 0.132796819
115.5 -2.242227723 16.62292864 0.133544525
116.5 -2.227132805 16.67001572 0.134277436
117.5 -2.212495585 16.71751288 0.134995324
118.5 -2.19831275 16.76540496 0.135697996
119.5 -2.184580762 16.81367689 0.136385276
120.5 -2.171295888 16.86231366 0.137057004
121.5 -2.158454232 16.91130036 0.137713039
122.5 -2.146051754 16.96062216 0.138353254
123.5 -2.134084303 17.0102643 0.138977537
124.5 -2.122547629 17.06021213 0.139585795
125.5 -2.111437411 17.11045106 0.140177947
126.5 -2.100749266 17.16096656 0.140753927
127.5 -2.090478774 17.21174424 0.141313686
128.5 -2.080621484 17.26276973 0.141857186
129.5 -2.071172932 17.31402878 0.142384404
130.5 -2.062128649 17.3655072 0.142895332
131.5 -2.053484173 17.4171909 0.143389972
132.5 -2.045235058 17.46906585 0.143868341
133.5 -2.03737688 17.52111811 0.144330469
134.5 -2.029906684 17.57333347 0.144776372
135.5 -2.022817914 17.62569869 0.145206138
136.5 -2.016107084 17.67819987 0.145619819
137.5 -2.009769905 17.7308234 0.146017491
138.5 -2.003802134 17.78355575 0.146399239
139.5 -1.998199572 17.83638347 0.146765161
140.5 -1.992958064 17.88929321 0.147115364
141.5 -1.988073505 17.94227168 0.147449967
142.5 -1.983541835 17.9953057 0.147769097
143.5 -1.979359041 18.04838216 0.148072891
144.5 -1.975521156 18.10148804 0.148361495
145.5 -1.972024258 18.15461039 0.148635067
146.5 -1.968864465 18.20773639 0.148893769
147.5 -1.966037938 18.26085325 0.149137776
148.5 -1.963540872 18.31394832 0.14936727
149.5 -1.961369499 18.36700902 0.149582439
150.5 -1.959520079 18.42002284 0.149783482
151.5 -1.9579889 18.47297739 0.149970604
152.5 -1.956772271 18.52586035 0.15014402
153.5 -1.95586652 18.57865951 0.15030395
154.5 -1.955267984 18.63136275 0.150450621
155.5 -1.954973011 18.68395801 0.15058427
156.5 -1.954977947 18.73643338 0.150705138
157.5 -1.955279136 18.788777 0.150813475
158.5 -1.955872909 18.84097713 0.150909535
159.5 -1.956755579 18.89302212 0.150993582
160.5 -1.957923436 18.94490041 0.151065883
161.5 -1.959372737 18.99660055 0.151126714
162.5 -1.9610997 19.04811118 0.151176355
163.5 -1.963100496 19.09942105 0.151215094
164.5 -1.96537124 19.15051899 0.151243223
165.5 -1.967907983 19.20139397 0.151261042
166.5 -1.970706706 19.25203503 0.151268855
167.5 -1.973763307 19.30243131 0.151266974
168.5 -1.977073595 19.35257209 0.151255713
169.5 -1.980633277 19.40244671 0.151235395
170.5 -1.984437954 19.45204465 0.151206347
171.5 -1.988483106 19.50135548 0.151168902
172.5 -1.992764085 19.55036888 0.151123398
173.5 -1.997276103 19.59907464 0.15107018
174.5 -2.002014224 19.64746266 0.151009595
175.5 -2.00697335 19.69552294 0.150942
176.5 -2.012148213 19.7432456 0.150867753
177.5 -2.017533363 19.79062086 0.150787221
178.5 -2.023123159 19.83763907 0.150700774
179.5 -2.028911755 19.88429066 0.150608788
180.5 -2.034893091 19.9305662 0.150511645
181.5 -2.041060881 19.97645636 0.150409731
182.5 -2.047408604 20.02195192 0.15030344
183.5 -2.05392949 20.06704377 0.150193169
184.5 -2.060616513 20.11172291 0.150079322
185.5 -2.067462375 20.15598047 0.149962308
186.5 -2.074459502 20.19980767 0.14984254
187.5 -2.081600029 20.24319586 0.149720441
188.5 -2.088875793 20.28613648 0.149596434
189.5 -2.096278323 20.32862109 0.149470953
190.5 -2.103798828 20.37064138 0.149344433
191.5 -2.111428194 20.41218911 0.149217319
192.5 -2.119156972 20.45325617 0.14909006
193.5 -2.126975375 20.49383457 0.14896311
194.5 -2.134873266 20.5339164 0.148836931
195.5 -2.142840157 20.57349387 0.148711989
196.5 -2.150865204 20.61255929 0.148588757
197.5 -2.158937201 20.65110506 0.148467715
198.5 -2.167044578 20.6891237 0.148349348
199.5 -2.175176987 20.72660728 0.14823412
200.5 -2.183317362 20.76355011 0.148122614
201.5 -2.191457792 20.79994337 0.148015249
202.5 -2.199583649 20.83578051 0.147912564
203.5 -2.207681525 20.87105449 0.147815078
204.5 -2.215737645 20.90575839 0.147723315
205.5 -2.223739902 20.93988477 0.147637768
206.5 -2.231667995 20.97342858 0.147559083
207.5 -2.239511942 21.00638171 0.147487716
208.5 -2.247257081 21.0387374 0.14742421
209.5 -2.254885145 21.07048996 0.147369174
210.5 -2.26238209 21.10163241 0.147323144
211.5 -2.269731517 21.13215845 0.147286698
212.5 -2.276917229 21.16206171 0.147260415
213.5 -2.283925442 21.1913351 0.147244828
214.5 -2.290731442 21.21997472 0.147240683
215.5 -2.29732427 21.24797262 0.147248467
216.5 -2.303687802 21.27532239 0.14726877
217.5 -2.309799971 21.30201933 0.147302299
218.5 -2.315651874 21.32805489 0.147349514
219.5 -2.32121731 21.35342563 0.147411215
220.5 -2.326481911 21.37812462 0.147487979
221.5 -2.331428139 21.40214589 0.147580453
222.5 -2.336038473 21.42548351 0.147689289
223.5 -2.34029545 21.44813156 0.14781515
224.5 -2.344181703 21.47008412 0.147958706
225.5 -2.34768 21.49133529 0.148120633
226.5 -2.350773286 21.51187918 0.148301619
227.5 -2.353444725 21.53170989 0.148502355
228.5 -2.355677743 21.55082155 0.148723546
229.5 -2.35745607 21.56920824 0.148965902
230.5 -2.358763788 21.58686406 0.149230142
231.5 -2.359585369 21.60378309 0.149516994
232.5 -2.359905726 21.61995939 0.149827195
233.5 -2.359710258 21.635387 0.150161492
234.5 -2.358980464 21.65006126 0.150520734
235.5 -2.357714508 21.6639727 0.150905439
236.5 -2.355892424 21.67711736 0.151316531
237.5 -2.353501353 21.68948935 0.151754808
238.5 -2.350528726 21.70108288 0.152221086
239.5 -2.346962247 21.71189225 0.152716206
240.5 -2.342796948 21.72190973 0.153240872

 

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 13415 Version 13.0