arm circumference percentile tables — WHO, CDC, UK90 compared

arm circumference medians from every standard here, side by side month by month — a column no source document prints. Full P3–P97 tables, CSV and JSON.

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boy

This column only exists when you put the standards side by side. A blank means that standard does not reach that age.

Medians (P50) compared（cm）
Age	Japan	Republic of Korea	United Kingdom	United States	World Health Organization
3 months	13.5	13.5	13.5	13.5	13.5
4 months	13.8	13.8	13.8	13.8	13.8
5 months	14.1	14.1	14.1	14.1	14.1
6 months	14.2	14.2	14.2	14.2	14.2
7 months	14.4	14.4	14.4	14.4	14.4
8 months	14.5	14.5	14.5	14.5	14.5
9 months	14.5	14.5	14.5	14.5	14.5
10 months	14.6	14.6	14.6	14.6	14.6
11 months	14.6	14.6	14.6	14.6	14.6
12 months	14.6	14.6	14.6	14.6	14.6
13 months	14.7	14.7	14.7	14.7	14.7
14 months	14.7	14.7	14.7	14.7	14.7
15 months	14.7	14.7	14.7	14.7	14.7
16 months	14.8	14.8	14.8	14.8	14.8
17 months	14.8	14.8	14.8	14.8	14.8
18 months	14.8	14.8	14.8	14.8	14.8
19 months	14.9	14.9	14.9	14.9	14.9
20 months	14.9	14.9	14.9	14.9	14.9
21 months	15.0	15.0	15.0	15.0	15.0
22 months	15.0	15.0	15.0	15.0	15.0
23 months	15.1	15.1	15.1	15.1	15.1
2 years	15.2	15.2	15.2	—	15.2
2y 3m	15.3	15.3	15.3	—	15.3
2y 6m	15.5	15.5	15.5	—	15.5
2y 9m	15.6	15.6	15.6	—	15.6
3 years	15.7	15.7	15.7	—	15.7
3y 3m	15.8	15.8	15.8	—	15.8
3y 6m	15.9	15.9	15.9	—	15.9
3y 9m	16.0	16.0	16.0	—	16.0
4 years	16.1	16.1	—	—	16.1
4y 3m	16.2	16.2	—	—	16.2
4y 6m	16.3	16.3	—	—	16.3
4y 9m	16.4	16.4	—	—	16.4
5 years	16.5	16.5	—	—	16.5

girl

This column only exists when you put the standards side by side. A blank means that standard does not reach that age.

Medians (P50) compared（cm）
Age	Japan	Republic of Korea	United Kingdom	United States	World Health Organization
3 months	13.0	13.0	13.0	13.0	13.0
4 months	13.4	13.4	13.4	13.4	13.4
5 months	13.6	13.6	13.6	13.6	13.6
6 months	13.8	13.8	13.8	13.8	13.8
7 months	13.9	13.9	13.9	13.9	13.9
8 months	14.0	14.0	14.0	14.0	14.0
9 months	14.1	14.1	14.1	14.1	14.1
10 months	14.1	14.1	14.1	14.1	14.1
11 months	14.2	14.2	14.2	14.2	14.2
12 months	14.2	14.2	14.2	14.2	14.2
13 months	14.2	14.2	14.2	14.2	14.2
14 months	14.3	14.3	14.3	14.3	14.3
15 months	14.3	14.3	14.3	14.3	14.3
16 months	14.4	14.4	14.4	14.4	14.4
17 months	14.4	14.4	14.4	14.4	14.4
18 months	14.5	14.5	14.5	14.5	14.5
19 months	14.5	14.5	14.5	14.5	14.5
20 months	14.6	14.6	14.6	14.6	14.6
21 months	14.7	14.7	14.7	14.7	14.7
22 months	14.7	14.7	14.7	14.7	14.7
23 months	14.8	14.8	14.8	14.8	14.8
2 years	14.9	14.9	14.9	—	14.9
2y 3m	15.1	15.1	15.1	—	15.1
2y 6m	15.3	15.3	15.3	—	15.3
2y 9m	15.5	15.5	15.5	—	15.5
3 years	15.6	15.6	15.6	—	15.6
3y 3m	15.8	15.8	15.8	—	15.8
3y 6m	16.0	16.0	16.0	—	16.0
3y 9m	16.1	16.1	16.1	—	16.1
4 years	16.2	16.2	—	—	16.2
4y 3m	16.4	16.4	—	—	16.4
4y 6m	16.6	16.6	—	—	16.6
4y 9m	16.7	16.7	—	—	16.7
5 years	16.9	16.9	—	—	16.9

To read one standard in full

Each standard’s own P3–P97 figures, its curves, and its own evaluation cut-offs are on its own page.

Provenance and use

WS/T 423—2022 (Growth standards for children under 7 years of age), issued by National Health Commission of China (国家卫生健康委员会) on 2022-09-19, effective 2023-03-01, replacing WS/T 423—2013. Built from 83,628 children in The fifth national survey of physical development in children under 7, across nine Chinese cities, 2015. The percentile tables used here are the ones in its Appendix A.

WHO Child Growth Standards (2006) · WHO Growth Reference (2007). The LMS parameters come from who.int; the figures here are computed from them and checked row by row against WHO’s own printed z-score tables.

For following a child over time, stay with one set of tables. Switching moves the position, and that is not the child changing.